Session Index

S4. Optical Information Processing and Holography

Optical Information Processing and Holography I
Friday, Dec. 1, 2023  13:00-15:00
Presider: Prof. Chau-Jern Cheng (National Taiwan Normal University, Taiwan) Prof. Cheng-Chih Hsu (National United University, Taiwan)
Room: 92185 (1F)
13:00 - 13:30
Manuscript ID.  0641
Paper No.  2023-FRI-S0401-I001
Invited Speaker:
Małgorzata Kujawińska
Holography based quantitative phase imaging: systems, data processing and metrological aspects in biomedical applications
Małgorzata Kujawińska, Warsaw University of Technology (Poland)

Label-free quantitative 3D phase imaging techniques are becoming increasingly important and popular in biological and medical applications for measurements and monitoring of cells, cell cultures and tissues. In particular, the possibility of the quantitative three-dimensional (3D) representation of living samples holds tremendous potential for advancing the field as it would provide unprecedented ease of insight into subtle intracellular mechanisms.

In this talk I will discuss the recent progress and trends in development and applications of 3D QPI systems based on optical diffraction tomography (ODT) with holographic projections. The presentation will focus on algorithms and systems which allow to overcome the most important issues such as: (i) lack of isotropic and sufficiently high spatial resolution essp. in the case of limited angle optical diffraction tomography(ODT), (ii) lack of the chemical specificity (general feature of QPI methods), (iii) multiple scattering which limits the size (thickness) of investigated samples (tissues, small scale objects) and (iv) lack of efficient solutions for in-vivo tissue investigations (such as in the case of optical coherence tomography (OCT)). The discussed solutions will include utilization of unified k-space theory of OCT which allows to provide an efficient use of combined OCT and ODT approaches, development of multimodal systems combining ODT with fluorescence microscopy and ODT with Raman spectroscopy, as well as applying AI solutions to support better reconstruction of biophysical parameters of cells and tissues.

However 3D QPI systems to be fully quantitative require proper metrological approach to assess the accuracy and precision of measurement. This problem is most often overlooked in both research and commercial QPI systems and there are no standardized methods for testing and reporting their metrological performance. Therefore I will also present the methodology for metrological evaluation of 3D QPI instruments for biomedical applications. The methodology entails suitable phantoms, quality assessment metric and easily reproducible protocol that is attainable for both numerical and experimental analysis. We demonstrate its applicability by comparing simulated and physical reconstructions obtained from 3 holographic tomography systems. The results will serve as a reference point for past and future research, encourage to benchmark new systems in a similar manner and further the efforts towards the standardization in 3D QPI metrology.

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13:30 - 13:45 Award Candidate (Paper Competition)
Manuscript ID.  0906
Paper No.  2023-FRI-S0401-O001
Shih-Hsiu Huang Metasurface-driven Snapshot Hyperspectral Imaging through Small-data Learning Theory
Shih-Hsiu Huang, Chia-Hsiang Lin, Ting-Hsuan Lin, Pin Chieh Wu, National Cheng Kung University (Taiwan)

Here, we propose a snapshot hyperspectral imaging system incorporated with the meta-optics concept and a small-data convex/deep (CODE) learning theory. Our hyperspectral imager contains only one single multi-wavelength metasurface chip, greatly reducing the physical size of device. To demonstrate the high performance of imaging system, a single-shot 4-band multispectral image is taken as the input. Consequently, a high-fidelity 18-band hyperspectral data cube is generated using the CODE-driven imaging system. We surmise that the metasurface-driven hyperspectral imaging combined with CODE small-data learning theory can pave a new way toward fundamental science studies and real-world applications with low-profile advanced instruments.

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13:45 - 14:00 Award Candidate (Paper Competition)
Manuscript ID.  1004
Paper No.  2023-FRI-S0401-O002
Chen-Ming Tsai Common-path digital holographic microscopy using a volume hologram
Chen-Ming Tsai, Yuan Luo, Sunil Vyas, National Taiwan University (Taiwan)

Digital holographic microscopy (DHM) is a useful quantitative phase imaging
technique for observing transparent samples. In DHM, the diffraction grating is a widely used
component to implement the common-path configuration which helps stabilize the system and
reduce environmental fluctuations. However, the multiple unwanted higher-order diffraction
beams of grating lead to the system power loss. Here, we proposed using the volume
hologram (VH) to satisfy the common-path DHM configuration. By utilizing the single
diffraction order characteristics of the volume hologram, our proposed setup enhances system
stability while maintaining system power usage.

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14:00 - 14:15 Award Candidate (Paper Competition)
Manuscript ID.  0734
Paper No.  2023-FRI-S0401-O003
Chia-Yu Ho Development of an Automated Electronic Connector Inspection System Based on Machine Vision
Chia-Yu Ho, Ju-Yi Lee, National Central University (Taiwan)

We have developed a machine vision-based Automated Optical Inspection (AOI) system capable of automatically detecting defects in small electronic connectors and marking them for subsequent processing. This advancement serves to enhance the objectivity and accuracy of the inspection process.

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14:15 - 14:30 Award Candidate (Paper Competition)
Manuscript ID.  1054
Paper No.  2023-FRI-S0401-O004
Chau Nguyen Hong Minh Geometric Phase Optical Elements Using Photo-aligned Liquid Crystal Cell
Chau Nguyen Hong Minh, Stefan Petrov, National Yang Ming Chiao Tung University (Taiwan); Vera Marinova, Bulgarian Academy of Sciences (Bulgaria), National Yang Ming Chiao Tung University (Taiwan); ShiuanHuei Lin, National Yang Ming Chiao Tung University (Taiwan)

In this paper, we demonstrate the fabrication of the Geometric Phase (GP) optical device in an nematic liquid crystal cell (NLC cell) by using photo-alignment technique with poly[1- [4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] azo-polymer (PAZO) as alignment layer. In experiments, GP grating optical element is fabricated and tested. The design principle, fabrication and characterization of GP devices are presented and discussed.

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14:30 - 14:45 Award Candidate (Paper Competition)
Manuscript ID.  0569
Paper No.  2023-FRI-S0401-O005
Santhoshi Rupa Gayatri Neralla Parallel Processing for Reducing the Time of Beam Steering of OPA’s Using Weighted Grouping 1D Search Algorithm Technique.
Santhoshi Rupa Gayatri Neralla, San-Liang Lee, National Taiwan University of Science and Technology (Taiwan)

For a periodic 64-channel optical phased array (OPA), we propose a novel approach combining the grouped phase error correction and beam steering with (n-1) stages and using 1D search algorithm with fixed and iterative weights. We leverage the power of parallel processing to reduce computation time significantly. The proposed method is 8-10 times faster while achieving results of 12.9-dB PSLL, 75% peak intensity with fixed weight, and 66% peak intensity, 15.68-dB PSLL for iterative weights.

  Preview abstract
14:45 - 15:00
Manuscript ID.  0687
Paper No.  2023-FRI-S0401-O006
Jui-Chi Lin Accurate Optical Constant Determination of Panax Ginseng and Panax Quinquefolius in Terahertz Regime
Jui-Chi Lin, National Research Institute of Chinese Medicine (Taiwan); Chia-Ming Mai, Institute of Electronic Engineering (Taiwan); Yu-Ting Lan, Wen-Tai Li, National Research Institute of Chinese Medicine (Taiwan); Shang-Hua Yang, Institute of Electronic Engineering (Taiwan)

The efficacy and safety of traditional Chinese medicines highly depend on the quality of raw materials and process of preparation. Researchers have drawn attention to terahertz spectroscopy, using non-destructive method to conduct compositional analysis of Chinese medicines through their fingerprint spectra. Due to varied experimental conditions and data processing models adopted by different labs, integrated THz spectral database have yet to be available, nor does the standard operational procedure. Herein, we focus on the establishment of a systematized procedure for THz-based material analysis, such technique can provide powerful and time-effective quality monitoring of various Chinese herbs and medicines.

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S4. Optical Information Processing and Holography

Poster Session I
Friday, Dec. 1, 2023  13:30-16:30
Room: Building of Electrical Engineering (電機系館) (B1)
Award Candidate (Paper Competition)
Manuscript ID.  0786
Paper No.  2023-FRI-P0401-P001
Jia-Yi Chen Deep learning in three-dimensional composite surface imaging
Jia-Yi Chen, National Taiwan Normal University (Taiwan); Han-Yen Tu, Chinese Culture University (Taiwan)

In this study, we propose a deep learning-based three-dimensional (3D) surface imaging method for specular and diffuse reflection composite surfaces. The proposed system combines artificial intelligence for 3D optical measurement integrated with digital holography and fringe projection technologies. 3D fusion by 3D segmentation and alignment for composite surfaces are driven by artificial intelligence processes. The experimental results show that the proposed method can achieve competitive performance on 3D surface imaging using the deep learning-based integrated coherent system.

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Award Candidate (Paper Competition)
Manuscript ID.  0231
Paper No.  2023-FRI-P0401-P002
Si-Wei Chen Registrable Face Recognition based on Human-incomprehensible Lensless Imaging System
Si-Wei Chen, Ya-Ti Chang Lee, Chieh-En Lee, Chung-Hao Tien, National Yang Ming Chiao Tung University (Taiwan)

We proposed a lensless encryption face recognition system based on deep learning. An amplitude-modulated mask is applied as an element for optical encryption. Then, a ResNet-50 architecture was trained to learn a well-structured representation space for the visual recognition task. This concept was validated by 10-class dataset with 90% sensitivity and 98% specificity, respectively. Such unconventional optic offers a variety of different possible setups.

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Award Candidate (Paper Competition)
Manuscript ID.  1043
Paper No.  2023-FRI-P0401-P003
Jai-Yi Chen Deep learning in three-dimensional composite surface imaging
Jai-Yi Chen, National Taiwan Normal University (Taiwan); Huai-Che Chu, Chinese Culture University (Taiwan), National Taiwan Normal University (Taiwan); Tzu-Hsiang Wei, Tzu-Hao Chou, Tsung-Yu Chen, National Taiwan Normal University (Taiwan); Han-Yen Tu, Chinese Culture University (Taiwan)

In this study, we propose a deep learning-based three-dimensional (3D) surface imaging method for specular and diffuse reflection composite surfaces. The proposed system combines artificial intelligence for 3D optical measurement integrated with digital holography and fringe projection technologies. 3D fusion by 3D segmentation and alignment for composite surfaces are driven by artificial intelligence processes. The experimental results show that the proposed method can achieve competitive performance on 3D surface imaging using the deep learning-based integrated coherent system.

  Preview abstract
Award Candidate (Paper Competition)
Manuscript ID.  0479
Paper No.  2023-FRI-P0401-P004
Zih Fan Chen, Shiuan Huei Lin, National Yang Ming Chiao Tung University (Taiwan); Vera Marinova, Bulgarian Academy of Science (Bulgaria), National Yang Ming Chiao Tung University (Taiwan); Ken Y. Hsu, National Yang Ming Chiao Tung University (Taiwan)

In this paper, we present a theoretical model for color breaking in a holographic-optical-element-based augmented reality (AR) display. The discussions about the design parameters of holographic optical elements (HOEs) for AR glasses, focusing on color uniformity as a function of the waveguide thickness, are conducted. This model can be used to evaluate the color breaking of a displayed white image from the user’s point of view. The simulation results show that color breaking occurs due to the limitations of pupil size and image shifting caused by the extended eye-box. Moreover, the thickness of the waveguide also causes uneven color distribution.

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Award Candidate (Paper Competition)
Manuscript ID.  0056
Paper No.  2023-FRI-P0401-P005
Fang-Yu Chang Light Derived Phase Modulator Based on Dye-doped Liquid Crystal Films
Fang-Yu Chang, Wen-Kai Lin, National Changhua University of Education (Taiwan); Shao-Kui Zhou, National Yang Ming Chiao Tung University (Taiwan); Wei-Chia Su, National Changhua University of Education (Taiwan)

This research introduces a light-derive phase modulator based on dye-doped liquid-crystal (DDLC) films with a single-side rubbed cell. By using different polarized beams to stimulate azo dye, the alignment of the liquid-crystal demonstrates a change. The characteristic is harnessed for recording and erasing information. This optical element can be likened to a reusable computer-generated hologram (CGH).

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Award Candidate (Paper Competition)
Manuscript ID.  0630
Paper No.  2023-FRI-P0401-P006
Sheng-Yuan Zhang Polymer-Dispersed Liquid Crystal Optical Devices Based on the 4D Printing of Photo-Polymerization
Sheng-Yuan Zhang, Hsi-Fu Shih, National Chung Hsing University (Taiwan)

The purpose of this study is to explore the integration of 3D printing of photo-polymerization with the polymer-dispersed liquid crystal (PDLC) technique to create 4D printing optical devices. The printed 3D elements, including Fresnel lenses and gratings, are combined with polymer-dispersed liquid crystals, which enable the printed 3D elements to possess the ability of varying light intensity and therefore exhibit the characteristics of 4D printing. This study demonstrates the possibility of simplifying the fabrication processes of
switchable optical devices, improving limitations of 3D printing, reducing production cost, enhancing manufacturing efficiency, and offering the potential of a new configuration of 4D printing.

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Award Candidate (Paper Competition)
Manuscript ID.  0738
Paper No.  2023-FRI-P0401-P007
Tung-Chen Chao 3D Coordinates Point Cloud Acquisition System Based on Inertial and Optical Displacement Sensors
Tung-Chen Chao, Hsi-Fu Shih, National Chung Hsing University (Taiwan)

This research is devoted to developing a portable and user-friendly 3D coordinates point cloud acquisition system that is cost-effective and resistant to external light interference. Unlike conventional techniques, this system is integrated with a single inertial measurement unit (IMU) and a planar optical displacement sensor for the 3D scanning. By measuring variations in tilt angles and displacement distances of the object, we can derive a rotation matrix that enables the conversion of a 2D displacement vector into a representation in 3D space. Finally, through the integration of minute coordinate variations for each dataset, the point cloud acquisition could be completed.

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Award Candidate (Paper Competition)
Manuscript ID.  0474
Paper No.  2023-FRI-P0401-P008
Pin-Rui Chen Uniforming the illuminance of a hologram printer by localized adapt modulation
Pin-Rui Chen, Hong-Yuan Sie, Jung-Ping Liu, Feng Chia University (Taiwan)

This study presents a method to improve the exposure uniformity of a hologram printer by using localized adapt modulation. By measuring the actual illumination of the projected light pattern, an adapt mask function, which can compensate the nonuniformity, is produced and incorporated into patterns to be displayed on the DMD. The results indicate that the uniformity of the projected light patterns is significantly improved.

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Award Candidate (Paper Competition)
Manuscript ID.  0850
Paper No.  2023-FRI-P0401-P009
Yao-Yu Fang Combining Otsu Binarization and Gray-scale value Accumulation for Object Detection
Yao-Yu Fang, Yu-Quan Yang, Jing-Feng Weng, National Chiayi University (Taiwan)

This paper combines Otsu's binarization and accumulated intensity values to detect the installation arrangement of aluminum plates. The installation arrangement was the one of the 2023 intelligent robot competition topic presented by CHENBRO CO. and SYNTEC TECHNOLOGY CO (real industry requirement). Otsu's binarization can reduce the brightness influence in the environment. The accumulated intensity values are designed for the installation arrangement. In the experiments re-build by our laboratory (avoid the problem of product confidentiality), compared to YOLOv8 with the 80 images and running time 3 hours, the proposed algorithm effectively uses one image and running time 5 minutes.

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Award Candidate (Paper Competition)
Manuscript ID.  0247
Paper No.  2023-FRI-P0401-P010
Ting-Shiuan Niu Air and Water Pollution Assessment with Intelligent Hyperspectral Imaging
Ting-Shiuan Niu, Cheng-Hao Hsiao, Hsiang-Chen Wang, 1. Department of Mechanical Engineering and Advanced Institute of Manufacturing with High tech Innovations (Taiwan)

This research focuses on spectral analysis and deep learning of air pollution images for PM2.5 and water quality images for BOD (Biochemical Oxygen Demand). A total of 150 air pollution images and 90 water pollution images were used for this study. These images were divided into training and testing datasets, and then fed into two neural network models for training. Finally, the accuracy of the model predictions was evaluated.

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Manuscript ID.  0755
Paper No.  2023-FRI-P0401-P011
Siao-Yu Chang Jian A method for reconstructing the surface color of an object
Siao-Yu Chang Jian, Sheng-Chun Hung, Jing-Heng Chen, Kun-Huang Chen, Feng Chia University (Taiwan)

In this paper, a method for reconstructing the surface color of an object was proposed. It is based on the R, G, and B projected technology, and color theory regulated by the CIE color system, so it has the merits of simple optical structure and convenient operation, and quick analysis. In the experiment, a coin was used to verify the feasibility of the method, and the surface color has a good effect of restoring.

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Manuscript ID.  0945
Paper No.  2023-FRI-P0401-P012
Pu-Yin Chang 3D surface measurements by coaxial fringe projection profilometry with short depth of field
Nai-Jen Cheng, Hsin-Jen Hsu, Pu-Yin Chang, National Kaohsiung University of Science and Technology (Taiwan); Wei-Hung Su, National Sun Yat-Sen University (Taiwan)

A 2D fringe pattern is designed and employed to perform 3D profile measurements by means of coaxial fringe projections and image acquisitions in short depth of field. To enhance the reliability and systematic accuracy, a signal processing algorithm is proposed as well. Accuracy of the retrieved 3D profile can be achieved in the order of sub-millimeters.

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S4. Optical Information Processing and Holography

Optical Information Processing and Holography II
Friday, Dec. 1, 2023  15:15-17:30
Presider: Prof. Kun-Huang Chen (Feng Chia University, Taiwan) Prof. Jiun-You Lin (National Changhua University of Education)
Room: 92185 (1F)
15:15 - 15:45
Manuscript ID.  0640
Paper No.  2023-FRI-S0402-I001
Invited Speaker:
George Barbastathis
On the use of physics-enhanced machine learning for computational imaging
George Barbastathis, Massachusetts Institute of Technology (USA)

15:45 - 16:00 Award Candidate (Paper Competition)
Manuscript ID.  0804
Paper No.  2023-FRI-S0402-O001
Yi-Hui Wang Simultaneous Estimation of Thickness and Optical Constant in Time Resolved Terahertz Spectroscopy
Yi-Hui Wang, Interdisciplinary Program of Electrical Engineering and Computer Science (Taiwan); Chia-Ming Mai, Institute of Electronic Engineering (Taiwan); Shang-Hua Yang, Interdisciplinary Program of Electrical Engineering and Computer Science (Taiwan), Institute of Electronic Engineering (Taiwan)

In this work, we propose an algorithm for simultaneous determination of optical constant and sample thickness in transmissive time-resolved terahertz spectroscopic measurements. Based on Fresnel equation and Fabry-Perot effect, we construct the transfer function of the unknown sample in terms of sample thickness and its optical constant. Through an iterative fitting procedure, one can come to the optimal results. Our results show that under certain reasonable restrictions, the derived outcomes are in good agreements with published results. Such formulation can be further expanded to multilayer structure, which may contribute to non-destructive characterization of functional devices and packaged ICs.

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16:00 - 16:15 Award Candidate (Paper Competition)
Manuscript ID.  1059
Paper No.  2023-FRI-S0402-O002
Pin-Duan Huang Study of the High-Speed Imaging Communication System
Pin-Duan Huang, Yeh-Wei Yu, Tsung-Hsun Yang, Ching-Cherng Sun, National Central University (Taiwan)

The recent surge in multimedia users and internet traffic has strained low data rate Radio Frequency (RF) systems. To meet the growing need for higher data rates, the transition from RF to optical domains is accelerating. Free Space Optical (FSO) communication stands out as a solution, offering robust bandwidth for wireless connectivity between remote locations. However, FSO systems face atmospheric challenges, which Adaptive Optics combats by real-time correction of turbulence-induced distortions. Signal interference is also addressed through Sparse Coding, reducing the number of patterns. Our team developed a coding method to ensure both signal quality and efficient information transmission.

  Preview abstract
16:15 - 16:30 Award Candidate (Paper Competition)
Manuscript ID.  0820
Paper No.  2023-FRI-S0402-O003
Ying-Hao Wang Investigation of Light-Emitting Diode Irradiation on Retinal Pigment Epithelial Cells Using Digital Holographic Microscopy
Ying-Hao Wang, Electro-Optical Engineering (Taiwan); Ching-Yao Huang, Optometry (Taiwan); Chau-Jern Cheng, Electro-Optical Engineering (Taiwan)

Light-emitting diodes (LEDs) are the lighting elements on computer, cell phone, and television screens. Understanding LED irradiation effects on the human eye is crucial to vision care. This study investigated the effect of LED (violet, blue and red) irradiation on human retinal pigment epithelial (RPE) cell line ARPE-19, which can be observed through digital holographic microscopy (DHM) to assess cell morphology. The experimental results on cell morphology and viability indicate that ARPE-19 cells were more harmful under exposure to violet and blue light, but not significantly changed with red light irradiation.

  Preview abstract
16:30 - 16:45 Award Candidate (Paper Competition)
Manuscript ID.  1056
Paper No.  2023-FRI-S0402-O004
Kai-Dong Hsu A facile fabrication route of poly(ethylene glycol phenyl ether acrylate photopolymers for holographic storage
Kai-Dong Hsu, Yun-hsiu Lee, Tzu-Chien Hsu, Wei-Hung Su, National Sun Yat-Sen University (Taiwan)

A volume holographic material based on the ethylene glycol phenyl ethyl arylate (EGPEA) monomers with various initiator concentrations in the host matrix PMMA is synthesized. The advantages of lowering the initiator concentration, including a rather short initiation time within few seconds and a sharp rising optical response, are demonstrated. For a polymer with a thickness of 190m and an illuminating power density of 2mW/cm2, a Bragg grating with the diffraction efficiency of 95% can be formed in 80 seconds.

  Preview abstract
16:45 - 17:00
Manuscript ID.  0728
Paper No.  2023-FRI-S0402-O005
Shao-Kui Zhou FOV Expanding in Scanning Computer-generated Hologram System Based on Holographic Combiner
Wen-Kai Lin, National Central University (Taiwan); Shao-Kui Zhou, National Changhua University of Education (Taiwan), National Yang Ming Chiao Tung University (Taiwan); Chun-Chia Chen, Hung-Hui Huang, National Changhua University of Education (Taiwan); Bor-Shyh Lin, National Yang Ming Chiao Tung University (Taiwan); Wei-Chia Su, National Changhua University of Education (Taiwan)

This study proposed a scanning computer-generated hologram (CGH) display system to increase the field of view (FOV). A holographic screen is utilized to achieve the see-through function. A scanning mirror is utilized to enlarge the FOV. The aberration caused by the holographic combiner is analyzed and corrected. In our case, we achieve 21 degrees horizontal FOV with 6.4 μm pixel size SLM. The eyebox is 5.8mm (horizontal) by 4.6mm (vertical) while the resolution of SLM is 1920 (horizontal) by 1080 (vertical).

  Preview abstract
17:00 - 17:15
Manuscript ID.  0688
Paper No.  2023-FRI-S0402-O006
Jing-Feng Weng Auto-focusing Algorithm by using Mask Slope Variations to distinguish Blemish from Smooth Surface Sample
Jing-Feng Weng, National Chiayi University (Taiwan)

This paper is developed, simplified, and optimized from [1] in order to distinguish the proposed focal curves of the blemish from the curves of the smooth-surface sample. In this paper, the novel idea presents calculating the number of slope variations in the image mask. By contrast, the traditional auto-focusing algorithms (such as Square gradient) are based on calculating the intensity gray-values in the image mask. These traditional algorithms are not suitable in the fringe cases of the smooth-surface sample containing the blemish. In the following experimental results, the proposed algorithm presented the high-effective results.

  Preview abstract
17:15 - 17:30
Manuscript ID.  0968
Paper No.  2023-FRI-S0402-O007
Jye-Yeu Lee Model Predictive Control-Based Adaptive Optics System with Deep Shack-Hartmann Wavefront Sensor
Wei-Shiuan Huang, Jye-Yeu Lee, Chia-Wei Hsu, Feng-Chun Hsu, Chun-Yu Lin, Shean-Jen Chen, National Yang Ming Chiao Tung University (Taiwan)

Model predictive control (MPC) predicts future events using current measurements and adjusts control processes accordingly. In our adaptive optics system (AOS), we integrate U-Net with Shack-Hartmann wavefront sensor (SHWS) propose a deep learning (DL) method to reconstruct the wavefront. This DL-SHWS is integrated into the MPC controller, effectively correcting wavefront aberrations in simulations and enhancing both speed and accuracy. The future goal is to realize real-time control through robot operating system implementation for the MPC-based AOS.

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S4. Optical Information Processing and Holography

Optical Information Processing and Holography III
Saturday, Dec. 2, 2023  10:45-12:00
Presider: Prof. Wei-Feng Hsu(National Taipei University of Technology, Taiwan) Prof. Jing-Heng Chen (Feng Chia University, Taiwan)
Room: 92185 (1F)
10:45 - 11:00
Manuscript ID.  1064
Paper No.  2023-SAT-S0403-O001
Vera Marinova Anisotropy of two-dimensional layered materials towards applications in ultrathin flat optical elements
Vera Marinova, IOMT-BAS (Bulgaria), NYCU (Taiwan); Vladimira Videva, Blagovest Napoleonov, Irnik Dionisiev, IOMT-BAS (Bulgaria); Stefan Petrov, NYCU (Taiwan), ISSP-BAS (Bulgaria); Minh Nguyen Hong Chau, NYCU (Taiwan); Dimitre Dimitrov, ISSP-BAS (Bulgaria), IOMT-BAS (Bulgaria); Ken Yuh Hsu, NYCU (Bulgaria); Shiuan Huei Lin, NYCU (Taiwan)

Two-dimensional (2D) layered materials demonstrate extremely high optical anisotropy that gains an enormous interest for integration in polarization nanodevice applications. Here, we present variety of synthesized 2D nanolayers/ flakes with their atomically thin structures confirmed by Raman, AFM and TEM analysis. Furthermore, high birefringence has been measured. We also demonstrate a polarization-plane rotation when linearly polarized light propagates through 2D nanoflakes that open a new road to integrate into atomically thin optical elements.

  Preview abstract
11:00 - 11:15
Manuscript ID.  0472
Paper No.  2023-SAT-S0403-O002
Stefan Petrov Aluminum doped Zinc Oxide thin films for multipurpose application as electrode and alignment layers in liquid crystal phase retarders
Stefan Petrov, National Yang Ming Chiao Tung University (Taiwan), Bulgarian Academy of Science (Bulgaria); Vera Marinova, Bulgarian Academy of Science (Bulgaria), National Yang Ming Chiao Tung University (Taiwan); Chau Nguyen Hong Minh, Shuan Huei Ling, Ken Hsu, National Yang Ming Chiao Tung University (Taiwan)

Here, we demonstrate the feasibility of transparent and conductive Aluminum-doped Zinc Oxide (AZO) thin films to operate simultaneously as electrode and alignment layer in Liquid Crystal (LC) device assembly. Controlling deposition process AZO layers with very high transparency and excellent conductivity were obtained. The exceptionally low surface free energy of (100) oriented AZO, along with the topological modification following mechanical rubbing treatment were used to elucidate the ordering mechanism of LC molecules on the surface of AZO film. The quality of the alignment and competitive electro-optical performance of the assembled LC device reveals the great potential of AZO thin films.

  Preview abstract
11:15 - 11:30
Manuscript ID.  0107
Paper No.  2023-SAT-S0403-O003
Pei-Ling Chen The Grating Period Measurement with Reflection Type Heterodyne Grating Interferometer
Pei-Ling Chen, Guan-Lin Huang, Shih-Han Hung, Cheng-Chih Hsu, National United University (Taiwan)

In this study, unknown grating period measurement of a reflection type grating can be determined by a heterodyne grating interferometer. The experiment results showed that the difference between proposed method and commercial product specification can be better than 10 nm.

  Preview abstract
11:30 - 11:45
Manuscript ID.  0791
Paper No.  2023-SAT-S0403-O004
Wun-Yan Chen Development of Surface Topography Measurement Based on Polarization Interferometry
Wun-Yan Chen, Yue-Jhe Tsai, Ju-Yi Lee, National Central University (Taiwan)

This research is based on Fizeau-type polarization interferometry and employs a polarization camera, which enables full-field measurement of the wafer surface topography. Polarization interference patterns are acquired from a Fizeau interferometer using the camera, which outputs four phase-quadrature interference patterns. The surface topography of the wafer can be determined by applying a phase-shifting algorithm to the four phase-quadrature interference patterns. The method only requires the acquisition of a single interference image to calculate the surface topography of the test object, making it suitable for measuring the surface topography of continuously curved surfaces and polished materials with various reflective properties.

  Preview abstract
11:45 - 12:00
Manuscript ID.  0672
Paper No.  2023-SAT-S0403-O005
Yan-Rui Lin Inspection for Micron-scale Circular Holes Based on the Shape-From-Focus Method
Yan-Rui Lin, Zheng-Hong Tsai, Ju-Yi Lee, National Central University (Taiwan)

Developing a three-dimensional shape measurement system based on shape-from-focus for measuring micron-scale processing holes in transparent materials. The system achieves a horizontal resolution of approximately 1.16 μm and a depth resolution of around 2 μm.

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S4. Optical Information Processing and Holography

Optical Information Processing and Holography IV
Saturday, Dec. 2, 2023  13:00-15:00
Presider: Prof. Shiuan-Huei Lin (National Yang Ming Chiao Tung University, Taiwan) Prof. Jung-Ping Liu (Feng Chia University, Taiwan)
Room: 92185 (1F)
13:00 - 13:30
Manuscript ID.  1086
Paper No.  2023-SAT-S0404-I001
Invited Speaker:
Takashi Kakue
Motion picture recording and observation of light propagation using light-in-flight recording by holography and its recent advances
Takashi Kakue, Chiba University (Japan)

We introduce ultrafast motion pictures of light propagation obtained by light-in-flight recording by holography (LIF holography). LIF holography has the following advantageous features: (1) recordability of spatiotemporally continuous motion pictures of light propagation, (2) recordability of three-dimensional images of propagating light, and (3) ultrahigh temporal resolution. We also review recent advances in LIF holography.

  Preview abstract
13:30 - 13:45
Manuscript ID.  0110
Paper No.  2023-SAT-S0404-O001
Chen-Ming Tsai The Heterodyne Light Source Generated by Time-varying Phase Distributed Pattern with Spatial Light Modulator
Chen-Ming Tsai, Chun-Yi Chang, Cheng-Chih Hsu, National United University (Taiwan)

In this study, novel heterodyne light source was constructed by spatial light modulator (SLM), in which the time-varying phase distributed pattern generated by the iterative Fourier transform technology to simulated a moving grating structure in SLM.

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13:45 - 14:00
Manuscript ID.  1001
Paper No.  2023-SAT-S0404-O002
Chang YU Lin Spectral Extraction Through a Mobile Phone with a modulated light and three-parameter sine wave fitting.
Chang YU Lin, Hsieh Hung-Chih, National United University (Taiwan)

A sinusoidal intensity modulated light source as a test signal and incident to a spectrometer. In order to separate the tested spectrum from a stray light mixed spectrum, the three-parameter sine fitting algorithm was used to calculate the amplitude intensity corresponding to the specified modulation frequency. The extracted test spectral signal was not affected by stray light. And it is developed on the mobile phone, and the separation spectrum can be obtained by using the mobile phone program.

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14:00 - 14:15
Manuscript ID.  0610
Paper No.  2023-SAT-S0404-O003
Chi Sun Visualization of Diffraction in Volume Holograms with VOHIL Model
Chi Sun, National Yang Ming Chiao Tung University (Taiwan), National Central University (Taiwan); Shiuan-Huei Lin, National Yang Ming Chiao Tung University (Taiwan); Chih-Yuan Cheng, Chung-Kuan Lin, Tsung-Hsun Yang, Yeh-Wei Yu, National Central University (Taiwan); Ching-Cherng Sun, National Central University (Taiwan), National Yang Ming Chiao Tung University (Taiwan)

In this paper, we show the calculation for volume holography optical element (VHOE) by VOHIL model. The phase maps visualize the phase consistency and the diffraction as well in various conditions. The model shows the accuracy of the diffraction from a volume hologram. Using VOHIL model, we visualize the diffraction property in reflection-type VHOE and make sure the limitation when designing a VHOE.

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14:15 - 14:30
Manuscript ID.  0314
Paper No.  2023-SAT-S0404-O004
Yu-Hsin Yang Auto Labeling and Classification of Microscopic Hyperspectral Image
Yu-Hsin Yang, Yu-Jen Chen, National Applied Research Laboratories (Taiwan), National Taiwan University (Taiwan); Guo-Hao Lu, Chao-Feng Liu, Chi-Hung Hwang, National Applied Research Laboratories (Taiwan); Sheng-Lung Huang, National Taiwan University (Taiwan); Chun-Jen Weng, National Applied Research Laboratories (Taiwan)

This study accomplishes the auto-labeling of microscopic hyperspectral images, alleviating human involvement in labor-intensive tasks and subjective assessments. This paper outlines the methods employed for auto-labeling, encompassing noise removal through the median filter, feature extraction via the N-finder algorithm, and labeling facilitated by the spectral angle mapper algorithm. Additionally, we introduce a fully-connected neural network model for cellular classification and present preliminary findings.

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14:30 - 14:45
Manuscript ID.  0248
Paper No.  2023-SAT-S0404-O005
Hsiang-Chen Wang Detection of sugar content of tomato with hyperspectral imaging
Jing-Yi Huang, Hsiang-Chen Wang, Yu-Cheng Lin, 1. Department of Mechanical Engineering and Advanced Institute of Manufacturing with High tech Innovations (Taiwan)

In the research, the hyperspectral imaging technology (HSI) was used to analyze the small tomato, and the spectral information obtained by the image through this technology was used for the analysis and prediction of the Brix of the small tomato, hoping to improve the existing sugar detection method.

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14:45 - 15:00
Manuscript ID.  0040
Paper No.  2023-SAT-S0404-O006
Ching-Yao Huang Simulation of Effective Power Change when Wearing High-Curvature Single Tilted Lenses
Ching-Yao Huang, Da-Yeh University (Taiwan)

This study is to simulate the effective power change when wearing high-curvature single tilted prescription lenses at different single tilt angles. The results show that the more the tilted angle, the less effective power change occurring at peripheral area of the high-curvature lens, but not for the low-curvature lens. Moreover, the power change profiles are different between high-curvature and low-curvature lenses, which verifies the importance of the lens design. It is suggested that an optical system combining a spectacle lens with a model eye is more suitable for the realistic simulation of power change of tilted prescription lenses.

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S4. Optical Information Processing and Holography

Poster Session II
Saturday, Dec. 2, 2023  13:30-16:30
Room: Building of Electrical Engineering (電機系館) (B1)

Manuscript ID.  0278
Paper No.  2023-SAT-P0402-P001
Bing-Han Zhuang Recording Method of Narrowband Volume Holographic Filter
Bing-Han Zhuang, Cheng-Ting Huang, Kun-Huang Chen, Jing-Heng Chen, Feng Chia University (Taiwan)

Optical filters have many important scientific applications. In this study, a recording method for narrowband volume holographic filters is proposed based on the K-vector geometry of coupled-wave theory. A special recording setup is employed with a right-angle prism to guide reference and object beams. Photopolymer holographic recording material is used with a 532nm laser to record a narrowband volume holographic filter with a central wavelength of 712nm and a full width-half maximum of 18nm. This method should offer advantages such as a simple and fast setup and flexible design parameters, providing a manufacturing solution with potential applications for narrowband filters.

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Manuscript ID.  0469
Paper No.  2023-SAT-P0402-P002
Da-Wei Huang High-Speed Scanning Holography without Interference
Da-Wei Huang, Chen-Ming Tsai, Jung-Ping Liu, Feng Chia University (Taiwan)

Scanning holography scans the object by a structured light and detects the scattered light as the holographic information. By applying a computational method, the three-dimensional image of the object can be reconstructed. Here, we propose a new technique scanning holography in which interference is avoided and thus the scanning speed can be faster.

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Manuscript ID.  0991
Paper No.  2023-SAT-P0402-P003
Hui-Ching Chang Spectral reconstruction of hyperspectral imaging from single RGB image
Hui-Ching Chang, Chung-Hsuan Huang, Chau-Jern Cheng, National Taiwan Normal University (Taiwan)

The study describes a spectral reconstruction approach using RGB image and spectral data to identify the relation between the colorimetry and the wavelength of commercial display devices for human visual needs. The experimental results confirmed the successful reconstruction of hyperspectral images from a single RGB image and reveal possible harmful spectral distributions which might be avoided in display devices design.

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Manuscript ID.  1039
Paper No.  2023-SAT-P0402-P004
Pei-Chi Li A one-shot approach for phase-shifting projected fringe profilometry
Pei-Chi Li, Wei-Hung Su, National Sun Yat-Sen University (Taiwan)

Fringe projection techniques based on phase-shifting algorithms to retrieve the 3D surface profile always take three or more measurements. In this paper, a one-shot method using the phase-shifting technique to describe the profile of inspected objects is presented. Accuracy of the presented method could be as high as those measured by a typical phase-shifting technique.

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Manuscript ID.  0117
Paper No.  2023-SAT-P0402-P005
Yu-Cheng Sheng Design of Radial and Azimuthal Polarized Beam Converters with 1XN Outputs
Yu-Cheng Sheng, Fu-Ming Lu, I-Hsiang Lai, Chien-Hung Yeh, Jing-Heng Chen, Feng Chia University (Taiwan)

Array output cylindrical vector beam converters are devices that can transform linearly polarized incident beams into multiple radial or azimuthal polarizations with arrayed outputs. The generated radial or azimuthal polarization offers numerous advantages and finds significant applications in various fields. However, currently available converters mostly allow the output of only one radial or azimuthal polarized beam. In this study, we propose a polarization converter based on a Mach-Zehnder-like interferometric structure, capable of simultaneously outputting four radially or azimuthally polarized beams. This device could enhance the application potential and efficiency in laser processing or detection.

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Manuscript ID.  0908
Paper No.  2023-SAT-P0402-P006
Xiang-Ting Huang Application of Color-mixing Light Source in Multiple Wavelength Overlay Measurement
Xiang-Ting Huang, Meng-Rong Wu, Yu-Fen Dai, Hung-Chih Hsieh, National United University (Taiwan)

In this study, we use a simple method for multi-wavelength measurement. Add different sine wave modulation frequencies to two different wavelengths in the color mixing light source. The three-parameter sine wave fitting method was used to separate two waves of different wavelengths. Applying this method to the overlay measurement in the semiconductor manufacturing process. The waveform data of the two signals can be obtained with only one acquisition, to improve the problem of consuming a large amount of measurement time.

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Manuscript ID.  0659
Paper No.  2023-SAT-P0402-P007
Chuan-Yu Tseng Measurement of the retardation of a wave plate by optical vortex light interferomety
Chuan-Yu Tseng, Jiun-You Lin, National Changhua University of Education (Taiwan)

This paper proposes an optical system for measuring the retardation of a wave plate using polarized vortex light interferometry. In the proposed system, the retardation of a wave plate can be estimated through measuring the inclination of the dark fringe generated by interference between two orthogonally polarized vortex light beams. The measurement accuracy of the phase retardation of the wave plates were estimated to be nearly 0.14 deg.

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Manuscript ID.  0823
Paper No.  2023-SAT-P0402-P008
Ko-Lun Chang Improving the Image Resolution of Diffractive Optical Elements for Wide-angle Structured Light Patterns
Yu-Jui Chen, Ko-Lun Chang, Wei-Feng Hsu, National Taipei University of Technology (Taiwan)

Currently structured light is one of the frequently-used techniques for 3D sensing. When designing structured light on a large scale, problems such as distortion and light intensity attenuation must be solved, which result into the farther away from the center and the lower the recognition speed and accuracy. This paper proposes a correction method for image distortion and design of images with high resolutions such as 4840×4840 pixels. After processing with various algorithms on diffractive optical elements (DOEs), we effectively increased the quality of the designed image. The DOEs were verified in numerical simulations and experimental physical samples.

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Manuscript ID.  0352
Paper No.  2023-SAT-P0402-P009
Tzu-An Chou Real-time Computer-Generated Holography for AR-HUD using Convolutional Neural Networks
Tzu-Han Pan, Tzu-An Chou, National Taiwan University of Science and Technology (Taiwan); Chih-Hao Chuang, Feng Chia University (Taiwan); Chuan-Feng Kuo, Chien-Yu Chen, National Taiwan University of Science and Technology (Taiwan)

This research proposes a novel AR-HUD system that uses an optimized DL-GSA algorithm for generating holograms. The algorithm employs an unsupervised learning convolutional neural network model to accurately generate holograms with different depths, enabling real-time calculations and dynamic AR-HUD images for enhanced driving safety and convenience.

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Manuscript ID.  0419
Paper No.  2023-SAT-P0402-P010
Yu-Chih Lin Multi-layers measurement in transparent sample by using low-coherence digital holographic microscopy
Yu-Chih Lin, Feng-Chia University (Taiwan)

We proposed and demonstrated a low-coherence digital holographic microscope which combination with a phase contrast architecture. The phase information can thus be obtained from different layers of the transparent sample.

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Manuscript ID.  1133
Paper No.  2023-SAT-P0402-P011
Panchai Kasri Digital Holographic Security using Deep Learning
Huang-Tian Chan, Panchai Kasri, Chi-Ching Chang, Ming Dao University (Taiwan)

In response to the growing demands for safeguarding confidential information and
protecting individual privacy, this research introduces a novel approach to digital holographic
encryption using Convolutional Neural Networks (CNNs). The study employs a phaseencoded digital holographic encryption system to secure object images, such as fingerprints.
The primary focus is on leveraging the U-Net architecture to construct an effective CNN
network for decryption. Experimental results demonstrate the CNN network's efficacy in
decrypting information and restoring digital holograms, with potential applications in digital
holography and cryptography, including message recovery.

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S4. Optical Information Processing and Holography

Optical Information Processing and Holography V
Saturday, Dec. 2, 2023  16:00-17:00
Presider: Prof. Wei-Hung Su (National Sun Yat-sen University, Taiwan) Prof. Yu-Chih Lin (Feng Chia University, Taiwan)
Room: 92185 (1F)
16:00 - 16:15
Manuscript ID.  0598
Paper No.  2023-SAT-S0405-O001
Shu-Han Chang Roll and Pitch Angular Displacement Measurement Based On Birefringence Polarization Interferometry
Shu-Han Chang, Wun-Yan Chen, Ju-Yi Lee, National Central University (Taiwan)

A roll and pitch angular displacement measurement technique is presented, which is based on the birefringence effect and phase detection of polarization interferometry with a polarization camera. The experimental results demonstrate that the maximum error is 0.041° for roll and 0.18° for pitch, and the system measurement range of 3° for both roll and pitch angles.

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16:15 - 16:30
Manuscript ID.  0267
Paper No.  2023-SAT-S0405-O002
Chun-Yu Kao Highspeed Hyperspectral Terahertz Compressed Sensing Imaging System
Chun-Yu Kao, Chia-Ming Mai, Shang-Hua Yang, Institute of Electronic Engineering (Taiwan)

In this work, we used a commercial terahertz spectral meter and digital micromirror device (DMD) to establish a compressed sensing system. The imaging system is driven by an asynchronous optical sampling system (ASOPS). Different objects are successfully measured and reconstructed under different frequencies. The experiment result can be justified with the ground truth.

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16:30 - 16:45
Manuscript ID.  0608
Paper No.  2023-SAT-S0405-O003
Ying-Tong Chen Comparative Analysis of Image Super-Resolution Techniques
Ying-Tong Chen, Chieh-En Lee, Chung-Hao Tien, National Yang Ming Chiao Tung University (Taiwan)

Traditional optical imaging directly records the refracted signal through a lens system. However, the image resolution is constrained by various physical limitations. Modern efforts focus on overcoming these restrictions to enhance resolution. This article will provide several methods for improving image resolution, including the implementation of post- processing techniques such as resampling and deep learning methods. A comparative analysis will reveal the most suitable method for enhancing image quality in different scenarios.

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16:45 - 17:00
Manuscript ID.  0614
Paper No.  2023-SAT-S0405-O004
Jing-Hao Huang Realizing dynamic switchable hologram by combining liquid crystal and metasurfaces
Tsung-Yu Huang, Li-Chen Su, Jing-Hao Huang, Ming Chi University of Technology (Taiwan)

Holographic technology has attracted a great deal of interest in the fields of optics over the world owing to its potential use in future optical applications such as holographic imaging and optical data storage. In this study, we would like to achieve the full 2 phase distributions by using a metasurface with liquid crystal module under different polarization. In this method, hologram can be selected by changing the incident polarizations. Finally, we obtained the phase shifts with 4 level modulation by simulation.

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S4. Optical Information Processing and Holography

Optical Information Processing and Holography VI
Sunday, Dec. 3, 2023  09:00-11:00
Presider: Prof. Huang-Ming Chen (National Yang Ming Chiao Tung University, Taiwan) Prof. Ju-Yi Lee (National Central University, Taiwan)
Room: 92185 (1F)
09:00 - 09:30
Manuscript ID.  1087
Paper No.  2023-SUN-S0406-I001
Invited Speaker:
Huang-Ming Chen
Development and Characterization of Liquid Crystal on Silicon (LCOS) Spatial Light Modulators
Huang-Ming Chen, National Yang Ming Chiao Tung University (Taiwan)

The molecular orientation of liquid crystals can be tuned by electric field resulting corresponded optical effects. In particular, liquid crystal on Silicon(LCOS) with small pixel array is a good candidate for dynamic spatial light modulators (SLMs). Dynamic phase modulation in the visible and near-IR region of LCOS has its advantage besides the intensity modulation applications.
In this talk, we will discuss how to achieve the high performance phase modulator in terms of phase precision and phase accuracy. In addition, the cause of pixel-level crosstalk effects and its suppressing solution will be discussed. Finally, the latest and future developments of LCOS.

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09:30 - 09:45
Manuscript ID.  0353
Paper No.  2023-SUN-S0406-O001
Chih-Chun Tan Improving metalens image quality by using artificial intelligence model
Chih-Chun Tan, Wei-Lun Hsu, Chen-Fu Huang, National Central University (Taiwan); Noreena Yi-Chin Liu, Universiti Brunei Darussalam (Brunei); Chih-Ming Wang, National Central University (Taiwan)

This study explores the use of autoencoder-based image processing to enhance GaN-based metalens images, addressing blurriness and color cast issues. The autoencoder model transforms blur images into low-dimensional vector, enabling the reconstruction of clear output images. Its effectiveness in handling severe color cast and demonstrates its potential in improving image quality, making it a promising solution for compact cameras with metalens technology.

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09:45 - 10:00
Manuscript ID.  0838
Paper No.  2023-SUN-S0406-O002
Chien-Yuan Han Developing a Resolution-Enhanced Mueller Matrix Microscopic System
Zi-Yun Huang, Chien-Yuan Han, National United University (Taiwan)

This study combined structured illumination technique, capturing images by changing azimuth and phase of structured light patterns, with our developed Mueller matrix imaging system to obtain resolution enhanced images which reveal more detailed polarization features of the sample. The wild-field and resolution enhanced images were demonstrated to prove the enhancement effect of this approach.

  Preview abstract
10:00 - 10:15
Manuscript ID.  0883
Paper No.  2023-SUN-S0406-O003
Jia-Kai Ye Doubling Diffraction Efficiency of Holographic Data Storage System
Jia-Kai Ye, Yi-Yung Chen, Yeh-Wei Yu, Tsung-Hsun Yang, Ching-Cherng Sun, National Central University (Taiwan)

In the paper, the information of the holographic storage system is multiplexed and recorded in the same area. By shifting the holographic plate, the readout position corresponds to a change in the wavefront of the reading beam, resulting in a phase change in the recorded information. Therefore, we design the phase of the superimposed signals to produce interference during the shift readout process, allowing for variations in signal intensity corresponding to different shift distances. Additionally, utilizing the information in reciprocal space enables higher uniformity in the readout information.

  Preview abstract
10:15 - 10:30
Manuscript ID.  0974
Paper No.  2023-SUN-S0406-O004
Mao-Shan Hsieh Aberration analysis of holographic optical lens
Mao-Shan Hsieh, Cheng-Chuan Liu, Yeh-Wei Yu, Ching-Cherng Sun, Tsung-Hsun Yang, National Central University (Taiwan)

HoloLens, nearing true mixed reality, employs tiny displays to project virtual images. Using Volume Holographic Optical Elements (VHOEs) as waveguides, it addresses the size-weight challenge faced by Head-Mount Displays (HMDs). However, VHOEs also counter diffraction and color issues. Leveraging VHOEs' Bragg selectivity, transparency reaches almost 90%, surpassing peers. Thus, we use this in our main focus: embedding lens systems in VHOEs, examining clarity. This aids future research on enhancing image quality.

  Preview abstract
10:30 - 10:45
Manuscript ID.  1048
Paper No.  2023-SUN-S0406-O005
Kai-Sheng Liu Characteristics of silica-azobenzene compounds for dynamic holographic recording
Kai-Sheng Liu, Fang-Yong Lee, Tzu-Chien Hsu, Wei-Hung Su, National Sun Yat-Sen University (Taiwan)

An azobenzene holographic material based on the {[4-(dimethylamino) phenyl] diazenyl} benzoic acid (Methyl red) for dynamic holographic recording is synthesized. The change in refractive index is induced by 532 nm DPSS laser with a total power intensity of 200mW/cm2. The first order diffraction can be detected in 0.3 seconds. Without holographic recording, the grating disappeared in 0.5 seconds. The rapid response in holographic recording /erasing makes it possible in dynamic applications.

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S4. Optical Information Processing and Holography

Poster Session III
Sunday, Dec. 3, 2023  09:00-11:00
Room: Building of Electrical Engineering (電機系館) (B1)

Manuscript ID.  0424
Paper No.  2023-SUN-P0403-P001
Zhen-Wei Wu Scratch Hologram made by CNC engraving machine
Zhen-Wei Wu, Jung-Ping Liu, Feng Chia University (Taiwan)

Scratches at specific locations on a smooth surface can produce three-dimensional bright spots, which is called scratch stereograms. Here, we took points from the input 3D model and calculated the location and orientation of the scratches. The scratch stereogram is fast fabricated on a plate by CNC engraving.

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Manuscript ID.  0827
Paper No.  2023-SUN-P0403-P002
Zong-Han Yang Implementation of Holographic Near-eye Displays Using Phase-mode Spatial Light Modulator and Holographic Optical Lens
Chung-Wei Chen, Zong-Han Yang, Zhi-Chan Yu, Wei-Feng Hsu, National Taipei University of Technology (Taiwan)

This paper presents a prototype of near-eye display device, containing a fiber source, a liquid-crystal-on-silicon spatial light modulator (LCoS-SLM), and a holographic optical lens (HOL). The total length of the presented apparatus from a fiber source to the LCoS-SLM is about 12 cm and the projected image was observed 25 cm behind the LCoS-SLM. The image is created from a diffractive optical element (DOE) displayed on the LCoS-SLM. The DOE is calculated by iterative Fourier transform algorithm (IFTA) followed by multiplied with a quadratic phase term to mimic a convergent lens.

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Manuscript ID.  0458
Paper No.  2023-SUN-P0403-P003
Yu-Jen Chen Determining Heart Rate Using CNN-based Feature Tracking on Features of Cardiac Surface Vessels
Yu-Jen Chen, Yu-Hsin Yang, National Applied Research Laboratories (Taiwan), National Taiwan University (Taiwan); Guo-Hao Lu, Chao-Feng Liu, Chun-Jen Weng, National Applied Research Laboratories (Taiwan); Chun-We Lai, National Tsing Hua University (Taiwan); Rong-Qing Qiu, Chi-Hung Hwang, National Applied Research Laboratories (Taiwan)

This study provides a method for tracking features on cardiac surface vessels for determining the heart rate by applying convolutional neural networks (CNN). We designed a complete procedure to accomplish this task, which includes image preprocessing, CNN model training, and sliding windows algorithm for feature finding. We tracked two features accurately and estimated the heart rate by analyzing the distance between them. This research explores the implementation of deep learning for extracting heart behaviors from a series of recorded medical images and the potential advancements in cardiac dynamic analysis and surgery monitoring.

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Manuscript ID.  0759
Paper No.  2023-SUN-P0403-P004
Hung-Chuan Hsu Comparative study of deconvolution methods for optical imaging system
Hung-Chuan Hsu, Sunil Vyas, Kuang-Yuh Huang, Hsien-Shun Liao, Yuan Luo, National Taiwan University (Taiwan)

In this work, we perform a systematic study of different deconvolution techniques, namely Wiener, Richardson-Lucy (RL), and the innovative Richardson-Lucy with total variation (RLTV), and compare their performance. Our results indicate that RL deconvolution outperforms Wiener regarding contrast enhancement and drastically improves image quality. RLTV is effective, efficient, and accurate, which may find important applications in high-resolution imaging.

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Manuscript ID.  0484
Paper No.  2023-SUN-P0403-P005
Zi-Hua Wang Zi-Hua Wang Numerical Simulation Analysis of the Relative Rotation Angle and Relative Period Ratio of Moiré Patterns
Zi-Hua Wang Zi-Hua Wang, Yan-Yu Chen Yan-Yu Chen, You-Yun Ma You-Yun Ma, Jing-Heng Chen Jing-Heng Chen, Feng Chia University (Taiwan)

The Moiré effect is a frequently employed image processing technique in optical measurements. In this paper, we employ MATLAB programming to numerically simulate and analyze the interference patterns of Moiré fringes based on the relative rotational angles and relative period ratios. Gaining insight into these Moiré pattern characteristics will aid in the application and development of digital Moiré effect measurement technologies.

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Manuscript ID.  0824
Paper No.  2023-SUN-P0403-P006
Yi-Yu Chou Application of Near-field Diffractive Optical Elements to Diffractive Additive Manufacturing for Transparent Materials
Fu-Hsiang Chan, Yi-Yu Chou, Min-Feng Chen, Wei-Feng Hsu, National Taipei University of Technology (Taiwan)

In this study, a 532nm green laser projects diffractive optical elements (DOE) in a spatial light modulator (SLM) to produce multiple 2D images separated in different spatial layers. Each layer's DOE was created using the iterative angular spectrum algorithm (IASA) for imaging in optical near field. Several techniques were employed to improve the image quality: Image shifting separates target shapes from SLM's reflection, temporal superposition reduces the speckle noise, and grayscale integration improves object continuity. The process shapes target objects using high-transparency resin, offering benefits of internal visualization, vertical continuity, and efficiency despite limited vertical variation and operational experience requirements.

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Manuscript ID.  0836
Paper No.  2023-SUN-P0403-P007
Kuang-Lei Huang Inspection of the semiconductors defects with computational refocusing algorithm and volumetric optical coherence tomography imaging
Kuang-Lei Huang, Po-Hao Tseng, Ting-Hao Chen, National Taiwan University (Taiwan); Hao-Chung Kuo, National Yang Ming Chao Tung University (Taiwan); Yasuno yoshiaki, University of Tsukuba (Japan); Hsiang-Chieh Lee, National Taiwan University (Taiwan)

Defects in compound semiconductor wafers may affect the lifetime as well as decrease the performance of the power devices. Therefore, in this study, we demonstrated a computational refocusing algorithm in combination with a high-resolution swept-source optical coherence tomography (SS-OCT) system setup to enhance the contrast of the defect images in silicon carbide (SiC) wafer. The location, distribution, and size of defects, including macro pits, stacking faults, micropipes, and particle inclusions, were analyzed quantitatively.

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Manuscript ID.  0860
Paper No.  2023-SUN-P0403-P008
Ru-Jyun Wei Reverse Construction of Semiconductor Finfet-fin Structure Based on Spectral Information with Deep Learning Model
Han Chen, Ru-Jyun Wei, Yung-Chiang Lan, National Cheng Kung University (Taiwan)

This work focuses on using deep neural networks for reconstructing structural parameters from spectral information. RCWA MATLAB code is used to simulate spectral signals (Psi and Delta) for different FinFET-Fin parameters. Simulated ellipsometric scatterometer data is utilized to train the inverse neural network (INN) by using PyTorch. The INN extracts critical features through convolution, aiming to predict accurate structural parameters by comparing outputs with actual values. On the other hand, contrary to INN, the forward neural network (FNN) predicts spectra based on structural parameters through transposed convolutions.

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Manuscript ID.  0934
Paper No.  2023-SUN-P0403-P009
Sunil Vyas Anisotropic Edge Contrast Enhancement Filters
Sunil Vyas, Yuan Luo, National Taiwan University (Taiwan)

The edge contrast enhancement can be explained using Hilbert and fractional Hilbert transforms. Implementation of spiral phase filtering can be performed experimentally or by image post-processing. Here, we performed a systematic study to demonstrate the effect of the order of phase singularity of the spiral phase mask on edge contrast enhancement. The effect is demonstrated using the simulation. It is observed that by continuously varying the order of phase singularity, the edge enhancement can be altered in a systematic manner. A continuous change of enhancement can be achieved from an anisotropic left to perfectly isotropic to an anisotropic right edge.

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Manuscript ID.  1029
Paper No.  2023-SUN-P0403-P010
Hsin-Yen Chiang Study on Exposure Conditions Affecting the Diffraction Efficiency of PQ/PMMA Volume Bragg Gratings
Hsin-Yen Chiang, Te-Yuan Chung, National Central University (Taiwan)

Using a 532nm green light laser as the recording light for intermittent exposure of the PQ/PMMA material through the two-beam interference method. This process can create periodic refractive index change structures in PQ/PMMA. Subsequently, detecting the diffraction efficiency by changing the light intensity, exposure time, and diffusion time, while also determining how they affect the diffraction efficiency. Finally, with the above experiment, the diffusion coefficient of PQ molecules will be found.

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Manuscript ID.  1121
Paper No.  2023-SUN-P0403-P011
Dina Grace Calbero Banguilan 2D Mapping of Optical Vortices
Dina Grace Calbero Banguilan, Nathaniel Hermosa, University of the Philippines Diliman (Philippines)

In this work, we demonstrate a technique to detect the positions of vortices using a digital micromirror device as a scanning triangular aperture and by measuring the intensity at the center of a pattern using a digital pinhole.

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