Session Index

S5. Optical Design, Testing, and Engineering

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.  0963
Paper No.  2023-FRI-P0501-P001
Ya-Hsin Hsiao Exploring Asymmetric Reflection at Exceptional Points in Plasmonic Non-Hermitian Metasurfaces
Ya-Hsin Hsiao, Po-Sheng Huang, Pin Chieh Wu, National Cheng Kung University (Taiwan)

Non-Hermitian metasurfaces can exhibit unique and unconventional optical behaviors due to the interaction between gain and loss, including effects like unidirectional reflection, nonreciprocal transmission, and enhanced sensitivity. Here, we designed a plasmonic non-Hermitian metasurface operating at an exceptional point (EP) for asymmetric reflection, and introduced Pancharatnam-Berry (PB) phase to achieve abnormal reflection of two degenerate circular polarized (CP) light under linear polarized (LP) light incidence.

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Award Candidate (Paper Competition)
Manuscript ID.  0782
Paper No.  2023-FRI-P0501-P002
Fan-Chang Meng Sub-KHz Narrow Linewidth Fiber Laser based on Saturable Absorber and Subring Resonators
Fan-Chang Meng, Zi Wang, Shien-Kuei Liaw, National Taiwan University of Science and Technology (Taiwan); Hiroki Kishikawa, Tokushima University (Japan); Chi-Wen Liao, Industrial Technology Research Institute (Taiwan)

This study proposed a high-quality fiber ring laser combining four-subring resonators and a saturable absorber within a ring cavity. A non-pumped erbium-doped fiber (EDF) is introduced as the saturable absorber (SA) within the ring structure. we arrange four subrings with different lengths to form the four-subring resonators, achieving a single-longitudinal-mode (SLM) operation. At a pump power of 100 mW, the laser maximum power and wavelength deviations during a one-hour test were measured to be 0.01 dB and 0.059 nm, respectively. we measured an ultra-narrow linewidth of 620 Hz.

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Award Candidate (Paper Competition)
Manuscript ID.  0949
Paper No.  2023-FRI-P0501-P003
Han-Ya Hsu Co-optimization of Phase and Amplitude for Beam Deflection Metasurfaces
Han-Ya Hsu, Po-Sheng Huang, Pin Chieh Wu, National Cheng Kung University (Taiwan)

Most metasurfaces suffer from low reflection efficiency in practical applications because they typically focus only on the phase profile during component design. To enhance their real-world applicability, we have developed a method that incorporates amplitude modulation into the design of beam deflection metasurfaces. With our approach, we have achieved a significant improvement in deflection efficiency, increasing it by approximately 60% for a 5° deflection angle and around 39% for a 25° deflection angle.

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Award Candidate (Paper Competition)
Manuscript ID.  0892
Paper No.  2023-FRI-P0501-P004
Chung-Wei Lin Diffraction Efficiency Enhancement of Volume Holographic Near-Eye-Display
Chung-Wei Lin, Chih-Yao Chang, Yeh-Wei Yu, Ching-Cherng Sun, Tsung-Hsun Yang, National Central University (Taiwan)

The research is to improve the efficiency of light transmission through a light guide with two volume holographic optical elements (VHOE). When light transmit in light guide, the angle tolerance causes filtering effects on mismatch wavelengths. To solve this problem, we simulate the wavelength distribution by using VOHIL after passing through the hologram. By recording the dispersive elements, the required wavelength distribution is created in order to direct different wavelengths to different angles. In addition, through the combination of phase superposition and dispersion elements, which utilizes the energy of the light source more efficiently and enhance the optical system efficiency.

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Award Candidate (Paper Competition)
Manuscript ID.  0767
Paper No.  2023-FRI-P0501-P005
Sheng-Jie Lu Method for extracting structural information from heliconical structures using the Berreman 4 × 4 matrix
Sheng-Jie Lu, Tseng-Yu Shiang Shiang, Chi-Tang Huang, Ko-Ting Cheng, National Central University (Taiwan)

In this study, an electrically tunable color filter has been demonstrated based on the modulation of heliconical structures of chiral nematics. In contrast to conventional chiral nematics with a bend elastic constant ( K33) larger than a twist one (K22), the chiral nematics with K33 smaller than K22 can maintain their helical textures while raising applied voltages. Apart from the demonstration of the tunability of heliconical structures, the structural information for the heliconical applied with different voltages has been extracted by the simulated spectra successfully.

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Award Candidate (Paper Competition)
Manuscript ID.  0787
Paper No.  2023-FRI-P0501-P006
Po-Kai Chang Engineering Leaky Bloch Modes and Mie Resonance in Dielectric Gratings for Optical Combiner
Po-Kai Chang, Jing-Ya Lin, Peichen Yu, National Yang Ming Chiao Tung University (Taiwan)

In our study, we design and fabricate an optical combiner based on a SiNx dielectric grating to serve as a reflective filter with an incident angle of 58 degrees. By optimizing the structural parameters with Rigorous Coupled Wave Analysis (RCWA), the spectral positions of Leaky Bloch mode and Mie resonance of the one-dimensional grating can be tuned to produce a high reflectivity of 78% at a wavelength of 500nm for the transverse-magnetic (TM) polarization. Additionally, a two-dimensional grating filter with a reflectivity of 73% at 532nm wavelength is designed, which is insensitive to the polarization of the incident light.

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Award Candidate (Paper Competition)
Manuscript ID.  0580
Paper No.  2023-FRI-P0501-P007
Bo-Yi Wu Study on Beam Deflection of Non-Periodic Blazed Grating Based on Optical Phased Array for LiDAR Application
Bo-Yi Wu, Chun-Nien Liu, Wood-Hi Cheng, National Chung Hsing University (Taiwan)

In this study, we present we present a Michelson interferometer to measure the phase change of the spatial light modulators (SLMs). In addition, we also compare the deflection angle and deflection efficiency of the beam under different periodic blazed gratings. Finally, at the maximum deflection angle of ±3.7°, the diffraction efficiency reaches 53%, and the side mode suppression ratio (SMSR) is lower than 3dB.

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Award Candidate (Paper Competition)
Manuscript ID.  0178
Paper No.  2023-FRI-P0501-P008
Chih-An Liu Computer Backlight Setting Effect on Concentration
Chih-An Liu, Jui-Yu Lin, Shu-Guang Girls' Senior High School (Taiwan); Yi-Siang Wang, Hong-Wei Yang, National Tsing Hua University (Taiwan); Ming-Li Chou, Shu-Guang Girls' Senior High School (Taiwan); Po-Ting Yeh, National Taiwan University Hospital (Taiwan); Jwo-Huei Jou, National Tsing Hua University (Taiwan)

Long-term exposure to blue-enriched computer screen backlight may lead to eye strain and discomfort, affecting concentration. To investigate, we attempted herein using typing speed to reflect the concentration under the influence of blue light. The results showed the typing speed to decrease from 25 words per minute to 23 after reading a novel with a traditional black text on white background for 30 minutes. Upon switching to a white text on dark background, the typing speed surprisingly increased from 24 words to 26, indicating blue light to have a profound effect on concentration.

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Award Candidate (Paper Competition)
Manuscript ID.  0558
Paper No.  2023-FRI-P0501-P009
Hung-Yi Lee Development and Integration of MEMS LiDAR Module for Autonomous Vehicle
Hung-Yi Lee, Chuan Mao Sheng, Nien Liu Chen, Hi Cheng Wood, National Chung Hsing University (Taiwan)

In this study, three wavelengths of 1540nm, 1550nm, and 1560nm, are employed to create a 120-degree MEMS LiDAR. This LiDAR configuration is optimized for short distances, allowing for simultaneous detection of both left and right lanes. The experimental findings indicate a remarkable 130-meter detection range in long-distance assessments, coupled with a consistent field of view and frame rate performance, with no instances of dropped frames. These favorable characteristics position it as a highly suitable solution for integration in autonomous vehicles.

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Award Candidate (Paper Competition)
Manuscript ID.  0718
Paper No.  2023-FRI-P0501-P010
Guan-Wei Huang FOV50-Degree Projection Lens Design, The Relationship Between Optical Distortion and TV Distortion
Guan-Wei Huang, Wen-Shing Sun, Jyun-Yi Yu, National Central University (Taiwan); Yi-Lun Su, Taiwan Instrument Research Institute (Taiwan)

This study proposes a projection lens for MR systems. This projection lens features a 50-degree of the lens system, with the entrance pupil at the first surface. The article will discuss the design specifications and image quality of this lens. And this article will discuss optical distortion and the relationship between TV Distortion and then follows optical rules.

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Award Candidate (Paper Competition)
Manuscript ID.  0683
Paper No.  2023-FRI-P0501-P011
Hsiang-Hsun Tsai Machine Learning for Improving Image Quality Under Michelson Interferometer Vibrations
Hsiang-Hsun Tsai, Hsi-Fu Shih, National Chung Hsing University (Taiwan); Yi-Hsuan Yang, Feng Chia University (Taiwan)

This study employs a novel strategy that combines machine learning and Wiener filter methods to improve the quality of interference images captured by a Michelson interferometer in vibrational environments. We combine advanced filter techniques with carefully constructed machine learning models to enhance interferometric images acquired under the influence of vibration conditions. Compared with traditional image quality improvement methods, our method has the ability to predict the quality of interference images, and can exclude low-quality images in advance, and its average accuracy is as high as 99.81%.

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Award Candidate (Paper Competition)
Manuscript ID.  0889
Paper No.  2023-FRI-P0501-P012
Ming-Yuan Chen Research On High-Speed Photography Based On HighIntensity Infrared Light Source
Ming-Yuan Chen, Ting-Wei Hsu, Chi-Shou Wu, Tsung-Hsun Yang, Yeh-Wei Yu, Ching-Cherng Sun, National Central University (Taiwan)

This paper aims to create a high-intensity infrared light as a light source. Its
purpose is not only for supplemental lighting in high-speed cameras but also for tracking the
movement of objects during motion. Subsequently, the video will be segmented into frames
for baseball analysis. Through this photo analysis, parameters such as ball velocity and pitch
type can be determined for baseball analysis.

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Award Candidate (Paper Competition)
Manuscript ID.  0354
Paper No.  2023-FRI-P0501-P013
Po-Jen Yu Terahertz Lenses with Mask Stereolithography 3D Printing Technology
Po-Jen Yu, National Tsing Hua University (Taiwan); Tsung-Chieh Tseng, National Yang Ming Chiao Tung University (Taiwan); Yu-Hang Wang, You-Chia Chang, Shang-Hua Yang, National Tsing Hua University (Taiwan)

3D printing technology is one most popular manufacturing techniques for prototyping while developing in terahertz (THz) technology. This work provides a new possibility of terahertz passive devices fabricated by masked stereolithography (mSLA) 3D printing technology. By designing and characterizing 3D printed THz lenses, our research showcases the feasibility of producing THz passive components through mSLA and demonstrates their performance and reliability in the real world.

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Award Candidate (Paper Competition)
Manuscript ID.  0209
Paper No.  2023-FRI-P0501-P014
Ping-Ching Hsieh Laser direction switching based on cholesteric liquid crystals
Ping-Ching Hsieh, Ting-Mao Feng, Yi-Fan Wang, Heng-Yi Tseng, Cheng-Chang Li, Hung-Chang Jau, Chie-Tong Kuo, Tsung-Heisn Lin, Chun-Ta Wang, National Sun Yat-sen University (Taiwan)

Photonic crystal lasers employing cholesteric liquid crystals (CLC) offer reduced threshold levels and compact sizes. We researched laser direction using CLC's planar and uniform lying helix (ULH) states. Temperature increases switch the CLC to the planar state, shortening the wavelength, while a perpendicular electric field in ULH state increases the pitch for diverse wavelength tunability in thermally tunable lasers.

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Award Candidate (Paper Competition)
Manuscript ID.  0217
Paper No.  2023-FRI-P0501-P015
Yung-Han Ho Controlling the chirality of light emission in thin-film lasers with liquid photonic crystal mirrors
Yung-Han Ho, Yi-Jyun Ke, Hung-Chang Jau, Ting-Mao Feng, Chun-Ta Wang, Tsung-Hsien Lin, National Sun Yat-sen University (Taiwan)

Photonic crystal laser consist of cholesteric liquid crystals mirrors can emit specific circular polarization light according to pitch number of chiral mirrors. By using Berreman numerical method and experiments, we verified that different emission chirality changes depending on pitch numbers. Besides, we discuss the effect of the defect layer thickness on the wavelength. The results not only show the realization of DBR laser with controllable circular polarization ratios in the emitted laser light but provide significant potential development of micro-laser sources with versatile emission properties.

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Manuscript ID.  0947
Paper No.  2023-FRI-P0501-P016
Yi-Chi Chen Plasmonic Topological Insulators with Complementary Dual-Layered Honeycomb Metal Structures Analyzed by FDTD Method
Yi-Chi Chen, Shih-hui Chang, Hung Yu Chang, National Cheng Kung University (Taiwan)

EM duality can be found with complementary patch and aperture structure in plasmonic Hexagonal lattice where both have the same dispersion relation but different TE/TM characteristics. Stacking the patch and aperture creates a 3D metal complementary structure and opens a bandgap at the K and K' points and forms Pseudospin states with valley degree of freedom. By combining the dual-layered structure and its flipped structure side by side, a boundary is formed. Exciting with pseudo-spin at the boundary allows for the observation of electromagnetic waves being confined to the edge with unidirectional propagation.

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Manuscript ID.  0979
Paper No.  2023-FRI-P0501-P017
En-Ci Gu Calculation of Chern Numbers in Valley Hall Plasmonic Topological Insulators by FDTD Method
Jia-Sheng Liou, En-Ci Gu, Shih-Hui Chang, NCKU (Taiwan)

This paper investigated the topological properties of plasmonic photonic topological insulators using the valley Hall theoretical models, along with the numerical simulation method of finite-difference time-domain (FDTD). It proposed a finite-discrete reciprocal lattice Chern number FDTD calculation method to determine the topological characteristics of the structures. The influence of different excitation methods on the Chern number of plasmonic topological insulators is explored.

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Manuscript ID.  0656
Paper No.  2023-FRI-P0501-P018
Yuan-Kai Zhou Designs of meta-lenses for optical fiber coupling
Yuan-Kai Zhou, Jin-Li Wong, Guo-Dung Su, National Taiwan University (NTU) (Taiwan)

In the last two decades, fiber-optic communication and photonic integrated circuits have been popularized rapidly. However, the dimension difference between optical fiber devices and photonic chips makes the design of fiber-to-chip couplers challenging. To solve this problem, several coupling strategies have been proposed, such as inverted taper-based structures, grating couplers and meta-material based couplers. In this paper, we attempted to design a high-efficiency metamaterial-based couplers for a quantum fiber-optic communication system. We theoretically show that the power efficiency of our design reach 85% with the MFD less than 3um.

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Manuscript ID.  0798
Paper No.  2023-FRI-P0501-P019
Shyh-Tsong Lin Instantaneous phase-shifting digital holographic microscope
Shyh-Tsong Lin, Yang-Jun Lin, Chang-Ping Pu, Jing-Heng Lin, Te-Chao Hu, National Taipei University of Technology (Taiwan)

Digital holographic microscopy combines digital holography with microscopy,
breaking through the limitations of traditional microscopes. It allows for numerical
reconstruction of the object's wavefront, enabling computer-controlled focusing without the
need for mechanical adjustments. Through analysis, it provides comprehensive information
about the light waves, including amplitude and phase. This allows for observing samples beyond
colored objects and provides more detailed information.

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Manuscript ID.  0907
Paper No.  2023-FRI-P0501-P020
Hong-Ru Feng Imaging with Synthetic Aperture Radar by Finite-Different Time-Domain Method
Hong-Ru Feng, Yi-Chien Lin, Shih-Hui Chang, National Cheng Kung University (Taiwan)

Scans of different targets are conducted using theoretical ISAR and the FDTD simulated ISAR method. First, the object consisting of a single point and two points were scanned and the results showed that both theoretic ISAR and FDTD-simulated ISAR successfully imaged a single point or two points. However, FDTD resulted in double ghost image. The target was changed to an actual aircraft. The results showed that theoretical ISAR was able to successfully reproduce the contours of the aircraft, while the FDTD-simulated ISAR only provided a rough depiction of the aircraft's shape.

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Manuscript ID.  0911
Paper No.  2023-FRI-P0501-P021
Yung-Chi Chen Modeling of Slot Antenna Arrays fed by Photonic Topological Waveguides based on Quantum Spin Hall Effect by FDTD Method
Yu-Hsing Lin, Yung-Chi Chen, Shih-Hui Chang, National Cheng Kung University (NCKU) (Taiwan)

This study primarily showcases the slot antenna array fed by photonics topological insulator operating at 60GHz by FDTD method. The simulation results show us The excitation efficiency of the array antenna using photonics topological insulator feed is better than that using microstrip-line feed.

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Manuscript ID.  1125
Paper No.  2023-FRI-P0501-P022
Yi-Ting Chen Miniaturized Light Field Microscopy for Three-Dimensional Imaging Applications
Yi-Ting Chen, National Taiwan University (Taiwan)

A light field microscope can capture not only the intensity of light rays from objects in a scene but also their direction and angle by using a specialized lens array. Through post-processing, images of objects with different focal plans can be obtained. In this work, a miniaturized light field device for live organism imaging is proposed.

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