Session Index

S1. Nanophotonic Materials and Devices

Nanophotonic Materials and Devices II
Friday, Dec. 1, 2023  15:15-17:30
Presider: Prof. Po-Tsung Lee (National Yang Ming Chiao Tung University, Taiwan) Dr. Yun-Chorng Chang (Research Center for Applied Sciences, Academia Sinica, Taiwan)
Room: 92119 (靄雲廳) (1F)
15:15 - 15:45
Manuscript ID.  0633
Paper No.  2023-FRI-S0102-I001
Invited Speaker:
Kenneth Järrendahl
Optical Studies of Beetle Cuticle as Biomimetical Inspiration for Novel Synthetic Materials
Kenneth Järrendahl, Linköping University (LiU) (Sweden)

Over the past decade, our research has been dedicated to in-depth investigations of scarab beetle cuticle properties through Mueller matrix spectroscopic ellipsometry. This explorationhas not only unveiled the intricate optical characteristics of these natural materials but has also sparked the development of novel synthetic materials. In this presentation, we will showcase the potential of this research through the utilization of cellulose nano-fibrils for camouflage applications, as well as cellulose nanocrystals (CNCs) and AlN-based thin films to generate circularly polarized light. We will
discuss our latest findings, demonstrating the capabilities of CNCs as optical diodes for circularly
polarized light and non-reciprocal reflection properties of magnetron sputtered HfAlN thin films.

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15:45 - 16:00 Award Candidate (Paper Competition)
Manuscript ID.  0114
Paper No.  2023-FRI-S0102-O001
Chang-Yi Lin Asymmetric Vortex Beam Generation from Dielectric Janus Metasurfaces
Chang-Yi Lin, Jhih-Hao Huang, Lu-Yun Wang, Po-Cheng Yang, Yao-Wei Huang, National Yang Ming Chiao Tung University (Taiwan)

Janus metasurfaces provide degree of freedom by imparting the light with the different incident direction. Directional Janus metasurfaces operating at microwave and near infrared region have been demonstrated several years ago. However, the multilayer design of the Janus metasurface is an addition of difficulty for fabrication. Here, we experimentally demonstrate monolayer Janus metasurfaces in the visible with TiO2 nanopillars. By taking advantage of the propagation and geometric phase control, different desired states of orbital angular momentum (OAM) for two opposite directions are achieved. We believe the direction-dependent metasurface has the potential in holograms, laser mode modulation and optical combiner.

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16:00 - 16:15 Award Candidate (Paper Competition)
Manuscript ID.  0128
Paper No.  2023-FRI-S0102-O002
Wen-Cheng Hsu Depth sensing and facial recognition with metasurface and PCSEL integration
Wen-Cheng Hsu, National Yang Ming Chiao Tung University (Taiwan), Hon Hai Research Institute (Taiwan); Chia-Hsun Chang, National Yang Ming Chiao Tung University (Taiwan); Yu-Heng Hong, Hon Hai Research Institute (Taiwan); Hao-Chung Kuo, National Yang Ming Chiao Tung University (Taiwan), Hon Hai Research Institute (Taiwan); Yao-Wei Haung, National Yang Ming Chiao Tung University (Taiwan)

We present a novel depth sensing system for facial recognition applying metasurfaces and photonic crystal surface-emitting lasers (PCSELs). Our lens-free, single-shot system projects 45,700 infrared dots from a compact 297² μm² sample area, offering a wide 158° field-of-view (FOV) with low power consumption. Compared to traditional dot projectors, our design is 233 times smaller and consumes 5-10 times less power due to PCSELs. The GaAs-based meta-hologram and simple optical architecture make it lighter and more energy-efficient, suitable for wearable devices. This technology overcomes limitations of bulky dot projectors, paving the way for integration into compact wearable devices.

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16:15 - 16:30 Award Candidate (Paper Competition)
Manuscript ID.  0362
Paper No.  2023-FRI-S0102-O003
Ming-Hung Hou Artificial Intelligence for Material and Geometric Prediction in Meta-Optics
Ming-Hung Hou, Chih-Ming Wang, National Central University (Taiwan)

This research aims to address the challenge of the lack of geometric and material data
in the study of photonic metasurfaces. We employed a conditional deep convolutional
generative adversarial network to train the model, and through continuous parameter
optimization, we achieved the capability to predict geometric structures and material
information solely based on spectral data. Subsequently, we used the rigorous coupled-wave
analysis simulation method to observe the consistency between the simulated spectra and the
target spectra.

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16:30 - 16:45 Award Candidate (Paper Competition)
Manuscript ID.  0364
Paper No.  2023-FRI-S0102-O004
Zong-Yu Chen Nanoimprint Lithography for PB Phase Metalens
Zong-Yu Chen, Chih-Ming Wang, National Central University (Taiwan)

Metalenses ,which are thinner than conventional lenses ,usually fabricated using electron beam lithography. However, this method is costly and not suitable for rapid mass production. Therefore, nanoimprint lithography has become an ideal solution to this problem. In this work, we are going to fabricate a metalens with a size of 330µm*330µm by nanoimprinting. First, we transfer the pattern of the metalens onto the polymer Topas8007 as a stamp for the nanoimprint. The pattern on the Topas8007 stamp is a reversed structure. Subsequently, the pattern is transferred onto the photoresist material using the Topas8007 stamp.

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16:45 - 17:00
Manuscript ID.  0200
Paper No.  2023-FRI-S0102-O005
Chien-Nan Kao Experimental demonstration of 2D free-space Gaussian beam emitters on silicon photonic platform
Jun-Ying Lin, Chien-Nan Kao, Yi Zhao, Ping-Yen Hsieh, You-Chia Chang, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University (Taiwan)

We design and fabricate an emitter on the silicon photonic platform to generate a 2D Gaussian beam into free space. We first engineer the coupling from a strip waveguide to a slab waveguide for mode expansion in the first dimension. The light in the slab waveguide then gradually out-couples to free space via a meta-grating and achieves mode expansion in the second dimension. We experimentally demonstrate a mode conversion from a 450 nm × 220 nm waveguide to a 2D free-space Gaussian beam with a 1/e2 beam diameter of 58.4 µm.

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17:00 - 17:15 Award Candidate (Paper Competition)
Manuscript ID.  0274
Paper No.  2023-FRI-S0102-O006
Ya-Ting Tsai High Circular Polarization Degree from Photonic Crystal Defect Cavity Lasers
Ya-Ting Tsai, Chao-Chieh Cheng, Tzu-Wei Huang, National Yang Ming Chiao Tung University (Taiwan), Academia Sinica (Taiwan); Wei-Ting Wang, Pi-Ju Cheng, Academia Sinica (Taiwan); Shu-Wei Chang, Min-Hsiung Shih, National Yang Ming Chiao Tung University (Taiwan), Academia Sinica (Taiwan)

We demonstrated a D1 defect photonic crystal defect laser with structural variations, and compared the lasing properties with the unperturbed D1 photonic crystal defect cavity. The high circular polarization lasing action was observed from the photonic crystal defect cavity.

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17:15 - 17:30
Manuscript ID.  0167
Paper No.  2023-FRI-S0102-O007
Ping-Yen Hsieh Chip-scale confocal laser-scanning microscope based on optical phased array
Ju-Wei Wang, Hsin-Hung Lin, Sheng-I Kuo, National Yang Ming Chiao Tung University (Taiwan); Zohauddin Ahmad, National Central University (Taiwan); Ping-Yen Hsieh, National Yang Ming Chiao Tung University (Taiwan); Jin-Wei Shi, National Central University (Taiwan); You-Chia Chang, National Yang Ming Chiao Tung University (Taiwan)

We demonstrate a chip-scale confocal microscope based on a 30-element active optical phased array (OPA). We calibrate the fabrication-induced phase errors with a novel algorithm, showing 10 times faster convergence than the genetic algorithm. We perform confocal depth sensing by dynamic scanning of the focal length. Using the OPA-based microscope, we reconstruct a 3D topology image that resolves a height difference of 8.05µm.

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