Session Index

S9. Optical Sensing

Optical Sensing V
Sunday, Dec. 4, 2022  09:00-10:45
Presider: Chien-Hsing Chen、Zhi-Ting Ye
Room: 2F A205
09:00 - 09:15
Manuscript ID.  0506
Paper No.  2022-SUN-S0905-O001
Jia-Yi Xu LiDAR Velocity Measurement through Hilbert Phase Subdivision
Jia-Yi Xu, Shih-Hsiang Hsu, National Taiwan University of Science and Technology (Taiwan)

The Hilbert-transform phase detection method implements a digital auxiliary interferometer and resamples the signal to compensate for the nonlinear frequency sweeping phenomenon. When the data acquisition sampling rate is set to the maximum of 1 million points/s, the resampling points from zero-crossing and Hilbert-transform are around 200,000 and 1,000,000, respectively. Compared with the zero-crossing resampling, the Hilbert-transform can precisely characterize a velocity of 200 mm/s and its standard deviation of 0.749 mm/s.

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09:15 - 09:30
Manuscript ID.  0551
Paper No.  2022-SUN-S0905-O002
Chih-Chieh Li The Two-Dimensions Bending Fiber Sensor for Applying in an Endoscopy
Chih-Chieh Li, Wen-Fung Liu, Feng Chia University (Taiwan); Cheng-Yu Lin, Feng Chia University (Taiwan), National Taiwan University (Taiwan); Yu-Chun Chang, Feng Chia University (Taiwan); Ming-Yue Fu, Air Force Academy (Taiwan); Yi-Lin Yu, Feng Chia University (Taiwan)

We proposed a two-dimension bending sensor based on two fiber Bragg gratings by using a special design structure and resin material for detecting both the bending curvature and bending direction of sensing head in endoscope.

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09:30 - 09:45
Manuscript ID.  0717
Paper No.  2022-SUN-S0905-O003
Cheng-Yu Chung Development of a transmission linear encoder based on double-diffraction design
Cheng-Yu Chung, Hung-Lin Hsieh, National Taiwan University of Science and Technology (Taiwan)

In this study, a transmission linear encoder based-on double-diffraction design is proposed for displacement measurement. By using the design concept of double-diffraction, the system sensitivity and resolution can be enhanced. Experimental results show that the resolution and repeatability of the proposed method can reach 3.6 nm and 1.69 nm, respectively.

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09:45 - 10:00
Manuscript ID.  0761
Paper No.  2022-SUN-S0905-O004
Chi-Hong Pan Optical, Structural and Photodetection Properties of Zinc Selenide Thin Films
Chi-Hong Pan, Wen-Yen Chen, Han-Wen Liu, Fang-Hsing Wang, National Chung Hsing University (Taiwan)

This work mainly studied the optimization of chemical bath deposition (CBD) of zinc selenide (ZnSe) thin films and its application in photodetectors. The deposition time had a significant effect on the film properties. All ZnSe thin films exhibited a cubic crystal structure with predominant (111) orientation. Through two-step CBD deposition and copper doping, the photo response of the device to blue light was greatly improved, and the maximum photo responsivity increased significantly by 10^5 to 104 mA/W.

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10:00 - 10:15
Manuscript ID.  0772
Paper No.  2022-SUN-S0905-O005
Kuan-Ming Chen AlGaN Photodetector with Electrochemical Etching Porous-AlGaN/GaN Multi-Channels
Kuan-Ming Chen, National Chung Hsing University (Taiwan)

AlGaN-based photodetector (PD) with multi-AlGaN/GaN channels has been demonstrated on the sapphire substrate. The multi-AlGaN/GaN layer has been transformed into the porous-AlGaN/n-GaN stack structures through the wet etching process. 25.2nm-thick porous-AlGaN layer and 24.8nm-thick GaN layer were observed clearly in the TEM micrograph. The insulated AlGaOx layers were formed surrounding the porous structure to suppress the surface leakage current. High photo-current and high responsivity were measured in the treated PD structures. Peak responsivity values were observed at 335nm of the wet etched PD structures compared to the ST-PD structure.

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10:15 - 10:30
Manuscript ID.  0774
Paper No.  2022-SUN-S0905-O006
Chia-Chin Cheng Sub-terahertz spectroscopy using a quasi-optical system for solution characterization
Chia-Chin Cheng, Che-Min Wu, National Tsing Hua University (Taiwan)

In this work, we proposed a 2f quasi-optical system for solution characterization. The 2f quasi-optical system is driven by a Vector Network Analyzer (VNA). We successfully measured the optical property of water in the sub-terahertz region under 18 GHz to 26.5 GHz. It has been compared with available data to justify the accuracy of the quasi-optical system.

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10:30 - 10:45
Manuscript ID.  0819
Paper No.  2022-SUN-S0905-O007
Naushad Ahmad Khan Photo-Reduction of Silver Nanoparticles on Gold Nanoprisms and the SERS Application
Naushad Ahmad Khan, Chang Gung University (Taiwan); Jiunn-Woei Liaw, Chang Gung University (Taiwan), Linkou Chang Gung Memorial Hospital (Taiwan)

The photo-reduction of silver nanoparticle, as solver nitrate solution being irradiated by LED light, on gold nanoprisms as substrate is studied. The medium contains ascorbic acid as reducing agent. The productions of this photo-reduction of are 3D flower-like structures with many sharp edges. These bimetallic nanocomposites serve as an excellent substrate for SERS enhancement for detecting R6G. The deposition of Ag on Au prisms also makes these bimetallic nanocomposites stable for a longer period of time.

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