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1,877 results on '"Kuo, Hao-Chung"'

19. Higher order mode supercontinuum generation in tantalum pentoxide (Ta2O5) channel waveguide.

Author

Fan, Ranran, Lin, Yuan-Yao, Chang, Lin, Boes, Andreas, Bowers, John, Liu, Jia-Wei, Lin, Chao-Hong, Wang, Te-Keng, Qiao, Junpeng, Kuo, Hao-Chung, Lin, Gong-Ru, Shih, Min-Hsiung, Hung, Yung-Jr, Chiu, Yi-Jen, and Lee, Chao-Kuei

Abstract

We fabricated tantalum pentoxide (Ta2O5) channel waveguides and used them to experimentally demonstrate higher-order mode supercontinuum (SC) generation. The Ta2O5 waveguide has a high nonlinear refractive index which was in an order magnitude of 10-14 cm2/W and was designed to be anomalously dispersive at the pumping wavelength. To the best of our knowledge, this is the first time a higher-order mode femtosecond pump based broadband SC has been measured from a nonlinear waveguide using the phase-matching method. This enabled us to demonstrate a SC spectrum spanning from 842 to 1462 nm (at - 30 dB), which corresponds to 0.83 octaves, when using the TM10 waveguide mode. When using the TE10 mode, the SC bandwidth is slightly reduced for the same excitation peak power. In addition, we theoretically estimated and discussed the possibility of using the broadband higher-order modes emitted from the Ta2O5 waveguide for trapping nanoparticles. Hence, we believe that demonstrated Ta2O5 waveguide are a promising broadband light source for optical applications such as frequency metrology, Raman spectroscopy, molecular spectroscopy and optical coherence tomography.

Published
2021

29. Recent advances in perovskites-based optoelectronics

Author

Liu Xiaoyan, Wang Yijie, Wang Yu, Zhao Yize, Yu Jinghao, Shan Xinyi, Tong Yi, Lian Xiaojuan, Wan Xiang, Wang Lei, Tian Pengfei, and Kuo Hao-Chung

Subjects
perovskite materials, optical memristive devices, photonic synapse and photonic neuromorphic computing, visible light communication, information encryption and decryption, Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

The development and utilization of perovskites are beneficial to improve or even change the optical properties of devices and obtain fascinating performances such as higher photoelectric conversion efficiency, better thermal stability, higher external quantum efficiency, more excellent remodeling, and flexibility. So, there are many articles on perovskite reviews having been reported from synthesis, properties to various applications (such as optoelectronic devices, electrical memristor, etc.). Based on the reported review of perovskites, this study will make a further supplement to the research progress of perovskites in visible light communication (VLC), optical neuromorphic devices, and highlight huge development prospects in these emerging fields in recent years. First, we briefly reviewed the preparation methods of common perovskite materials, followed by the optical and electrical characteristics. Then, the specific applications of optical properties based on perovskite materials are emphatically investigated, in addition to traditional photovoltaic devices, especially the latest cutting-edge fields of information encryption and decryption, VLC as well as optical memristive devices for photonic synapse and photonic neuromorphic computing. Finally, the main conclusions and prospects are given. Perovskite-based optical memristive devices are enabled to assist photonic neuromorphic calculations, showing huge potential application prospects in intelligent integrated chip fusing sensing, storage, and computing.

Published
2022
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31. Optimization of quantum well number of AlGaN/AlGaN deep-ultraviolet light-emitting diodes

Author

Suwito, Galih Ramadana, Shih, Ya-Hsuan, Chen, Sung-Wen Huang, Zhang, Zi-Hui, and Kuo, Hao-Chung

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

In this work, performance and characteristics of AlGaN/AlGaN deep-ultraviolet light-emitting diodes (DUV LEDs) with varied number of quantum-well (QW) are investigated numerically. From our simulation, 1-QW structure give the best performance at low injection current. However, at higher injection current, 2-QWs structure give the largest power output due to its higher total radiative recombination rate and internal quantum efficiency (IQE) compared to other structures. The 2-QWs structure also has less serious efficiency droop at high current than 1-QW, which makes it an optimum structure for high-power LEDs., Comment: 11 pages, 4 figures, and one table

Published
2018

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