Faculty

葉秉慧 Pinghui Sophia Yeh photo
Position
Professor
Education
Ph.D., University of Maryland, College Park, Maryland
E-mail
pyeh@mail.ntust.edu.tw
Room
T2-504-2

Office Hours Tue. 10:30~11:30 a.m. and Wed. 2~4 p.m.
Telephone 886-2-2737-6368
FAX 886-2-2737-6424
Homepage
Laboratory Novel Light Sources Lab
Major Field Semiconductor Lasers and LED, Crystal Fiber Light Sources and Amplifiers, Bio-Medical Photonics, Optical Communications.
Course Physics, Optoelectronic Devices, Solid State Lighting, Semiconductor Optoelectronic Devices

2021.02 ~ present Professor, National Taiwan Univ. of Science and Technology
2015.02 ~ 2021.01 Associate Professor, National Taiwan Univ. of Science and Technology
2007.02 ~ 2015.01 Assistant Professor, Dept. of Electronic Engineering, National Taiwan University of Science and Technology
2001.10 ~ 2007.01 Founder and President, Optospace Technologies Inc.
1999.01 ~ 2001.09 Section Manager, SDL, Inc./JDS Uniphase
1995.07 ~ 1998.12 Engineer, SDL, Inc.


2006 Received NIH SBIR award.
2005 Received NSF SBIR award.
2003 Invited to be one of the panelists for U.S. National Science Foundation, Small Business Innovation Research (SBIR) program.
2003 Received NSF SBIR award.

Research Achievement
  [1]   Ching-Hua Chen, Jia-Jun Zhang, Chang-Han Wang, Yu-Chia Chang and Pinghui S. Yeh*, " Constant Optical Power Operation of an Ultraviolet LED Controlled by a Smartphone," Sensors, 21, 4707, 2021.
  [2]   Yen-Yu Liu, Tsung-Che Wu and Pinghui S. Yeh*, "Etch-stop process for precisely controlling the vertical cavity length of GaN-based devices," Materials Science in Semiconductor Processing, 120, 105265, 2020.
  [3]   Ching-Hua Chen, Jia-Jun Zhang, Chang-Han Wang, Tzu-Chieh Chou, Rui-Xiang Chan and Pinghui S. Yeh*, "Output Power Monitoring of Ultraviolet Light-Emitting Diodes via Sapphire Substrate," Photonics, 7, 63, 2020.
  [4]   Tzu-Te Yang, Teng-I Yang, Rajendran Soundararajan, Pinghui S. Yeh, Chun-Yi Kuo, Sheng-Lung Huang*, and Silvano Donati, "Widely Tunable, 25-mW Power, Ti:sapphire Crystal-Fiber Laser," IEEE Photonics Technology Letters, 31(24), 1921-1924, 2019.
  [5]   Yu-Chieh Chiu, Pinghui Sophia Yeh*, Tzu-Hsun Wang, Tzu-Chieh Chou, Cheng-You Wu, and Jia-Jun Zhang, "An Ultraviolet Sensor and Indicator Module Based on p–i–n Photodiodes," Sensors, 19(22), 4938, 2019.
  [6]   Pinghui S. Yeh*, Yu-Chieh Chiu, Tsung-Che Wu, Yan-Xiang Chen, Tzu-Hsun Wang, and Tzu-Chieh Chou, "Monolithic integration of GaN-based phototransistors and light-emitting diodes," Optics Express, 27(21), 29854-29862, 2019.
  [7]   Pinghui S. Yeh*, Teng-Po Hsu, Yen-Chieh Chiu, Sian Yang, Cheng-You Wu, and Jung-Shan Liou, "III-Nitride Phototransistors Fabricated on a Light-Emitting-Diode Epitaxial Wafer," IEEE Photonics Technology Letters, V. 29, n. 19, pp. 1679-1682, 2017. [SCI, EI]
  [8]   P. S. Yeh*, C.-C. Chang, Y.-T. Chen, D.-W. Lin, J.-S. Liou, C. C. Wu, J. H. He, and H.-C. Kuo, "GaN-based vertical-cavity surface emitting lasers with sub-milliamp threshold and small divergence angle," Applied Physics Letters, V. 109, n. 24, 241103, 2016. [SCI, EI]
  [9]   Yi-Ting Huang, Pinghui S. Yeh*, Yen-Hsiang Huang, Yu-Ting Chen, Chih-Wei Huang, Cong Jun Lin, and Wenchang Yeh, "High Performance InGaN p-i-n Photodetectors Using LED Structure and Surface Texturing," IEEE Photonics Technology Letters, V. 28, n. 6, pp. 605-608, 2016. [SCI, EI]
  [10]   Pinghui S. Yeh*, Meng-Chun Yu, Jia-Huan Lin, Ching-Chin Huang, Yen-Chao Liao, Da-Wei Lin, Jia-Rong Fan, and Hao-Chung Kuo, "GaN-Based Resonant-Cavity LEDs Featuring a Si-Diffusion-Defined Current Blocking Layer," IEEE Photonics Technology Letters, V. 26, n. 24, pp. 2488-2491, 2014. [SCI, EI]
  [11]   Pinghui S. Yeh*, Chien-Wei Chen, Bing-Ru Yang, and Lu-Sheng Hong, " Light-scattering effectiveness of two-dimensional disordered surface textures in thin-film silicon solar cells," Applied Optics, V. 53, n. 13, pp. 2847-2852, 2014. [SCI, EI]
  [12]   C. C. Lai, C. P. Ke, S. K. Liu, C. Y. Lo, D. Y. Jheng, S. C. Wang, S. R. Lin, P. S. Yeh, and S. L. Huang*, "Intracavity and resonant Raman crystal fiber laser," Applied Physics Letters, 100, 261101, 2012. [SCI, EI]
  [13]   C. C. Lai, C. P. Ke, S. K. Liu, D. Y. Jheng, D. J. Wang, M. Y. Chen, Y. S. Li, P. S. Yeh, and S. L. Huang*, “Efficient and low-threshold Cr4+:YAG double-clad crystal fiber laser,” Optics Letters, V. 36, n. 6, pp. 784-786, 2011. [SCI, EI]
  [14]   Yen-Sheng Lin, Tzu-Chieh Cheng, Chien-Chung Tsai, Kuang-Yu Hsu, Dong-Yo Jheng, Chia-Yao Lo, Ping-Hui S. Yeh, and Sheng-Lung Huang*, “High-Luminance White-Light Point Source Using Ce,Sm:YAG Double-Clad Crystal Fiber,” IEEE Photonics Technology Letters, V. 22, n. 20, pp. 1494-1496, 2010. [SCI, EI]
  [15]   K. Y. Huang, K. Y. Hsu, D. Y. Jheng, W. J. Zhuo, P. Y. Chen, P. S. Yeh, and S. L. Huang, “Low-loss propagation in Cr4+:YAG double-clad crystal fiber fabricated by sapphire tube assisted CDLHPG technique,” Optics Express, V.16, n.16, pp. 12264-12271, 2008. [SCI, EI]
  [16]   C. Y. Lo, K. Y. Huang, J. C. Chen, C. Y. Chuang, C. C. Lai, S. L. Huang, Y. S. Lin, and P. S. Yeh, “Double-clad Cr4+: YAG crystal fiber amplifier,” Optics Letters, V. 30, n. 2, pp. 129-131, 2005. [SCI, EI]
  [17]   V. Dominic, S. MacCormack, R. Waarts, S. Sanders, S. Bicknese, R. Dohle, E. Wolak, P. S. Yeh, and E. Zucker, “110W fibre laser,” Electronics Lett., V. 35, pp. 1158-1160, 1999. [SCI, EI]
  [18]   C.-C. Lu, S. Jiang, P. S. Yeh, P. Heim, C. E. C. Wood, and M. Dagenais, “Wavelength conversion using a T-gate laser,” IEEE Photonics Technology Letters, V. 8, n. 1, pp.52-54, 1996. [SCI, EI]
  [19]   P. S. Yeh, I-F. Wu, S. Jiang and M. Dagenais, “High-power high-gain monolithically integrated pre-amplifier/power amplifier,” Electronics Letters, V. 29, n. 22, pp. 1981-1983, 1993. [SCI, EI]
  [1]   Heng-I Lee, Li-An Yang, Chih-Ying Chen, Pinghui S. Yeh*, and Sheng-Lung Huang, “Laser Heated Pedestal Growth of Cr: Forsterite Crystalline Fibers Applied as Continuous-Wave Broadband Light Source for Optical Coherence Tomography,” Collaborative Conference on Crystal Growth (3CG), paper P03, Sep. 4-8, 2016 (Donostia?San Sebasti?n, Spain)
  [2]   Pinghui Sophia Yeh*, Chi-Chieh Chang, Yu-Ting Chen, Da-Wei Lin, Chun Chia Wu, Jhao Hang He, and Hao-Chung Kuo, “Blue resonant-cavity light-emitting diode with half milliwatt output power,” SPIE Photonics West, oral paper 9768-23, Feb. 13-18, 2016 (San Francisco, USA). Proc. SPIE 9768-23, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX, 97680P.
  [3]   Tuan-Shu Ho, Jeng-Wei Tjiu, Meng-Ting Chien, Dong-Yi Wu, Chia-Kai Chang, Pinghui S. Yeh, Yu-I Li, Chia-Tung Shun, and Sheng-Lung Huang*, “Functional optical coherence tomography on human skin with cellular resolution,” BioPhotonics, invited paper, Fr 5.1, May 20-22, 2015 (Florence, Italy)
  [4]   Pinghui S. Yeh*, Chien-Wei Chen, Yu-Ting Chen, and Lu-Sheng Hong, “Optimization of Embedded Nano-particles for Energy Conversion,” Asia-Pacific Conference on Electrochemical Energy Storage and Conversion (APEnergy 2014), P50, Feb. 5-8, 2014 (Brisbane, Australia)
  [5]   Chien-Wei Chen, Bing-Ru Yang, Pinghui S. Yeh*, and Lu-Sheng Hong, “Simulation of silicon tandem solar cells surface-textured with low-refractive-index material,” the 23rd PVSEC (International Photovoltaic Science and Engineering Conference), paper 2-O-6, Oct. 28-Nov. 1, 2013 (Taipei, Taiwan)
  [6]   Bing-Ru Yang, Pinghui S. Yeh*, and Lu-Sheng Hong, “Simulation of microsphere-surface-textured glass for broadband light trapping in silicon thin-film solar cells,” 27th EU PVSEC (European Photovoltaic Solar Energy Conference), 3DV.1.19, Sep. 24-28, 2012 (Frankfurt, Germany)
  [7]   T. S. Ho, N. C. Cheng, C. K. Chang, K. Y. Hsu, D. Y. Jheng, Y. T. Wang, Y. S. Lin, C. C. Lai, P. L. Huang, S. L. Huang*, P. S. Yeh, and J. W. Tjiu, “Glass-clad crystal fibers based functional optical coherence tomography,” invited, paper We2.7, BioPhotonics, June 8-10, 2011 (Parma, Italy).
  [8]   C. C. Tsai, K. Y. Hsu, Y. T. Wang, Y. S. Lin, D. Y. Jheng, C. K. Chang, P. L. Huang, E. Sun, S. L. Huang* and P. S. Yeh, “Glass-Clad Crystal Fibers Based Ultrahigh Resolution Optical Coherence Tomography,” Invited paper, Summer Topical Meeting on Novel Waveguiding, Structures and Phenomena, July 19-21, 2010 (Riviera Maya, Mexico)
  [9]   P. S. Yeh*, H. Y. Wang, K. Y. Huang, S. L. Huang, K. Y. Hsu, and D. Y. Jheng, “Fabrication and Characterization of Cr:Forsterite Single Crystal Fiber,” SPIE Photonics West, paper 7195-68, Jan. 24-29, 2009 (San Jose, CA), published on Proc. SPIE, Vol. 7195, 71951W (2009) [EI]
  [10]   S. L. Huang, K. Y. Huang, K. Y. Hsu, C. N. Tsai, and P. S. Yeh, “Broadband emission and amplification from chromium-doped fibers ,” (invited paper), SPIE Asia-Pacific Optical Communications, paper 6781-81, Nov. 1-5, 2007 (Wuhan, China).
  [11]   C. Y. Lo, K. Y. Huang, J. C. Chen, C. Y. Chuang, S. L. Huang, and P. S. Yeh, “Super-wideband amplified spontaneous emission generated by double-clad Cr4+: YAG crystal fiber,” CLEO’04, Paper CTuS7, May 16~21, 2004 (San Francisco, CA). [EI]
  [12]   S. L. Huang, C. Y. Lo, K. Y. Huang, J. C. Chen, C. Y. Chuang, C. C. Lai, Y. S. Lin, and P. S. Yeh, “Broadband Cr4+: YAG crystal fiber amplifier,” OSA Topical Meeting: Nonlinear Optics, Postdeadline paper ThD3, Aug. 2-6, 2004 (Waikoloa, HI).
  [13]   K. Y. Huang, C. Y. Lo, S. Y. Tu, S. L. Huang and P. S. Yeh, “Diode array directly pumped Cr:YAG crystal fiber broadband light source,” Advanced Solid-State Photonics, Paper TuB12, Feb. 3-5, 2003 (San Antonio, TX).
  [14]   V. Dominic, S. MacCormack, R. Waarts, S. Sanders, S. Bicknese, R. Dohle, E. Wolak, P. S. Yeh, and E. Zucker, “110W fibre laser,” CLEO’99, Paper CPD11, May 23-28, 1999 (Baltimore, MD). [EI]
  [15]   E. Wolak, S. Bicknese, P. S. Yeh, E. Zucker, X. Y. Hong, R. Dohle, and J. Endriz, “Novel high brightness diode laser source,” CLEO’99, Paper CMI2, May 23-28, 1999 (Baltimore, MD). [EI]
  [16]   B. Li, P. S. Yeh, W. Sha, R. Nagarajan, and R. R. Craig, “High-power, high-speed single mode lasers for optical intersatellite link applications,” Proceedings of SPIE, V. 3266, pp. 49-53, 1998. [EI]
  [17]   B. Li, R. Parke, P. S. Yeh, G. Harnagel, R. Craig, and D. Welch, “Reliability of semiconductor Master Oscillator/Power Amplifier (MOPA) lasers,” SPIE LASE’96, Paper 2683-23, Jan. 27-Feb. 2, 1996 (San Jose, CA). [EI]
  [18]   M. Dagenais, S. H. Cho, P. S. Yeh, S. Fox, R. Prakasam, P. Heim, S. Merritt, C.-C. Lu, V. Vusirikala, B. P. Gopalan, S. Kareenahalli, and C. E. C. Wood, “High-power flared semiconductor laser amplifiers,” (invited paper) Proceedings of SPIE, V. 2397, pp.47-58, 1995. [EI]
  [19]   P. S. Yeh, C.-C. Lu, S. Merritt, P. Heim, S. H. Cho, C. Dauga, S. Fox, C. E. C. Wood, and M. Dagenais, “Angled-facet high-power diffraction-limited tapered semiconductor amplifier,” IEEE LEOS Annual Meeting, Paper SL11.3, pp.399-400, Oct. 31-Nov. 3, 1994 (Boston, MA). [EI]
  [20]   P. S. Yeh, I-F. Wu, S. Jiang and M. Dagenais, “Monolithic integration of a semiconductor preamplifier with a semiconductor tapered power amplifier,” Proceedings of SPIE, V. 2148, pp.116-123, 1994. [EI]
  [21]   P. S. Yeh, I-F. Wu, P. Heim, S. Merritt, S. Jiang, C. E. C. Wood, and M. Dagenais, “Self-aligned dissipating grid for high-power tapered semiconductor amplifiers,” CLEO’94, Paper CWH39, pp. 232-233, May 8-13, 1994 (Anaheim, CA). [EI]
  [22]   P. S. Yeh, I-F. Wu, S. Jiang and M. Dagenais, “35-dB small-signal-gain high-power diffraction-limited tapered semiconductor amplifier,” IEEE LEOS Annual Meeting, Paper SCL6.3, pp. 588-589, Nov. 15-18, 1993 (San Jose, CA). [EI]
  [1]   葉秉慧、邱煜傑、王子勛、周子傑,“警示模組”,中華民國專利發明第I 726583號,自2021年5月1日至2040年1月15日。
  [2]   Ping-hui Yeh, Teng-Po Hsu, and Yen-Chieh Chiu, “OPTOELECTRONIC SEMICONDUCTOR STRUCTURE HAVING A BIPOLAR PHOTOTRANSISTOR STRUCTURE AND MANUFACTURING METHOD THEREOF”, U.S. patent number: 11,011,666 B2, Issued date: May 18, 2021, Expiration date: Aug. 15, 2039.
  [3]   Ping-hui Yeh, Meng-Chun Yu, Jia-Huan Lin and Ching-Chin Huang, “Method to fabricate GaN-based vertical-cavity surface-emitting devices featuring silicon-diffusion defined current blocking layer”, U. S. patent number: 9819152, Issued date: Nov. 14, 2017, Expiration date: Oct. 7, 2035, Assignee: National Taiwan University of Science and Technology.
  [4]   Ping-hui Yeh, Meng-Chun Yu, Jia-Huan Lin and Ching-Chin Huang, “Method to fabricate GaN-based vertical-cavity surface-emitting devices featuring silicon-diffusion defined current blocking layer”, R.O.C. patent no: I 563756.
  [5]   Ping-hui Yeh and Heng-I Lee, “Light Emitting Module and Method for Generating Ultrabroadband Near-Infrared Light”, R.O.C. patent no: I 555290.
  [6]   S. L. Huang, C. Y. Lo, K. Y. Huang, J. C. Chen, C. Y. Chuang, C. C. Lai, Y. S. Lin, and P. S. Yeh, “Transition metal doped fiber amplifier”, R.O.C. patent no: I 315806.
  [7]   S. L. Huang, C. Y. Lo, K. Y. Huang, J. C. Chen, C. Y. Chuang, C. C. Lai, Y. S. Lin, and P. S. Yeh, “Transition metal doped fiber amplifier”, U. S. patent number 7333263, Issued date: February 19, 2008.

Research Achievement
Title Total Amount Conduct From Conduct Until Client
Near infrared broadband fiber light source for medical imaging 10306 10604 MOST
Development of the lateral confinement process for GaN-based surface-emitting lasers 10208 10307 NSC
Investigation of polarization effects on GaN-based solar cells 10108 10207 NSC
Material and device development of InGaN based solar cells(II) 10008 10107 NSC
Material and device development of InGaN based solar cells 9908 10007 NSC
Germination of functional glass-clad crystal fibers 9810 9912 National Science Council
Study on selectively compositional disordering of GaN-based quantum-well materials 9808 9907 National Science Council
All-Fiber Chromium Doped Forsterite Light Sources 9609 9807 National Science Council

Student
Academic Year Thesis Title Student
M.S
Academic Year Thesis Title Student
100 Device modeling and process improvement for minimizing the serial resistance of GaN LED JING-HUANG Chen
100 Simulation of submicron-sphere textured surface for light trapping in thin-film solar cells Bing-ru Yang
99 Study on the current distribution of GaN light emitting diodes with and without current blocking layer and different transparent-conductive-layer material and thicknesses Yen-chao Liao
99 In-rich InGaN thin film growth by metal organic chemical vapor deposition Sheng-han Yang
99 Process Improvement and Characterization of the Transparent Conducting Layer of GaN Devices Ping-Jan Chiang
99 Factors affecting the slope efficiency of Cr:forsterite broadband light source Jynu-lin Wu
98 研製和量測有二氧化矽電流阻擋層的氮化鎵發光二極體 董哲惟
98 氮化鎵元件p型接觸微影製程研發 謝曜聰
97 摻鉻鎂橄欖石晶體光纖製作與特性量測 王先佑
97 Study on GaN/InGaN MQW Solar Cell by simulation kai-yan Zhang
97 Feasibility study on integration of GaN-based LED and solar cells He Huang
Academic Year Project Title Student
Year Deeds