Faculty

Pinghui Sophia Yeh Associate Professor
photo
Position
Associate Professor
Education
Ph.D., University of Maryland, College Park, Maryland 
E-mail
pyeh@mail.ntust.edu.tw
Room
T2-504-2
Office hour
Mon. 2~4 p.m. and Tu. 10:20~11:50 a.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

Record
2015.02
~
present 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.
Honor & Awards
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

Research Achievement
Journal
[1] 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]
[2] 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]
[3] 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]
[4] 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]
[5] 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]
[6] 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]
[7] 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]
[8] 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]
[9] 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]
[10] 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]
[11] 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]
[12] 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]
[13] 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]
Conference
[1] 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.
[2] 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)
[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]
Patent
[1] 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.
[2] 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.
[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”, R.O.C. patent no: I 563756.
[4] 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.
[5] 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.
Book
Other

Project
Title Total Amount Excution Duration Client
Material and device development of InGaN based solar cells 99 - 100 NSC
Study on selectively compositional disordering of GaN-based quantum-well materials 98 - 99 National Science Council
Germination of functional glass-clad crystal fibers 98 - 99 National Science Council
All-Fiber Chromium Doped Forsterite Light Sources 96 - 98 National Science Council
Near infrared broadband fiber light source for medical imaging 103 - 106 MOST
Development of the lateral confinement process for GaN-based surface-emitting lasers 102 - 103 NSC
Investigation of polarization effects on GaN-based solar cells 101 - 102 NSC
Material and device development of InGaN based solar cells(II) 100 - 101 NSC

Student
Ph.D
M.S
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
Student's Project
Student's Honor