Yuh-Shiuan Liu

**** ********* **. ** ***. **** Atlanta, GA 30318

217-***-**** • ac0wnr@r.postjobfree.com

Education

Georgia Institute of Technology, Atlanta, GA

Expected Graduation Date: Fall 2017

Doctor of Philosophy in Electrical Engineering

Thesis Title: Metalorganic Chemical Vapor Deposition Growth Development for Ultraviolet Vertical-Cavity Surface-Emitting Laser

Georgia Institute of Technology, Atlanta, GA, December 2013 Master of Science in Electrical Engineering

Minor in Material Science & Engineering

Thesis Title: Ultraviolet Emitters Grown by Metalorganic Chemical Vapor Deposition University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, May 2012 Bachelor of Science in Electrical Engineering with Honor Minors in Physics and Mathematics

Thesis Title: Temperature Dependence of Oxygen Deficiency Centers in Glass Optical Fiber Probed by Ultraviolet Absorption and Photoluminescence Spectroscopy

Industry Experience

Test Engineer Internship, Infinera, Allentown, PA, May 2012 to Aug 2012

• Experienced in writing SQL queries and JMP scripts for data analysis.

• Used half of data as training set to developed models for predicting the changes of photonics integrated circuits characteristics after packaging.

• Use the other half of data as test set to assess the performance of the models then utilize it to predict the potential impacts on the test process when the error becomes significant.

• Developed models with R2 value higher than 0.97 based on test set performance evaluation.

• Implemented the algorithms to reduce the test time of modules and for automatic testing process via visual basic (VB). Research Experience

Research Assistant (Directed and funded by Prof. R. D. Dupuis), Advance Material and Device Group, Center for Compound Semiconductor, Georgia Institute of Technology, Atlanta, GA, August 2012 to today.

• Studied High quality AlGaN growth for ultraviolet (UV) injection laser by metalorganic chemical vapor deposition (MOCVD)

• Established III-Nitride based 369 nm vertical cavity surface emitting laser (VCSEL) material growth technology.

• Innovated high quality AlN growth technology on PVD nucleation layer.

• Improved RF performances of III-N based heterojunction bipolar transistors (HBT). Research Assistant (Directed and funded by Prof. J. G. Eden), Laboratory for Optical and Physics Engineering, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, October 2010 to May 2012.

• Characterized YAG, YLF, and ceramic YAG crystals defects with KrF and ArF excimer lasers.

• Advanced solid state laser system with novel host crystals. Research Assistant (Directed and funded by Prof. P.D. Dragic), Coordinated Science Lab, University of Illinois at Urbana- Champaign, Urbana-Champaign, IL, June 2010 to May 2012.

• Characterized oxygen deficiency center (II) or ODC(II) in ultraviolet spectral range and investigate all the possible energy transfer between defects and gain material in fiber laser system.

• Investigated the origin of photodarkening phenomenon in Yb-doped fiber laser system.

• Characterized Stimulated Brillouin Scattering of fiber with various dopants at different temperature.

• Developed low SBS threshold fiber laser system.

Teaching Experience

Computing Systems Engineering Lab Assistant (ECE391 – Computer System Engineering), Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, January 2011 to May 2012

• Answered questions associated with operating systems, C, and x86 assembly language during scheduled office hour.

• Helped students to debug their code with the GDB debugging tool and graded their machine problems.

• Composed questions, proctored, and graded for midterm and final exams. Calculus & Mathematica Class Assistant (Math286 – Intro. to Diffeq. Plus), Department of Mathematics, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, Spring 2010

• Graded students’ homework and answered questions about differential equations & Mathematica coding in scheduled office hour. Skills

• Data Analysis: MatLab, SQL, Mathematica, JMP

• Software: FPGA, C, Java, x86 Assembly, VB.NET

• III-N Material: MOCVD Growth, Characterizations (AFM, EL, Hall, PL, SEM, SIMS, XRD), Fabrication (E-beam, RTA)

• Fiber Optics: Splicing, Recoating, and Optical System Setup

• Laser Operations and Alignment: Ti:Sapphire, Nd:YAG, Excimer, Fiber Lasers, Laser Diode Academic Honors

SPIE Optics and Photonics Education Scholarship, Society of Photographic Instrumentation Engineers (SPIE), 2013 Steve W. Chaddick Fellowship, Department of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, August 2012 – December 2016.

Timothy N. Trick Leadership Award, Department of Electrical and Computer Engineering, University of Illinois at Urbana- Champaign, Urbana-Champaign, IL, 2012

1st place in Operating System Design Competition (Sponsored by Microsoft), Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, Fall 2010. Edmund J James Scholars, College of Engineering, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, 2009 – 2012.

Selected Refereed Journal Publications

1. P.-C. Law, Y.-S. Liu, A. C., and P. D. Dragic, “Acoustic coefficients of P2O5-doped Silica Fiber: Acoustic Velocity, Acoustic Attenuation, and Thermo-Acoustic coefficient,” Opt. Mater. Express, Vol.1, pp.686-699 (2011). 2. Y.-S. Liu, T. Galvin, T. Hawkins, J. Ballato, L. Dong, P. R. Foy, P. D. Dragic, and J. G. Eden, “Linkage of Oxygen Deficiency Defects and Rare Earth Concentrations in Glass Optical Fiber Probed by Ultraviolet Absorption and Laser Excitation Spectroscopy,” Opt. Express, Vol. 20, pp. 144**-***** (2012). 3. (Invited) P. D. Dragic, Y.-S. Liu, T. Galvin, and J. G. Eden, “Ultraviolet absorption and excitation spectroscopy of rare-earth- doped glass fibers derived from glassy and crystalline preforms,” Proc. SPIE, Vol. 8237, 82370T (2012). 4. P. D. Dragic, P.-C. Law, and Y.-S. Liu, “Higher-Order Modes in Acoustically Antiguiding Optical Fiber,” Microw. Opt. Technol. Lett., Vol. 54, pp. 2347-2349 (2012).

5. Z. Lochner, T.-T. Kao, Y.-S. Liu, X.-H. Li, M. M. Satter, S.-C. Shen, P. D. Yoder, J.-H. Ryou, R. D. Dupuis, Y. Wei, H. Xie, A. Fischer, and F. A. Ponce, “Deep-Ultraviolet Lasing at 243 nm from Photo-Pumped AlGaN/AlN Heterostructure on AlN Substrate,” Appl. Phys. Lett., Vol. 102, pp. 101110 (2013). 6. T.-T. Kao, Y.-S. Liu, M. M. Satter, X.-H. Li, Z. Lochner, J.-H. Ryou, P. D. Yoder, T. Detchprohm, R. Dupuis, S.-C. Shen, Y. Wei, H. Xie, A. Fischer, and F. A. Ponce, “Sub-250 nm, Low-Threshold Deep-Ultraviolet AlGaN-based Heterostructure Laser Employing HfO2/SiO2 Dielectric Mirrors,” Appl. Phys. Lett., Vol. 103, pp. 211103 (2013). 7. (Invited) Y.-S. Liu, T.-T. Kao, M. M. Satter, Z. Lochner, X.-H. Li, S.-C. Shen, P. D. Yoder, T. Detchprohm, R. D. Dupuis, Y. Wei, H. Xie, A. Fischer, and F. Ponce, “Optically-pumped deep-ultraviolet AlGaN multi-quantum-well lasers grown by metalorganic chemical vapor deposition,” Proc. SPIE, Vol. 9002, 90020H (2014). 8. M. M. Satter, Z. Lochner, T.-T. Kao, Y.-S. Liu, X.-H. Li, S.-C. Shen, R. D. Dupuis, and P. D. Yoder, “AlGaN-Based Vertical Injection Laser Diodes using Inverse Tapered P-waveguide for Efficient Hole Transport,” IEEE J. Quantum Electron., Vol. 50, pp. 166 (2014).

9. Y.-S. Liu, T.-T. Kao, M. M. Satter, Z. Lochner, S.-C. Shen, T. Detchprohm, P. D. Yoder, R. D. Dupuis, J.-H. Ryou, A. Fischer, Y. Wei, H. Xie, and F. A. Ponce, “Inverse-Tapered P-Waveguide for Vertical Hole Transport in High-[Al] AlGaN Emitters,” IEEE Photon. Technol. Lett., Vol. 27, pp. 1768 (2015). 10. Y.-S. Liu, A F M S. Haq, T.-T. Kao, K. Mehta, S.-C. Shen, T. Detchprohm, P. D. Yoder, R. D. Dupuis, H. Xie, and F. A. Ponce, “Electrically Conducting n-type AlGaN/GaN Distributed Bragg Reflectors Grown by Metalorganic Chemical Vapor Deposition,” J. Cryst. Growth, Vol. 443, 81 (2016). 11. Y.-S. Liu, S. Wang, H. Xie, T.-T. Kao, K. Mehta, X. Jia, S.-C. Shen, P. D. Yoder, F. A. Ponce, T. Detchprohm, and R. D. Dupuis, “Strain Management of AlGaN-Based Distributed Bragg Reflectors with GaN Interlayer Grown by Metalorganic Chemical Vapor Deposition,” Appl. Phys. Lett., Vol. 109, 081103 (2016). 12. Y.-S. Liu, A F M S. Haq, K. Mehta, T.-T. Kao, S. Wang, H. Xie, S.-C. Shen, P. D. Yoder, F. A. Ponce, T. Detchprohm, and R. D. Dupuis, “Optically Pumped Vertical-Cavity Surface-Emitting Laser at 374.9 nm with an electrically conducting n-DBR,” Appl. Phys. Express., Vol. 9, 111002 (2016).

13. T. Detchprohm, Y.-S. Liu, K. Mehta, S. Wang, H. Xie, T.-T. Kao, S.-C. Shen, P. D. Yoder, F. A. Ponce, and R. D. Dupuis.

“Sub 250nm Deep-UV AlGaN/AlN Distributed Bragg Reflectors,” Appl. Phys. Lett., Vol. 110, 011105 (2017). Invited Referred Conference Presentation

1. (Invited) P. D. Dragic, Y.-S. Liu, T. Galvin, and J. G. Eden, “Ultraviolet absorption and excitation spectroscopy of rare-earth- doped glass fibers derived from glassy and crystalline preforms,” 2012 SPIE Photonics West, San Francisco, CA (January 2012).

2. (Invited) Y.-S. Liu, T.-T. Kao, M. M. Satter, Z. Lochner, X.-H. Li, S.-C. Shen, P. D. Yoder, T. Detchprohm, R. D. Dupuis, Y. Wei, H. Xie, A. Fischer, and F. Ponce, “Optically-pumped deep-ultraviolet AlGaN multi-quantum-well lasers grown by metalorganic chemical vapor deposition,” 2014 SPIE Photonics West, San Francisco, CA (February 2014). 3. (Invited) R. D. Dupuis, Y.-S. Liu, X.-H. Li, J. Kim, M.-H. Ji, T. Detchprohm, T.-T. Kao, S.-C. Shen, A. Fischer, and F. Ponce, “Wide-Bandgap III-N Ultraviolet Light Emitters and Power Electronic Devices,” 43rd Jaszowiec International School and Conference on the Physics of Semiconductors, Wista, Portland (June 2014). 4. (Invited) J. Kim, M.-H. Ji, Y.-S. Liu, T. Detchprohm, R. D. Dupuis, T.-T. Kao, S. Haq, S.-C. Shen, K. Mehta, P. D. Yoder, H. Xie, F. A. Ponce, A. Sood, and N. Dhar, “ Growth and Characterization of III-N Ultraviolet Lasers and Avalanche Photodiodes by MOCVD, “ ICNS-11, Beijin, China (August-September 2015). 5. (Plenary) R. D. Dupuis, J. Kim, M.-H. Ji, Y.-S. Liu, T. Detchprohm, T.-T. Kao, S.-C. Shen, K. Mehta, P. D. Yoder, H. Xie, F. A. Ponce, A. Sood, and N. Dhar, “ Growth and Characterization of III-N Ultraviolet Lasers and Avalanche Photodiodes by MOCVD, “ ISGN-6, Hamamatsu, Japan (November 2015). 6. (Invited) R. D. Dupuis, M.-H. Ji, Y.-S. Liu, J. Kim, Y. Park, T. Detchprohm, T.-T. Kao, S.-C. Shen, K. Mehta, P. D. Yoder, H. Xie, F. A. Ponce, A. Sood, N. Dhar, and J. Lewis, ” Growth and Characterization of III-N Ultraviolet Lasers and Avalanche Photodiodes by MOCVD,” CLEO 2017, San Jose, CA (May 2017). 7. (Plenary) Y.-J. Park, M.-H. Ji, Y.-S. Liu, J. Kim, T. Detchprohm, R. D. Dupuis, O. Moreno, B. Chaiyasarikul, S.-C. Shen, K. Mehta, P. D. Yoder, H. Xie, F. A. Ponce, A. Sood, and N. Dhar, “ Growth and Characterization of III-N Ultraviolet Vertical-Cavity Surface-Emitting Lasers and Avalanche Photodiodes by MOCVD, “ OMVPE XIX, Nara, Japan (July 2018).

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