# Constance Chang-Hasnain

### Research Areas

- Micro/Nano Electro Mechanical Systems (MEMS)
- Physical Electronics (PHY)
- Nano-Optoelectronic devices
- Microsystems and materials

### Research Centers

- Center for Energy Efficient Electronics Science (E3S)
- Center for Integrated Access Networks (CIAN)
- Tsinghua-UC Berkeley Shenzhen Institute (TBSI)

## Biography

Connie Chang-Hasnain is John R. Whinnery Chair Professor Emerita of Electrical Engineering and Computer Sciences, University of California, Berkeley. She was Associate Dean for Strategic Alliances, College of Engineering, 2014-2019 and Chair of Nanoscale Science and Engineering Graduate Group, 2006-2017. She received her Ph.D. from the same university in 1987. Prior to joining the Berkeley faculty, Dr. Chang-Hasnain was a member of the technical staff at Bellcore (1987â1992), and Assistant and Associate Professor of Electrical Engineering at Stanford University (1992â1996).

Professor Chang-Hasnainâs research interests range from semiconductor optoelectronic devices to materials and physics. She has been honored with the Welker Award (2022) for For pioneering contributions to VCSEL photonics, nano-photonics and high contrast metastructures for optical communications and optical sensing, the Okawa Prize (2018) for pioneering and outstanding research of VCSEL photonics through the development of their novel functions for optical communications and optical sensing. In addition, she has been awarded with the Quantum Device Award (2014), IEEE David Sarnoff Award (2011), the OSA Nick Holonyak Jr. Award (2007), the IEEE LEOS William Streifer Award for Scientific Achievement (2003), the Microoptics Award from Japan Society of Applied Physics (2009), a Humboldt Research Award (2009), and a Guggenheim Fellowship (2009).

She is an elected member of National Academy of Engineering, a member of the US Advisory Committee to the International Commission on Optics, National Academy of Sciences. She was the Editor-in-Chief Journal of Lightwave Technology 2007-2012 and is Associate Editor of the OSA Optica, since 2013.

She was the President of Optica (formerly know as OSA) in 2021 and Past President in 2022.

## Education

- 1987, Ph.D., Electrical Engineering, U.C. Berkeley
- 1984, M.S., Electrical Engineering, U.C. Berkeley
- 1982, B.S., Electrical Engineering, U.C. Davis

## Selected Publications

- K. W. Ng, W. S. Ko, F. Lu, and C. Chang-Hasnain, "Metastable Growth of Pure Wurtzite InGaAs Microstructures," Nano Letters, vol. 14, no. 8, pp. 4757–4762, July 2014.
- R. Chen, K. W. Ng, W. S. Ko, D. Parekh, F. Lu, T. D. Tran, K. Li, and C. Chang-Hasnain, "Nanophotonic integrated circuits from nanoresonators grown on silicon," Nature communications, vol. 5, no. 4325, July 2014.
- W. Yang, J. Ferrara, K. Grutter, A. Yeh, C. Chase, Y. Yue, A. E. Willner, M. C. Wu, and C. Chang-Hasnain, "Low loss hollow-core waveguide on a silicon substrate," Nanophotonics, vol. 1, no. 1, pp. 23--29, Jan. 2012.
- Y. Zhou, M. C. Y. Huang, and C. Chang-Hasnain, "Tunable VCSEL with ultra-thin high contrast grating for high-speed tuning," Optics Express, vol. 16, no. 18, pp. 14221-14226, Sep. 2008.
- M. Moewe, L. C. Chuang, V. G. Dubrovskii, and C. Chang-Hasnain, "Growth mechanisms and crystallographic structure of InP nanowires on lattice-mismatched substrates," J. Applied Physics, vol. 104, no. 4, pp. 044313-1-4, Aug. 2008.
- M. C. Y. Huang, K. B. Cheng, Y. Zhou, A. Pisano, and C. Chang-Hasnain, "Monolithic integrated piezoelectric MEMS-tunable VCSEL," IEEE J. Selected Topics in Quantum Electronics, vol. 13, no. 2, pp. 374-380, March 2007.
- E. Wong, X. Zhao, C. Chang-Hasnain, W. Hofmann, and M. C. Amann, "Rayleigh backscattering and extinction ratio study of optically injection-locked 1.55 mu m VCSELs," Electronics Letters, vol. 43, no. 3, pp. 182-183, Feb. 2007.
- R. S. Tucker, P. Ku, and C. Chang-Hasnain, "Slow-light optical buffers: capabilities and fundamental limitations," J. Lightwave Technology, vol. 23, no. 12, pp. 4046-4066, Dec. 2005.
- C. F. R. Mateus, M. C. Y. Huang, Y. Deng, A. R. Neureuther, and C. Chang-Hasnain, "Ultrabroadband mirror using low-index cladded subwavelength grating," IEEE Photonics Technology Letters, vol. 16, no. 2, pp. 518-520, Feb. 2004.
- B. T. Cunningham, P. Y. Li, C. Chang-Hasnain, and C. Mateus, "Detection of biochemical interactions on a biosensor using tunable filters and tunable lasers," U.S. Patent Application. May 2003.
- C. Chang-Hasnain, "Tunable VCSEL," IEEE J. Selected Topics in Quantum Electronics, vol. 6, no. 6, pp. 978-987, Nov. 2000.
- W. Yuen, G. S. Li, R. F. Nabiev, J. Boucart, P. Kner, R. J. Stone, D. Zhang, M. Beaudoin, T. Zheng, C. He, K. Yu, M. Jansen, D. P. Worland, and C. Chang-Hasnain, "High-performance 1.6-mu m single-epitaxy top-emitting VCSEL," Electronics Letters, vol. 36, no. 13, pp. 1121-1123, June 2000.
- C. J. Chang-Hasnain, E. C. Vail, and M. S. Wu, "High performance micromechanical tunable vertical cavity surface emitting laser," U.S. Patent 5,771,253. June 1998.
- E. C. Vail, M. S. Wu, G. S. Li, L. Eng, and C. Chang-Hasnain, "GaAs micromachined widely tunable Fabry-Perot filters," Electronics Letters, vol. 31, no. 3, pp. 228-229, Feb. 1995.
- C. Chang-Hasnain, J. P. Harbison, G. Hasnain, A. C. Von Lehmen, L. T. Florez, and N. G. Stoffel, "Dynamic, polarization, and transverse mode characteristics of vertical cavity surface emitting lasers," IEEE J. Quantum Electronics, vol. 27, no. 6, pp. 1402-1409, June 1991.
- C. Chang-Hasnain, J. Berger, D. R. Scifres, W. Streifer, J. R. Whinnery, and A. Dienes, "High power with high efficiency in a narrow single-lobed beam from a diode laser array in an external cavity," Applied Physics Letters, vol. 50, no. 21, pp. 1465-1467, May 1987.
- C. Chang-Hasnain, D. F. Welch, D. R. Scifres, J. R. Whinnery, A. Dienes, and R. D. Burnham, "Diffraction-limited emission from a diode laser array in an apertured graded-index lens external cavity," Applied Physics Letters, vol. 49, no. 11, pp. 614-616, Sep. 1986.

## Awards, Memberships and Fellowships

- Nick Holonyak Jr. Medal for Semiconductor Optoelectronics Technologies, 2024
- Welker Award, 2022
- ECE Distinguished Alumni Award, 2019
- National Academy of Inventors (NAI) Fellow, 2018
- Okawa Prize, 2018
- National Academy of Engineering (NAE) Member, 2018
- UNESCO Medal for the Development of Nanosciences and Nanotechnologies, 2015
- Quantum Device Award, 2014
- Pan Wen-Yuan Foundation Outstanding Research Award, 2013
- IEEE David Sarnoff Award, 2011
- Max Planck Research Award, 2009
- Guggenheim Fellow, 2009
- Microoptics Award, 2009
- Humboldt Research Award, 2009
- National Security Science and Engineering Faculty (NSSEF) Fellow, 2008
- Nick Holonyak Jr. Award, 2007
- NAE Gilbreth Lectureship, 2005
- IEEE Photonics Society William Streifer Scientific Achievement Award, 2003
- James H. McGraw Award, 1999
- Institute of Electrical & Electronics Engineers (IEEE) Fellow, 1997
- Optica Fellows (formerly Optical Society of America (OSA) Fellow), 1997
- NSF Presidential Faculty Fellow (PFF), 1994
- Sloan Research Fellow, 1994
- IEEE Photonics Society Distinguished Lecturer, 1994
- Packard Fellow in Science and Engineering, 1992
- IEEE-HKN Outstanding Young Professional Award, 1991