Christopher Lalau-Keraly is a PhD candidate in electrical engineering at UC Berkeley studying nanophotonics. He has developed optimization software for nanophotonic devices using simulation tools and has studied phototransistors to enhance photoreceiver sensitivity. He has designed, fabricated, and characterized photoreceivers in the Berkeley cleanroom. He has published journal articles and conference papers on topics including shape optimization and photodetector design.

1. Christopher Lalau-Keraly
2614 Dana Street - Berkeley, CA 94704
(805) 453 5184 - chriskeraly@gmail.com
Education
2011- Present PhD - Electrical Engineering (Optoelectronics), UC Berkeley, GPA – 3.9.
Expected graduation: summer 2016, Advisor: Eli Yablonovitch
2008–2011 Diplome de l’Ecole Polytechnique, Ecole Polytechnique, Paris.
Bachelor’s and Master’s equivalent in Physics and Mathematics
Research Experience
2011-2016 PhD Work: Optimizing Nanophotonics: from Waveguides to Phototransistors,
UC Berkeley, Advisor: Eli Yablonovitch.
Developed optimization software for nanophotonic components using adjoint based methods
and FDTD simulation tools focusing on silicon photonic devices and applications.
Studied bipolar phototransistors to enhance the sensitivity of optical front ends in photore-
ceiver systems using analytical and simulation methods. Derived fundamental sensitivity
limits and proposed new device topologies enabling the decoupling of gain and absorption
mechanisms.
Designed, fabricated, and characterized photoreceivers in the Berkeley cleanroom facilities
(10 mask process).
April-July
2011
Optical modeling and characterization of luminescent systems: LEDs, phos-
phors, and their coupling,
UC Santa Barbara, Advisor: Claude Weisbuch.
Studied chip shaping for LEDs to improve light extraction efficiency and phosphors for white
LEDs and efficient color mixing using raytracing software
Work Experience
2011–Present Graduate Student Researcher, UC Berkeley, Berkeley, (See above).
2011, 2015 Graduate Student Instructor, UC Berkeley, Berkeley.
EE40: Introduction to Microelectronic Circuits, Lab sections
EE117: Electromagnetic Fields and Waves , Discussion sections
Dec 2008
-April 2009
Officer of the watch, French Navy patrol boat "La Rieuse", La Reunion.
Responsible for navigation and activities on board the ship during missions. Handled a small
team in order to ensure the ship’s security. Organized the activities at sea, according to the
captain’s orders.
Awards
2013 Tong Leong Lim Pre-Doctoral Prize, Rewards highest distinction in the pre-doctoral
examination, (1 awarded per year in the EE department).
2010 Grand Prix du Stage de recherche, Rewards exceptional research achievement for
research internships, (5 awarded campus-wide).
2008 Full merit scholarship for the Ecole Polytechnique, (400 awarded out of 5000).
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2. Publications
Journal
2013 C. Lalau-Keraly, S Bhargava, O. Miller, E. Yablonovitch,"Adjoint shape optimization
applied to electromagnetic design", Optics Express Vol 21, No. 18 (2013)
2012 S.Brinkley, C. Lalau-Keraly, Junichi Sonoda, C. Weisbuch, J. Speck, S. Nakamura,
S. DenBaars, "Chip Shaping for Light Extraction Enhacement of Bulk c-Plane Light-
Emitting Diodes", Applied Physics Express 5 (2012)
Conference proceedings
2015 C. Lalau-Keraly, R.Going, M. Wu, E. Yablonovitch, "Ultra-sensitive detector for
Silicon Photonics; a photodiode incorporating integrated bipolar gain", In Photonics
Conference (IPC) (pp. 429-430). IEEE. (2015)
2015 C. Lalau-Keraly, R.Going, M. Wu, E, Yablonovitch, "Photo Detection for Quantum
Limit Operation of Optical links" 4th E3S Symposium (2015)
2015 R. Going, C. Lalau-Keraly, T-J. Seok, E. Yablonovich, M. Wu. "32 GHz germanium
bipolar phototransistors on silicon photonics", Optical Interconnects Conference, pp.
38-39 IEEE, (2015).
2014 C. Lalau-Keraly, S. Bhargava, V. Ganapati, G. Scranton, E. Yablonovitch, "Shape
Optimization of Nanophotonic Devices Using the Adjoint Method", CLEO (2014)
2014 N. Quack, B. Behroozpour, J. Ferrara, A. Gerke, S. Han, C. Lalau-Keraly, P. Qiao et
al. "Development of a FMCW LADAR Source Chip Using MEMS-Electronic-Photonic
Heterogeneous Integration", In GOMACTech, no. EPFL-TALK-209891. 2014.
Book Chapter
2013 C. Lalau-Keraly, L. Kuritzky, M. Cochet, and C. Weisbuch. "Light Extraction
Efficiency Part A. Ray Tracing for Light Extraction Efficiency (LEE) Modeling in
Nitride LEDs", In III-Nitride Based Light Emitting Diodes and Applications, pp. 231-
269. Springer Netherlands, (2013)
Patents
2012 J. Speck, C. Weisbuch, N. Pfaff, L. Kuritzky, C. Lalau-Keraly. "Light emitting
diode with conformal surface electrical contacts with glass encapsulation", U.S. Patent
Application 13/623,472, filed September 20, 2012.
Skills
Computer Matlab, Lumerical, Sentaurus, Cadence virtuoso, LightTools, COMSOL, L-edit, Labview
Languages English and French: bilingual native speaker, German and Spanish: Intermediate
Fabrication UV Lithography, RIE etching, Plasma etching, LPCVD, SEM, Confocal microscope,
Ellipsometer
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