Department: Electrical & Computer Engineering
Faculty Advisor(s): Yeshaiahu (Shaya) Fainman
Award(s): Honorable Mention

Primary Student
Name: Qing Gu
Email: qigu@ucsd.edu
Phone: 858-534-4826
Grad Year: 2013

Student Collaborators
Olesya Bondarenko, bondaren@ece.ucsd.edu | Brett Wingad, bwingad@ucsd.edu | Rick Delhommer, rdelhommer@gmail.com

Achieving the most compact footprint for photonic components is an important factor in the design of integrated optical devices. Radiative losses in conventional dielectric lasers, as well as dissipation losses in metallic resonators, limit their size by increasing the gain threshold requirements. One way to overcome these limitations is to scale down one dimension at the cost of other two. Another way is to operate at cryogenic temperatures. The ultimate challenge in this respect is to reduce the size of the resonator in all three dimensions, while still satisfying the lasing requirements at room temperature. By incorporating a dielectric shield layer between the metal and the semiconductor gain core, we demonstrate room temperature laser emission from optically pumped silicon compatible metallo-dielectric cavities that are smaller than their emission wavelength in all three dimensions. The sub-wavelength lasers are hybrid devices integrating III-V gain with silicon, and is of great importance for creating entirely integrated silicon photonic circuit, and a big step towards integration with CMOS platform.

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