EE PhD Oral Examination -- Kelley Rivoire, Fri. Jan 20, 2 pm, Nano 232

Kelley Rivoire krivoire at stanford.edu
Tue Jan 17 16:44:51 PST 2012


Stanford University PhD Oral Defense - Department of Electrical Engineering

Title: Nonlinear frequency conversion in III-V semiconductor photonic crystals
Speaker: Kelley Rivoire
Advisor: Jelena Vuckovic

Date: Friday, Jan. 20, 2012
Time: 2 pm (refreshments served at 1:45 pm)
Location: Nano Building, room 232

Abstract:

Nonlinear optical processes provide a physical mechanism for
converting the frequency of light. This allows the generation of
tunable light sources at wavelengths inaccessible with lasers, leading
to a diverse set of applications in fields such as spectroscopy,
sensing, and metrology. To make these processes efficient has
conventionally required relatively exotic materials that are
incompatible with state of the art nanofabrication, resulting in
large-area devices that operate at high optical powers and cannot be
integrated with on-chip optical and electronic circuits.

In this talk, I will show how optical nanocavities, by localizing
light into sub-cubic optical wavelength volumes with long photon
storage times, can greatly enhance the efficiency of nonlinear
frequency conversion processes in III-V semiconductors, while
simultaneously shrinking the device footprint, reducing the operating
power, and providing a scalable on-chip platform. This approach also
enables on-chip quantum frequency conversion interfaces, which are
crucial for the construction of quantum networks. I will first
describe how photonic crystal nanocavities in gallium phosphide can
generate second harmonic radiation with only nanowatts of coupled
optical powers, and efficiency many orders of magnitude greater than
in previous nanoscale devices. We extend this approach to demonstrate
sum-frequency generation in GaP photonic crystal cavities with
multiple cavity modes, as well as broadband upconversion employing
photonic crystal waveguides. I will then discuss how we can integrate
nanocavity-enhanced second harmonic generation with a single quantum
dot to create a single photon source triggered at 300 MHz by a
telecommunication wavelength laser coupled with an external
electro-optic modulator, a simpler and faster configuration than
standard approaches. Finally, I will present the design and
characterization of multi-resonant photonic crystal nanocavities with
large frequency separation that can further reduce the powers of all
of the aforementioned processes.



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