HQOC/ITAMP Joint Quantum Sciences Seminar
Wednesday, September 19th, 4:00 PM, J250
Guest Presenter: Prof. Mark Brongersma, Stanford University
"Electrically Driven Plasmonic Nanocircuits"
Abstract:
The laser has long been established as the best possible optical source
for fundamental studies and applications requiring high field intensity,
single-mode operation, a high degree of coherence, a narrow linewidth
and short pulses. This notion is worth reanalyzing for chipscale
optoelectronic systems that impose severe constraints on the power
efficiency and footprint of optical sources. Recent work has
demonstrated the exciting possibility to shrink lasers to nanoscale
dimensions with the use of metals. Unfortunately, smaller cavities tend
to exhibit increased optical losses that make the realization of
power-efficient, electrically-pumped nanolasers at room temperature
extremely challenging. I will describe experimental realizations of
electrically-driven, metal-clad nano-light-emitting-diodes that offer a
practical alternative to chipscale nanolasers by exploiting the Purcell
effect to facilitate efficient emission into a single mode waveguide
with a cross-sectional area of 0.016?^2 and to allow for fast optical
modulation. With this source, electrically-driven subwavelength optical
nano-circuits for routing, splitting, free-space coupling, and
directional coupling can be realized. I will discuss the basic physics
and engineering challenges in realizing these circuits and discuss our
first results.
Student Presenter: Tsung-Li Liu, Hu Lab
"Deterministically Defined Plasmonic Nanocavities"
--
Joan Hamilton
Faculty Assistant to Profs. Lukin and Greiner
HQOC Administrative Coordinator
Harvard University
Department of Physics
17 Oxford Street
Cambridge, Ma 02138
Phone 617-496-2544
HUCTW Local Representative for the Department of Physics
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