Dear group,
Tomorrow we will have a guest speaker, Frank Koppens, who is doing a joint
post-doc with Honkung Park and Michael Lukin. Please see the title and
abstract of his talk below. See you all at 1:30pm in Converse 204.
*Near-field Electrical Detection of Optical Plasmons and Single Plasmon
Sources*
Photonic circuits based on surface plasmons (SPs) are promising for the
integration with nanoscale electronic circuits because they can be
miniaturized below the optical wavelength scale. Moreover, the strong field
confinement of SPs can be used to significantly modify the emission
properties of individual emitters, which allows for single light quanta to
be controlled. Such control has potential applications such as efficient
photon collection, single-photon switching and long-range optical coupling
of quantum bits.
However, there is a general tradeoff between the localization of an SP and
the efficiency with which it can be detected with conventional far-field
optics. To address this issue, we integrated a plasmonic waveguide with a
nanoscale transistor, and demonstrated all-electrical SP detection in the
near-field. Moreover, we show that the emission from a single-photon emitter
can be directed very efficiently into SPs that propagate along a metallic
wire. We used this strong coupling to perform all-electrical detection of
the plasmon emission from an individual colloidal quantum. These results
enable new on-chip optical sensing applications and fulfill a key
requirement for “dark” electroplasmonic nanocircuits, in which SPs can be
generated, manipulated, and detected without involving far-field radiation.
--
Alejandro Perdomo
Ph.D. Candidate in Chemical Physics.
Harvard University
12 Oxford St #482, Cambridge, MA, 02138.
perdomo(a)fas.harvard.edu
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