Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M56: Collective Modes and Optical Nonlinearities in Graphene
8:00 AM–11:00 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Burnham
Sponsoring
Unit:
DCMP
Chair: Ken Burch, Boston College
Abstract: M56.00013 : Theoretical Modeling of Collective Mode Effects in Photocurrent Nanoscopy
10:24 AM–10:36 AM
Presenter:
Andrey A Rikhter
(UC San Diego)
Authors:
Andrey A Rikhter
(UC San Diego)
Michael M Fogler
(University of California, San Diego)
Dmitri N Basov
(Columbia University)
Scanned probes techniques have also been employed for measuring photocurrent response with nanoscale resolution.
We develop a model that describes the latter class of measurements.
The model includes three typical photocurrent generation mechanisms: photothermal, photovoltaic, and bolometric.
The relative strength of these mechanisms depends on frequency, temperature, applied bias, and sample geometry, so that any of them can dominate under certain conditions.
Our model is able to account for plasmonic and polaritonic interference patterns observed near sample edges and inhomogeneities.
We also compare the frequency dependence of the photocurrent with the signal obtained from another scanning technique, scattering-type near-field optical microscopy (s-SNOM).
We find a simple relation, analogous to the optical theorem, that connects the two for the case of a weakly absorbing substrate.
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