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Antenna Enhanced Graphene THz Emitter and Detector
journal contribution
posted on 2015-08-12, 00:00 authored by Jiayue Tong, Martin Muthee, Shao-Yu Chen, Sigfrid K. Yngvesson, Jun YanRecent intense electrical and optical
studies of graphene have pushed the material to the forefront of optoelectronic
research. Of particular interest is the few terahertz (THz) frequency
regime where efficient light sources and highly sensitive detectors
are very challenging to make. Here we present THz sources and detectors
made with graphene field effect transistors (GFETs) enhanced by a
double-patch antenna and an on-chip silicon lens. We report the first
experimental observation of 1–3 THz radiation from graphene,
as well as more than 3 orders of magnitude performance improvements
in a half-edge-contacted GFET thermoelectric detector operating at ∼2
THz. The quantitative analysis of the emitting power and its unusual
charge density dependence indicate significant nonthermal noise contribution
from the GFET. The polarization resolved detection measurements with
different illumination geometries allow for detailed and quantitative
analysis of various factors that contribute to the overall detector
performance. Our experimental results represent a significant advance
toward practically useful graphene THz devices.
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Antenna Enhanced Graphene THz Emittermagnitude performance improvementsillumination geometriescharge density dependenceGFETlight sourcesgraphene THz devicesgraphene field effect transistorsnonthermal noise contributionTHz sources3 ordersoptoelectronic researchdetector performancedetection measurementsfrequency regime
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