CUED Publications database

Graphene field-effect transistors as room-temperature terahertz detectors

Vicarelli, L and Vitiello, MS and Coquillat, D and Lombardo, A and Ferrari, AC and Knap, W and Polini, M and Pellegrini, V and Tredicucci, A (2012) Graphene field-effect transistors as room-temperature terahertz detectors. Nature Materials, 11. pp. 865-871. ISSN 1476-1122

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Abstract

The unique optoelectronic properties of graphene make it an ideal platform for a variety of photonic applications, including fast photodetectors, transparent electrodes in displays and photovoltaic modules, optical modulators, plasmonic devices, microcavities, and ultra-fast lasers. Owing to its high carrier mobility, gapless spectrum and frequency-independent absorption, graphene is a very promising material for the development of detectors and modulators operating in the terahertz region of the electromagnetic spectrum (wavelengths in the hundreds of micrometres), still severely lacking in terms of solid-state devices. Here we demonstrate terahertz detectors based on antenna-coupled graphene field-effect transistors. These exploit the nonlinear response to the oscillating radiation field at the gate electrode, with contributions of thermoelectric and photoconductive origin. We demonstrate room temperature operation at 0.3 THz, showing that our devices can already be used in realistic settings, enabling large-area, fast imaging of macroscopic samples. © 2012 Macmillan Publishers Limited. All rights reserved.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 20 Dec 2014 19:02
DOI: 10.1038/nmat3417