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Title: Coherent and tunable terahertz radiation from graphene surface plasmon polaritons excited by an electron beam

Although surface plasmon polaritons (SPPs) resonance in graphene can be tuned in the terahertz regime, transforming such SPPs into coherent terahertz radiation has not been achieved. Here, we propose a graphene-based coherent terahertz radiation source with greatly enhanced intensity. The radiation works at room temperature, it is tunable and can cover the whole terahertz regime. The radiation intensity generated with this method is 400 times stronger than that from SPPs at a conventional dielectric or semiconducting surface and is comparable to that from the most advanced photonics source such as a quantum cascade laser. The physical mechanism for this strong radiation is presented. The phase diagrams defining the parameters range for the occurrence of radiation is also shown.
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Terahertz Research Centre, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054 (China)
  2. (China)
  3. (Australia)
Publication Date:
OSTI Identifier:
22273373
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIELECTRIC MATERIALS; ELECTRON BEAMS; GRAPHENE; LASERS; PHASE DIAGRAMS; POLARONS; RADIATION SOURCES; RESONANCE; SURFACES; TEMPERATURE RANGE 0273-0400 K