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

Journal Article · Mon May 19 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4879017· OSTI ID:22273373

Liu, Shenggang; Hu, Min; Chen, Xiaoxing; Zhang, Ping; Gong, Sen; Zhao, Tao; Zhong, Renbin ^[1]; Zhang, Chao ^[1]

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1. Terahertz Research Centre, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054 (China)

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.

• OSTI ID: 22273373
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DIELECTRIC MATERIALS
ELECTRON BEAMS
GRAPHENE
LASERS
PHASE DIAGRAMS
POLARONS
RADIATION SOURCES
RESONANCE
SURFACES
TEMPERATURE RANGE 0273-0400 K