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

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posted on 2024-11-15, 14:21 authored by Shenggang Liu, Chao ZhangChao Zhang, Min Hu, Xiaoxing Chen, Ping Zhang, Sen Gong, Tao Zhao, Renbin Zhong
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.

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Citation

Liu, S., Zhang, C., Hu, M., Chen, X., Zhang, P., Gong, S., Zhao, T. & Zhong, R. (2014). Coherent and tunable terahertz radiation from graphene surface plasmon polaritons excited by an electron beam. Applied Physics Letters, 104 (20), 201104-1-201104-5.

Journal title

Applied Physics Letters

Volume

104

Issue

20

Language

English

RIS ID

90827

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