Terahertz plasmon-polariton modes in graphene driven by electric field inside a Fabry-Pérot cavity
Terahertz plasmon-polariton modes in graphene driven by electric field inside a Fabry-Pérot cavity
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DOI：
10.1063/1.4922401
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发表时间：
2015-06
影响因子：
3.2
通讯作者：
C. Zhao;W-ping Xu;L. L. Li-L.;C. Zhang;F. Peeters
中科院分区：
文献类型：
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作者：
C. Zhao;W-ping Xu;L. L. Li-L.;C. Zhang;F. Peeters
我们提出了一项关于石墨烯中等离子体-极化子模式的理论研究，该模式被放置在光学腔中并由源-漏电场驱动。电子速度和电子温度是通过求解自一致的动量和能量平衡方程来确定的，其中电子与杂质、声学和光学声子的相互作用包括在内。基于多体自洽场理论，提出了一种研究电子气体系统中等离子体-极化子的简便方法。我们发现，当石墨烯被放置在法布里-珀罗腔中时，可以观察到等离子体-极化子模式的两个分支，这些模式非常类似于光学或等离子体。这些模式的频率明显依赖于驱动电场，特别是在高谐振频率区域。此外，石墨烯中的等离子体极化子频率为太赫兹（THz）带宽，可以通过改变腔长、栅极电压和驱动电场来调谐。这项工作与石墨烯基结构作为可调谐太赫兹等离子体器件的应用有关。
We present a theoretical study on plasmon-polariton modes in graphene placed inside an optical cavity and driven by a source-to-drain electric field. The electron velocity and electron temperature are determined by solving self-consistently the momentum- and energy-balance equations in which electron interactions with impurities, acoustic-, and optic-phonons are included. Based on many-body self-consistent field theory, we develop a tractable approach to study plasmon-polariton in an electron gas system. We find that when graphene is placed inside a Fabry-Perot cavity, two branches of the plasmon-polariton modes can be observed and these modes are very much optic- or plasmon-like. The frequencies of these modes depend markedly on driving electric field especially at higher resonant frequency regime. Moreover, the plasmon-polariton frequency in graphene is in terahertz (THz) bandwidth and can be tuned by changing the cavity length, gate voltage, and driving electric field. This work is pertinent to the application of graphene-based structures as tunable THz plasmonic devices.