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首页> 外文期刊>Physical review >Excitation of terahertz surface plasmons on graphene surfaces by an elementary dipole and quantum emitter: Strong electrodynamic effect of dielectric support
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Excitation of terahertz surface plasmons on graphene surfaces by an elementary dipole and quantum emitter: Strong electrodynamic effect of dielectric support

机译：元素偶极子和量子发射体激发石墨烯表面太赫兹表面等离子体激元：介电载体的强大电动力效应

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摘要

The excitation of transverse magnetic (TM) surface plasmons by a point dipole in the vicinity of a multilayered graphene/dielectric system is examined. It was previously shown that the surface plasmon (SP) excited by a vertical dipole on an isolated graphene sheet exhibits a strong excitation peak in the THz region; here we show that, in the presence of a finite-thickness dielectric support layer such as SiO_2, considerable spectral content is transferred to a second (perturbed dielectric slab) mode, greatly decreasing and redshifting the excitation peak. The presence of a Si half-space also diminishes the excitation strength, but for graphene on top of SiO_2-Si the presence of the SiO_2 layer creates a spacer restoring the excitation peak. A two-level quantum emitter is also considered, where it is shown that the addition of a thin dielectric support slab and SiO_2-Si geometries affects the spontaneous decay rate in a manner similar to the classical dipole SP excitation peak.
机译：研究了多层石墨烯/介电体系附近的点偶极子对横向磁（TM）表面等离子体激元的激发。先前已证明，垂直等离子体在孤立的石墨烯片上激发的表面等离激元（SP）在THz区域显示出很强的激发峰。在这里，我们表明，在存在有限厚度的介电支撑层（例如SiO_2）的情况下，相当大的光谱含量转移到了第二个（扰动的介电平板）模式，极大地降低了激发峰并使之红移。 Si半空间的存在也会降低激发强度，但是对于SiO_2-Si顶部的石墨烯，SiO_2层的存在会产生一个间隔物，以恢复激发峰。还考虑了两级量子发射器，其中表明，薄的介电支撑平板和SiO_2-Si几何形状的添加以类似于经典偶极子SP激发峰的方式影响自发衰减率。

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  • 来源
    《Physical review》 |2012年第23期|235440.1-235440.9|共9页
  • 作者

    George W. Hanson; Ebrahim Forati; Whitney Linz; Alexander B. Yakovlev;

  • 作者单位

    Department of Electrical Engineering, University of Wisconsin-Milwaukee, 3200 N. Cramer St., Milwaukee, Wisconsin 53211, USA;

    Department of Electrical Engineering, University of Wisconsin-Milwaukee, 3200 N. Cramer St., Milwaukee, Wisconsin 53211, USA;

    Department of Electrical Engineering, University of Wisconsin-Milwaukee, 3200 N. Cramer St., Milwaukee, Wisconsin 53211, USA;

    Center for Applied Electromagnetic Systems Research (CAESR), Department of Electrical Engineering, The University of Mississippi, University, MS 38677, USA;

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    theory, models, and numerical simulation; electromagnetic wave propagation; radiowave propagation;

    机译：理论;模型和数值模拟;电磁波传播无线电波传播;

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