太赫兹电磁辐射与二维等离子体激元的有效耦合

2013 International Conference on Advanced Optoelectronics and Lasers (CAOL 2013) Pub Date : 2013-11-07 DOI:10.1109/CAOL.2013.6657596

V. Korotyeyev, Yu. M. Lyaschuk

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引用次数: 1

摘要

提出了由亚波长金属光栅和光栅下的二维电子气体层组成的等离子体结构“光栅- 2DEG”的理论。结果表明，在太赫兹频率范围内，透射系数、反射系数和损耗系数的频率依赖关系与二维等离子激元激发有关。详细研究了系统几何参数和电学参数对等离子体共振的影响。分析了近场区电磁场的结构。得到了电场分量、能量密度和电磁波极化的空间依赖关系。结果表明，在等离子体共振中，近场区电场局域幅值明显增大。

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Effective coupling between THz electromagnetic radiation and 2D plasmons

Theory of the plasmonic structure “grating - 2DEG” that consists of subwavelength metallic grating and a layer of the 2D-electron gas under the grating is presented. It is shown that frequency dependencies of the transmission, reflection and losses coefficients in THz frequency range have resonance behavior which relates to the 2D-plasmon excitation. The influence of geometrical and electrical parameters of the system on plasmonic resonance is studied in detail. The structure of the electromagnetic field in the near-field zone is analyzed. The spatial dependencies of the electric field components, density of the energy and the polarization of electromagnetic wave are found. It is shown the essential increasing of the local magnitude of the electric field in near-field zone at the plasmonic resonance.

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2013 International Conference on Advanced Optoelectronics and Lasers (CAOL 2013)

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