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Analytical Determination of Plasmon Resonances in MIM Nanocavities

机译:MIM纳米腔中等离子体共振的分析测定

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摘要

Optical interactions in many metallic nanostructures involve plasmon resonances in the basic elements of metal-insulator-metal (MIM) nanocavities. Though the resonances can be theoretically studied with numerical simulations, an analytical approach is highly needed for its advantage in physical analysis and target-oriented design of structures. But it is often obstructed by the difficulty in calculation of reflection coefficients of the surface plasmon (SP) waves at terminals of the MIM nanocavities. Here, we use the permittivity of real metals, instead of perfect electric conductors, to have a discussion on the study of this issue by R. Gordon [PRB, 73, 153405, 2006], to clarify the applicability of this method to calculate SP reflection coefficients. Further, based on the Fabry-Perot cavity model, plasmon resonances in metallic nanoslit and nanogroove cavities are studied and compared with results obtained from rigorous numerical simulations.
机译:许多金属纳米结构中的光学相互作用涉及金属-绝缘体-金属(MIM)纳米腔的基本元素中的等离子体激元共振。尽管可以通过数值模拟从理论上研究共振,但是由于其在物理分析和面向目标的结构设计中的优势,因此迫切需要一种分析方法。但是,通常难以计算MIM纳米腔末端的表面等离激元(SP)波的反射系数。在这里,我们用真实金属的介电常数代替完美的电导体,来讨论R. Gordon [PRB,73,153405,2006]对这一问题的研究,以阐明该方法在计算SP时的适用性。反射系数。此外,基于Fabry-Perot腔模型,研究了金属纳米缝隙和纳米槽腔中的等离子体激元共振,并将其与严格的数值模拟结果进行了比较。

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