Fano enhancement of second harmonic field via dark-bright plasmon coupling

IF 1.4 Q3 PHYSICS, MULTIDISCIPLINARY Turkish Journal of Physics Pub Date : 2021-08-31 DOI:10.3906/fiz-2103-5
Mehmet Günay
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Abstract

Surface plasmon resonances, the coherent oscillation of free electrons, can concentrate incident field into small volumes much smaller than the incident wavelength. The intense fields at these \textit{hot spots} enhance the light-matter interactions and may lead to the appearance of nonlinearity. Controlling such nonlinearities is significant for various practical applications. Here we report that by coupling dark modes to the first and the generated second harmonic modes separately, one can gain control over both fields. We find that by engineering path interferences (Fano resonances) between bright and dark plasmon modes it is possible to enhance the fundamental mode without increasing the nonlinear field, enhance the nonlinear field without modifying the fundamental mode, and enhance the second harmonic field with enhanced fundamental mode.
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暗亮等离子体耦合对二次谐波场的Fano增强
表面等离子体共振,即自由电子的相干振荡,可以将入射场集中到比入射波长小得多的小体积中。这些热点处的强场增强了光与物质的相互作用,并可能导致非线性的出现。控制这种非线性对于各种实际应用是重要的。在这里,我们报告了通过将暗模式分别耦合到一次谐波模式和生成的二次谐波模式,可以获得对两个场的控制。我们发现,通过在亮和暗等离子体激元模式之间进行路径干涉(Fano共振),可以在不增加非线性场的情况下增强基本模式,在不修改基本模式的情况下提高非线性场,并通过增强的基本模式提高二次谐波场。
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来源期刊
Turkish Journal of Physics
Turkish Journal of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
0.00%
发文量
8
期刊介绍: The Turkish Journal of Physics is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK) and accepts English-language manuscripts in various fields of research in physics, astrophysics, and interdisciplinary topics related to physics. Contribution is open to researchers of all nationalities.
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