230-fold Enhancement of second-harmonic generation by coupled double resonances in a dolmen-type gold metasurface

Xiaoteng Sun, Lili Gui, Hailun Xie, Yiwen Liu, Kun Xu
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Abstract

Optical metasurfaces, artificial planar nanostructures composed of subwavelength meta-atoms, have attracted significant attention due to their ability to tailor optical nanoscale properties, making them a versatile platform for shaping light in both linear and nonlinear regimes. This paper reports on the realization of second harmonic generation (SHG) enhancement based on a dolmen-type gold metasurface containing two resonances. Nonlinear scattering theory is employed to numerically investigate the SHG enhancement phenomenon in the resonant metasurface. The periodic dolmen-type gold metasurface introduces a diffraction coupling effect between Fano resonance and surface lattice resonance (SLR), providing strong local-field enhancement and significantly enhancing the nonlinear effect. We analyze the influence of the coupling between Fano resonance and SLR on the SHG intensity and achieve a 230-fold enhancement in SHG intensity compared to the single resonance case by adjusting the periodicity of the metasurface. The SHG-enhanced gold metasurface may find applications in sensing, imaging, optical computing, and integrated nonlinear optics.
多尔曼型金元表面耦合双共振的二次谐波生成增强了 230 倍
光学元表面是由亚波长元原子组成的人造平面纳米结构,因其能够定制光学纳米级特性而备受关注,成为在线性和非线性状态下塑造光线的多功能平台。本文报告了基于包含两个共振的多尔曼型金元面实现二次谐波发生(SHG)增强的情况。本文采用非线性散射理论对共振元表面的 SHG 增强现象进行了数值研究。周期性多门型金元面在法诺共振和表面晶格共振(SLR)之间引入了衍射耦合效应,提供了强大的局部场增强,并显著增强了非线性效应。我们分析了法诺共振和表面晶格共振之间的耦合对 SHG 强度的影响,并通过调整元表面的周期性实现了 SHG 强度比单共振情况下增强 230 倍。SHG 增强金元表面可应用于传感、成像、光学计算和集成非线性光学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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