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Optical cavity-assisted broadband optical transparency of a plasmonic metal film

机译：等离子体金属膜的光腔辅助宽带光学透明性

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摘要

We theoretically present a powerful method to achieve a continuous metal film structure with broadband optical transparency via introducing a dielectric Fabry-Perot (FP) cavity. An incident optical field could be efficiently coupled and confined with the strong localized plasmons by the non-close-packed plasmonic crystal at the input part and could then become re-radiated output via the transmission channel supported by the dielectric cavity. The formed photonic-plasmonic system could therefore make the seamless metal film structure have a superior near-unity transparency (up to 97%) response and a broadband transparent spectrum with bandwidth >245 nm (with transmittance >90%) in the optical regime. The observed optical properties of the proposed structure can be highly tuned via varying the structural parameters. Based on the colloidal assembly method, the proposed plasmonic crystal can be fabricated in a large area. In addition, the achieved optical transparency can be retained in the extremely roughed metal film structure. Thereby, the findings could offer a feasible way to achieve a broadband transparent metal film structure and hold potential applications in transparent electrodes, touch screens and interactive electronics.
机译：我们在理论上提出了一种强大的方法，可以通过引入电介质Fabry-Perot（FP）腔来实现具有宽带光学透明性的连续金属膜结构。入射光场可以在输入部分被非紧密堆积的等离激元晶体有效地耦合并限制在强局域等离激元中，然后可以通过介电腔所支撑的传输通道成为再辐射输出。因此，所形成的光子-等离子体系统可以使无缝金属膜结构具有优异的近统一透明性（高达97％）响应以及在光学方案中带宽大于245 nm（透射率大于90％）的宽带透明光谱。可以通过改变结构参数来高度调整所提出结构的观察到的光学特性。基于胶体组装方法，可以大面积制造提出的等离子体晶体。另外，可以在极其粗糙的金属膜结构中保持所获得的光学透明性。因此，这些发现可能为实现宽带透明金属膜结构并在透明电极，触摸屏和交互式电子产品中保持潜在的应用提供可行的方法。

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