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Ultra-narrow Line Width Polarization-Insensitive Filter Using a Symmetry-Breaking Selective Plasmonic Metasurface
ACS Photonics ( IF 6.5 ) Pub Date : 2017-12-22 00:00:00 , DOI: 10.1021/acsphotonics.7b01011 Yash D. Shah 1 , James Grant 1 , Danni Hao 1 , Mitchell Kenney 1 , Vincenzo Pusino 1 , David R. S. Cumming 1
ACS Photonics ( IF 6.5 ) Pub Date : 2017-12-22 00:00:00 , DOI: 10.1021/acsphotonics.7b01011 Yash D. Shah 1 , James Grant 1 , Danni Hao 1 , Mitchell Kenney 1 , Vincenzo Pusino 1 , David R. S. Cumming 1
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Plasmonic metasurfaces provide unprecedented control of the properties of light. By designing symmetry-breaking nanoholes in a metal sheet and engineering the optical properties of the metal using geometry, highly selective transmission and polarization control of light is obtained. To date such plasmonic filters have exhibited broad (>200 nm) transmission line widths in the NIR and as such are unsuitable for applications requiring narrow passbands, e.g., multispectral imaging. Here we present a novel subwavelength elliptical and circular nanohole array in a metallic film that simultaneously exhibits high transmission efficiency, polarization insensitivity, and narrow line width. The experimentally obtained line width is 79 nm with a transmission efficiency of 44%. By examining the electric and magnetic field distributions for various incident polarizations at the transmission peak we show that the narrowband characteristics are due to a Fano resonance. Good agreement is obtained between the experimental data, simulations, and analytical calculations. Our design can be modified to operate in other regions of the electromagnetic spectrum, and these filters may be integrated with suitable detectors such as photodiodes and single-photon avalanche diode arrays.
中文翻译：
超窄线宽偏振不敏感滤波器使用对称性突破的选择性等离子超表面。
等离子超表面为光的性质提供了前所未有的控制。通过在金属薄板上设计破坏对称性的纳米孔并使用几何形状设计金属的光学特性，可以获得高度选择性的透射和光的偏振控制。迄今为止，此类等离子滤波器在NIR中显示出较宽的（> 200 nm）传输线宽度，因此不适用于要求窄通带的应用，例如多光谱成像。在这里，我们提出了一种新型的金属膜中的亚波长椭圆形和圆形纳米孔阵列，该阵列同时展现出高传输效率，偏振不敏感性和窄线宽。实验获得的线宽为79 nm，传输效率为44％。通过检查透射峰处各种入射极化的电场和磁场分布，我们表明窄带特性归因于Fano共振。实验数据，模拟和分析计算之间获得了很好的一致性。我们的设计可以修改为在电磁频谱的其他区域工作，并且这些滤波器可以与合适的检测器集成在一起，例如光电二极管和单光子雪崩二极管阵列。
更新日期：2017-12-22
中文翻译：
超窄线宽偏振不敏感滤波器使用对称性突破的选择性等离子超表面。
等离子超表面为光的性质提供了前所未有的控制。通过在金属薄板上设计破坏对称性的纳米孔并使用几何形状设计金属的光学特性，可以获得高度选择性的透射和光的偏振控制。迄今为止，此类等离子滤波器在NIR中显示出较宽的（> 200 nm）传输线宽度，因此不适用于要求窄通带的应用，例如多光谱成像。在这里，我们提出了一种新型的金属膜中的亚波长椭圆形和圆形纳米孔阵列，该阵列同时展现出高传输效率，偏振不敏感性和窄线宽。实验获得的线宽为79 nm，传输效率为44％。通过检查透射峰处各种入射极化的电场和磁场分布，我们表明窄带特性归因于Fano共振。实验数据，模拟和分析计算之间获得了很好的一致性。我们的设计可以修改为在电磁频谱的其他区域工作，并且这些滤波器可以与合适的检测器集成在一起，例如光电二极管和单光子雪崩二极管阵列。
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