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首页> 外文期刊>Optics Letters >Non-metallic and angular-insensitive metasurface transmissive long-pass filter in the visible and near-infrared regions
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Non-metallic and angular-insensitive metasurface transmissive long-pass filter in the visible and near-infrared regions

机译：在可见和近红外区域中的非金属和角度不敏感的元表面透射长通滤波器

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In this Letter, we report on a non-metallic and angular-insensitive transmissive optical long-pass filter in the visible and near-infrared regions, which uses two sets of dielectric nanopillars grown on SiO2 substrate with MgF2 on the top. Coupled Mie resonances are generated from the two sets of dielectric nanopillars with different sizes so that high reflection and absorption are realized to steeply cut off the transmission in shorter wavelengths and to ensure a high transmission in longer wavelengths. A polarizationindependent and wide-angular-insensitive (up to 60 degrees) cutoff effect is realized within a surface layer that is only 399 nm thick. Double-beam ultraviolet interference lithography and sputter coating depositions are designed to efficiently fabricate the proposed metasurface with a multi-set of sub-nanostructures. Experimental results demonstrate that high isolation with an extinction ratio > 16.53 dB (19.54 dB in simulation) and steep cutoffwith a cutoff slope > 0.013 nm(-1) (0.022 nm(-1) in simulation) in transmission can be achieved. The demonstrated device suggests an efficient way of designing and fabricating angular-insensitive optical filters with metasurfaces, which is of importance in applications such as the liquid crystal display, optical communication, and sensors. (C) 2020 Optical Society of America
机译：在这封信中，我们在可见和近红外区域报告了在可见和近红外区域中的非金属和角度不敏感的透射光学长通滤光器，其在顶部的MGF2上使用两组介电纳米粒子在SiO 2基板上生长。耦合的MIE谐振由具有不同尺寸的两组电介质纳米粒子产生，使得实现高反射和吸收以急剧地切断较短波长的变速器，并确保在更长波长中的高传输。在仅399nm厚的表面层内实现了极化依赖性和宽角度不敏感（最多60度）截止效果。双束紫外线干扰光刻和溅射涂层沉积设计用于用多组亚纳米结构有效地制造所提出的质量表面。实验结果表明，具有消光比的高分离率> 16.53dB（模拟中的19.54dB）和陡峭的切断率可以实现在变速器中的截止斜率> 0.013nm（-1）（0.022nm（-1））。所示的装置表明了一种有效的设计和制造具有元件的无敏感光学过滤器的有效方式，这在诸如液晶显示器，光学通信和传感器的应用中具有重要性。 （c）2020美国光学学会

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