11 May 2017 Design of broadband anti-reflective metasurfaces based on an effective medium approach
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In this paper we show how to systematically design anti-reflective metasurfaces for the mid-infrared wavelength range. To do so, we have utilized a multilayer arrangement involving a judiciously nano-perforated surface, having air holes, arranged in a hexagonal fashion. By exploiting an effective medium approach, we optimized the dimensions of the surface features in our design. Here, we report a broadband reflectivity 3.5 − 5.5 μm that is below 10% over a broad range of incident angles 00 ≤ θ𝑖 ≤ 700 , irrespective of the incident polarization (TE, TM). Our experimental results are in excellent agreement with full-wave finite element simulations. This systematic approach can be used to design a wide variety of patterned metasurfaces, capable of controlling the phase of the incident optical field.
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N. S. Nye, N. S. Nye, A. Swisher, A. Swisher, C. Bungay, C. Bungay, S. Tuenge, S. Tuenge, T. Mayer, T. Mayer, D. N. Christodoulides, D. N. Christodoulides, C. Rivero-Baleine, C. Rivero-Baleine, } "Design of broadband anti-reflective metasurfaces based on an effective medium approach", Proc. SPIE 10181, Advanced Optics for Defense Applications: UV through LWIR II, 101810J (11 May 2017); doi: 10.1117/12.2262026; https://doi.org/10.1117/12.2262026

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