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首页> 外文期刊>Optical engineering >Wide-angle broadband near-perfect all-dielectric metamaterial reflector
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Wide-angle broadband near-perfect all-dielectric metamaterial reflector

机译：广角宽带近乎完美的全介电超材料反射器

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摘要

Compact nonabsorbing reflectors are useful in numerous important applications, such as surface protection against high-power irradiation, low-loss mirrors in laser cavities, and improvement of signal-to-noise ratios in bioimaging and nanosensing. We exploit the Mie resonance in periodically arranged silicon nano-spheres to design a wide-angle broadband near-perfect all-dielectric metamaterial reflector. First, we obtain the reflectance of a semi-infinite dilute medium of dielectric spheres arranged in a simple-cubic lattice in air and deduce criteria such as the radius and period required to obtain a near-perfect mirror. Next, we construct a near-perfect broadband mirror using the metasurfaces in the near-infrared wavelength range for the period-to-radius ratio of ～2.54 for normal incidence. Finally, we study the reflection characteristics of the multilayer nanosphere metamaterials. A near-perfect mirror is designed, which is independent of polarization, and the permitted incident-angle width reaches 40 deg for three layers of metamaterial. This is the first study to address the optimal structure parameters for metasurfaces and the reflection characteristics of multilayer metamaterials. Our findings provide guidelines for the design of photonic devices based on dielectric metamaterials.
机译：紧凑型非吸收性反射器可用于许多重要应用中，例如针对高功率辐射的表面保护，激光腔中的低损耗反射镜以及生物成像和纳米传感中信噪比的改善。我们利用周期性排列的硅纳米球中的Mie共振来设计广角宽带近乎完美的全介电超材料反射器。首先，我们获得了在空气中以简单立方晶格排列的半球形电介质球的半无限稀薄介质的反射率，并推导了获得近似完美镜面所需的半径和周期等标准。接下来，我们使用近红外波长范围内的超表面为法向入射的周期半径比〜2.54构造近乎完美的宽带反射镜。最后，我们研究了多层纳米球超材料的反射特性。设计了一个近乎完美的反射镜，它与偏振无关，对于三层超材料，允许的入射角宽度达到40度。这是针对超表面的最佳结构参数和多层超材料的反射特性的第一项研究。我们的发现为基于介电超材料的光子器件设计提供了指导。

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