Resonant reflection by microsphere arrays with AR-quenched Mie scattering
Resonant reflection by microsphere arrays with AR-quenched Mie scattering
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DOI：
10.1364/oe.427982
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发表时间：
2021-06-07
期刊：
影响因子：
3.8
通讯作者：
Magnusson, Robert
中科院分区：
文献类型：
--
作者：
Razmjooei, Nasrin;Ko, Yeong Hwan;Magnusson, Robert
在相当大的光谱带宽上提供完美反射的周期性导模共振结构已经被人们知道了几十年，现在通常被称为超材料和超材料。虽然这些设备的基本物理是由漏布洛赫模式的倏逝波激发解释的，但越来越多的文献认为，局部粒子共振是完美反射的原因。在这里，我们解决分化米氏共振和导模共振介导的共振反射周期性粒子组装。我们对待一个经典的2D周期性阵列组成的硅球。为了禁用米氏共振，我们将最佳的AR涂层应用于球体。涂层和未涂层球体的反射率图表明，在这两种情况下都存在完美的反射。结果表明，AR涂层球体的Mie散射效率大大降低。AR涂层的球形阵列的反射特性以前没有出现在文献中。从这个角度来看，这些结果说明了高效率的共振反射在米氏共振猝灭粒子阵列，并可能有助于消除误解的基本操作物理。(C)根据OSA开放获取出版协议的条款，2021年美国光学学会
Periodic guided-mode resonance structures which provide perfect reflection across sizeable spectral bandwidths have been known for decades and are now often referred to as metasurfaces and metamaterials. Although the underlying physics for these devices is explained by evanescent-wave excitation of leaky Bloch modes, a growing body of literature contends that local particle resonance is causative in perfect reflection. Here, we address differentiation of Mie resonance and guided-mode resonance in mediating resonant reflection by periodic particle assemblies. We treat a classic 2D periodic array consisting of silicon spheres. To disable Mie resonance, we apply an optimal antireflection (AR) coating to the spheres. Reflectance maps for coated and uncoated spheres demonstrate that perfect reflection persists in both cases. It is shown that the Mie scattering efficiency of an AR-coated sphere is greatly diminished. The reflectance properties of AR-coated spherical arrays have not appeared in the literature previously. From this viewpoint, these results illustrate high-efficiency resonance reflection in Mie-resonance-quenched particle arrays and may help dispel misconceptions of the basic operational physics. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement