Flat optical transparent window: mechanism and realization based on metasurfaces
Flat optical transparent window: mechanism and realization based on metasurfaces
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平面光学透明窗：基于超表面的机理与实现
DOI：
10.1088/1361-6463/aaa451
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发表时间：
2018-02-21
影响因子：
3.4
通讯作者：
Zhou, Lei
中科院分区：
文献类型：
--
作者：
Guo, Huijie;Lin, Jing;Zhou, Lei
在各种应用中高度期望展现具有可忽略的透射率波动的宽带光学透明窗口（OTW）的材料，但是堆叠多个透射谐振超颖表面的常规方法在OTW内产生不期望的幅度波动。在这篇文章中，我们首先建立了一个耦合模理论，以了解在这样的系统中的传输特性的固有物理，基于此，我们然后提出了一个标准，可以帮助研究人员设计具有减少透射率波动的宽带OTW结构。与蛮力优化方法相比，我们的方法更快，物理直观。作为我们理论的一个例证，我们设计了一个四层结构（总厚度为36 mm），通过解决所提出的标准，并实验证明，它表现出平坦的OTW在3.7-5 GHz的范围内，与透射率波动小于10%。我们的研究结果可以刺激人工结构的设计，表现出所需的形状的传输窗口拟合应用程序在不同的频率制度。
A material exhibiting a wide-band optical transparent window (OTW) with negligible transmittance fluctuation is highly desired in various applications, but the conventional approach of stacking multiple transmission-resonant metasurfaces creates undesired amplitude fluctuations within the OTW. In this article, we first establish a coupled-mode theory to understand the inherent physics governing the transmission properties in such systems, based on which we then propose a criterion that can help researchers design structures exhibiting wide-band OTWs with diminished transmittance fluctuations. Compared to a brute-force optimization method, our approach is much faster and physically intuitive. As an illustration of our theory, we design a four-layer structure (with a total thickness of 36 mm) through solving the proposed criterion, and experimentally demonstrate that it exhibits a flat OTW within the 3.7–5 GHz range, with transmittance fluctuations smaller than 10 percent. Our findings can stimulate the design of artificial structures exhibiting the desired shapes of transmission windows fitting applications in different frequency regimes.