平面工程多通道反射器
Flat Engineered Multi-Channel Reflectors
摘要：
工程化梯度超颖表面的最新进展已经实现了使用光学薄片进行光操纵的前所未有的机会，例如入射光束的异常折射、反射或聚焦。在这里，我们引入了多通道功能元表面的概念，它能够同时控制多个传播方向上的传入和传出波。特别是，我们揭示了一种可能性工程多通道反射器。在互易性和能量守恒的假设下，我们发现这种反射器存在三种基本功能：镜面反射、反常反射和逆反射。一般平面反射器的多通道响应可以通过这些功能的组合来描述。为了证明所介绍的概念的潜力，我们设计和实验测试三种不同的多通道反射器：三通道和五通道回射器和三通道功率分配器。此外，通过扩展的概念，反射器支持高阶Floquet谐波，我们预测出现的其他多通道平面设备，如隔离镜，复杂的分裂器，和多功能光栅。
英文摘要：
Recent advances in engineered gradient metasurfaces have enabled unprecedented opportunities for light manipulation using optically thin sheets, such as anomalous refraction, reflection, or focusing of an incident beam. Here we introduce a concept of multi-channel functional metasurfaces, which are able to control incoming and outgoing waves in a number of propagation directions simultaneously. In particular, we reveal a possibility to engineer multi-channel reflectors. Under the assumption of reciprocity and energy conservation, we find that there exist three basic functionalities of such reflectors: Specular, anomalous, and retro reflections. Multi-channel response of a general flat reflector can be described by a combination of these functionalities. To demonstrate the potential of the introduced concept, we design and experimentally test three different multi-channel reflectors: Three- and five-channel retro-reflectors and a three-channel power splitter. Furthermore, by extending the concept to reflectors supporting higher-order Floquet harmonics, we forecast the emergence of other multiple-channel flat devices, such as isolating mirrors, complex splitters, and multi-functional gratings.
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