光学近场作用下双层纳米结构的单向光传输
Unidirectional light transmission by two-layer nanostructures interacting via optical near-fields
摘要：
我们实验证明单向光传输通过两层纳米结构材料考虑的水平到垂直偏振转换效率在前向方向和垂直到水平的效率在后向方向，这通常是等效的，由于光学互易性，是不同的。通过层之间的光学近场在向前和向后方向上传递光动量的不同方式是光的单向性的原因，这在我们最近的工作[J. Opt. Soc. Am. B 31，2404 - 2413]。通过重复剥离技术实验制造的两层金属纳米结构，观察到一致的光学特性，验证了利用光学近场的大动量。
英文摘要：
We experimentally demonstrate unidirectional light transmission through two-layer nanostructured materials considering that the horizontal-to-vertical-polarization conversion efficiency in the forward direction and the vertical-to-horizontal efficiency in the backward direction, which are usually equivalent due to optical reciprocity, are different. The different ways of transferring light momentum in the forward and backward directions via optical near-fields between the layers are responsible for the unidirectionality of light, which was theoretically investigated in our recent work [J. Opt. Soc. Am. B 31, 2404-2413]. With two-layer metal nanostructures experimentally fabricated via a repeated lift-off technique, consistent optical characteristics are observed, verifying the utilization of the large momentum of optical near-fields.
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