Polarization control with nanostructures having a tunable design and allowing inexpensive large-scale fabrication is important for many nanophotonic applications. For this purpose, we developed and experimentally demonstrated nanostructured plasmonic surfaces based on hexagonal arrays of anisotropic coaxial nanocavities, which can be fabricated by a low-cost self-assembled nanosphere lithography method. Their high polarization sensitivity is achieved by engineering anisotropy of the coaxial nanocavities, while the optical response is enhanced by the excitation of surface plasmon resonances. Particularly, varying the geometrical parameters of the coaxial nanocavities, namely the height and tilt angle of their central core nanoellipsoids, the plasmonic resonance wavelengths as well as the polarization-selective behavior can be individually tuned in the entire visible and near-infrared spectral regions, which makes such nanostructures good candidates for the implementation of polarization-controlled optical switches and polarization-tunable filters. Moreover, the developed nanostructures demonstrate sensitivity up to 1335 nm/RIU in refractive index sensing.

中文翻译：

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利用各向异性等离子体同轴纳米腔自组装阵列进行可调谐偏振控制

具有可调谐设计并允许廉价的大规模制造的纳米结构的偏振控制对于许多纳米光子应用来说非常重要。为此，我们开发并实验证明了基于各向异性同轴纳米腔六边形阵列的纳米结构等离子体表面，该表面可以通过低成本自组装纳米球光刻方法制造。它们的高偏振灵敏度是通过设计同轴纳米腔的各向异性来实现的，而光学响应则通过表面等离子体共振的激发而增强。特别是，改变同轴纳米腔的几何参数，即其中心核心纳米椭球的高度和倾斜角，等离子体共振波长以及偏振选择行为可以在整个可见光和近红外光谱区域中单独调节，这使得这种纳米结构成为实现偏振控制光开关和偏振可调滤波器的良好候选者。此外，所开发的纳米结构在折射率传感中表现出高达 1335 nm/RIU 的灵敏度。