Xiao Xiao, Leung Ho Ming, Chan C T, Wen Weijia
Department of Physics, Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong, China.
Sci Rep. 2015 Feb 6;5:8306. doi: 10.1038/srep08306.
By generalizing the concept of spoof surface Plasmons (Science 305, 847), we analytically demonstrate that subwavelength quarter-wave and half-wave plates can be realized in a metal hole array (MHA) sandwiched by two thin-layer materials, whose optical responses can be characterized by their optical conductivities. These abilities of polarization conversion can be attributed to the novel eigenstates induced by the hybridization of the spoof surface plamsons with the current generated in the thin-layer. Due to this mechanism, the robustness of the system is promised. The analytic predictions are verified numerically by modeling the thin-layer material as an experimentally feasible topological-insulator/SiO2 multilayer. Moreover, the possibility of extending the principle to a broad range of materials is dicussed.
通过推广表面等离激元赝模的概念（《科学》305卷，847页），我们通过分析证明，亚波长四分之一波片和半波片可以在夹于两种薄层材料之间的金属孔阵列（MHA）中实现，其光学响应可以通过它们的光学电导率来表征。这些偏振转换能力可归因于表面等离激元赝模与薄层中产生的电流杂化所诱导的新型本征态。由于这种机制，该系统具有稳健性。通过将薄层材料建模为实验上可行的拓扑绝缘体/SiO₂多层结构，对解析预测进行了数值验证。此外，还讨论了将该原理扩展到广泛材料的可能性。
