Wu Feng, Chen Mingyuan, Xiao Shuyuan
Opt Lett. 2022 May 1;47(9):2153-2156. doi: 10.1364/OL.455910.
Conventional defect modes in all-dielectric 1D photonic crystals (PCs) are polarization-insensitive. This poses a great challenge in achieving high-performance polarization selectivity. In this Letter, we introduce a defect layer into a 1D PC containing hyperbolic metamaterials to achieve an anomalous defect mode with polarization-sensitive characteristics. As the incident angle increases, such a defect mode remains almost unshifted under transverse magnetic polarization, while strongly shifting toward shorter wavelengths under transverse electric polarization. The polarization-sensitive characteristics of the defect mode can be well explained by the Fabry-Perot resonance condition. Assisted by the polarization-sensitive defect mode, wide-angle polarization selectivity with an operating angle width up to 54.8° can be realized. Our work provides a route to designing wide-angle linear polarizers using simple 1D structures, which would be useful in liquid crystal display and Q-switched lasers.
全介质一维光子晶体（PCs）中的传统缺陷模式对偏振不敏感。这在实现高性能偏振选择性方面带来了巨大挑战。在本信函中，我们将一个缺陷层引入到包含双曲线超材料的一维光子晶体中，以实现具有偏振敏感特性的异常缺陷模式。随着入射角增加，这种缺陷模式在横向磁偏振下几乎不发生偏移，而在横向电偏振下则强烈地向更短波长方向移动。缺陷模式的偏振敏感特性可以通过法布里 - 珀罗共振条件得到很好的解释。借助这种偏振敏感缺陷模式，可以实现工作角宽度高达54.8°的广角偏振选择性。我们的工作为使用简单的一维结构设计广角线性偏振器提供了一条途径，这在液晶显示器和调Q激光器中将会很有用。
