1 复旦大学物理学系，应用表面物理国家重点实验室，上海市超构表面光场调控重点实验室，上海 200433
2 复旦大学光科学与工程系上海超精密光学制造工程技术研究中心，上海 200433
从超构表面调控电磁波研究的发展历史出发，详细介绍了基于复合相位超构表面实现高效多功能调控圆偏振电磁波的原理、设计思路和实验模拟表征，对近期国内外在这一领域的研究进展进行简要的论述，着力以此引导相关研究性实验教学，并为相关领域研究人员提供指引。
超构表面 共振相位 传输相位 几何相位 复合相位 圆偏振光 多功能 光学学报
2024, 44(10): 1026008
Author Affiliations
Abstract
Anhui Key Laboratory of Optoelectric Materials Science and Technology, School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, China
The temporal coupled-mode theory (TCMT) has made significant progress in recent years, and is widely applied in explaining a variety of optical phenomena. In this paper, the optical characteristics of the metasurface composed of nano-bars and nano-rings are simulated. The simulation results are well explained by TCMT under the coupled basis vector. However, when the structural asymmetry is large, the fitting of results shows that the total radiation loss is not conservative, in contradiction to the requirement of traditional TCMT. We solved this inconsistency by introducing the propagation phase into the near-field coupling term of TCMT. The studies show that, unlike the local mode near the exceptional point which corresponds to the radiation loss of the bright mode, the global mode near the diabolic point is closely related to the propagation phase. Furthermore, the structure near the diabolic point shows characteristic cross-coupling with the change of period. This study proposes a new theoretical framework for comprehending the interaction of light and matter and offers some guiding implications for the application of TCMT to a variety of related domains.
temporal coupled-mode theory exception point diabolic point propagation phase Chinese Optics Letters
2023, 21(1): 010003
1 长春理工大学光电工程学院, 吉林 长春130022
2 中国科学院苏州生物医学工程技术研究所江苏省医用光学重点实验室, 江苏 苏州 215163
设计出一种对左旋和右旋圆偏振光产生各向异性相位调制的双模超表面器件。该器件在改变硅纳米柱尺寸进而调控传输相位的同时,改变了其面内旋向获得附加的几何相位。由于两种相位的结合,入射到超表面器件的右旋圆偏振光实现了44.8%的聚焦效率,而对于入射左旋圆偏振光,则保持其平面波前透射。该超表面器件作为小型化偏振器件可应用于信息加密传输等领域。
光学器件 双模超表面 偏振响应 几何相位 传输相位
