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| 基于几何相位的线偏振聚焦超表面器件 |
| Focal modulation on geometric-phase dielectric metasurfaces under linear polarization |
| 投稿时间:2019-04-04 |
| DOI:10.3969/j.issn.1005-5630.2020.01.003 |
| 中文关键词: 太赫兹波 超表面 几何相位 线偏振光聚焦 |
| 英文关键词:terahertz metasurface geometric phase the focusing of the metasurface illuminated by linearly polarized light |
| 基金项目:国家自然科学基金(61871268);国家重点研发计划(2017YFA0701005) |
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| 中文摘要: |
| 设计出基于几何相位的介质超表面实现线偏振光聚焦功能。该设计打破了传统设计中几何相位(Pancharatnam–Berry phase)的手性限制,不再是局限于左旋圆偏振光(LCP)和右旋圆偏振光(RCP)入射。通过有限时域差分仿真来证明这种线偏振聚焦相位调控的特性。该类功能器件可能用于设计新颖的THz元器件、高分辨成像、功能探测等方面。 |
| 英文摘要: |
| We proposed a dielectric metasurface that can focus linearly polarized lights based on geometric phase. The proposed approach is insensitive to both LCP and RCP incident beams, that is, breaking the traditional helicity-dependent geometric metasurface. The corresponding characteristics are demonstrated based on the finite-difference time-domain calculation. Such a device may have potential applications in high-resolution imaging, novel terahertz devices, functional detection and so on. |
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