光学奇异点附近的交叉偏振特性研究(特邀)
Cross-Polarization Effects Near the Exceptional Points(Invited)
杨锦 1袁帅杰 1刘旭荃 1周新星1
作者信息
- 1. 湖南师范大学物理与电子科学学院,量子效应及其应用协同创新中心,低维量子结构与调控教育部重点实验室,湖南 长沙 410081
- 折叠
摘要
构建了非厄米系统中的高斯光束传输模型,探究了宇称-时间对称(PT-symmetric)结构中奇异点附近的交叉偏振特性.研究表明,当系统状态位于奇异点附近时,交叉偏振分量呈现出类似于一阶厄米-高斯模式的双峰强度分布,而此时原偏振分量呈现出与单一圆偏振分量相似且垂直于交叉偏振分量的双峰分布.进一步调整入射光的偏振态,还可以观察到交叉偏振分量的显著旋转现象.此外,该系统在跨越奇异点的过程中,交叉偏振分量的旋转方向也会随之翻转,这为精密探测奇异点的位置提供了一条新颖的思路.最后,奇异点附近所存在的强交叉偏振效应也为增强光子自旋霍尔效应提供了理论依据.
Abstract
We construct a propagation model of Gaussian beam in non-Hermitian system and explore the cross-polarization effects near the exceptional points in parity-time symmetric(PT-symmetric)structure.The results show that when the light beam is incident near the exceptional points,the cross-polarization component shows a double-peak intensity distribution similar to the first-order Hermite-Gaussian model.Conversely,the original polarization component shows a double-peak intensity distribution similar to the single circularly polarized components,which are perpendicular to the cross-polarization component.By adjusting the incident polarization angle,a significant rotation of the cross-polarization component near the exceptional point is revealed.Moreover,the direction of rotation of the cross-polarization component is reversed when the system crosses the exceptional points,providing a novel idea to precisely explore the position of the exceptional points.Finally,the strong cross-polarization effects near the exceptional points provide a theoretical guide for enhancing the photonic spin Hall effect.
关键词
交叉偏振/奇异点/宇称-时间对称/偏振Key words
cross-polarization/exceptional point/parity-time symmetry/polarization引用本文复制引用
基金项目
国家自然科学基金(11604095)
长沙市杰出青年培养计划(kq2107013)
出版年
2024
NETL
NSTL
万方数据