在双层元表面中,破坏性干扰介导的拓转换在双层元表面中
Bo Wang1, Ruhao Pan1, Lechen Yang1
1Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, 100190 Beijing, China.
Physical review letters
|February 16, 2026
概括
研究人员在双层超表面内的连续 (BICs) 中的光学束状态中动态控制拓电荷. 调节间隔器厚度诱导了拓过渡,增强了质量因素并改变了缩放规律而不会破坏对称性.
科学领域:
- 光子学和光学元材料. 光学元材料.
- 凝聚物质物理学. 凝聚物质物理学.
- 这是纳米光子学.
背景情况:
- 连续体中的光学束状态 (BICs) 是异国情调的状态,远场辐射消失.
- 在动量空间中,BIC表现出极化奇点与整数拓电荷.
- 对称性保护对于保持BIC属性至关重要.
研究的目的:
- 调查对称性保护BIC中拓电荷的动态演变.
- 为了探索双层元表面的拓过渡.
- 了解对称性和干扰在BIC行为中的作用.
主要方法:
- 使用扰动理论进行理论建模.
- 双层元表面的实验制造和表征.
- 对拓电荷和远场辐射特性进行分析.
主要成果:
- 通过调整间距厚度,在BIC中证明了从v=1到v=-2的拓过渡.
- 确定了破坏性双层干扰作为拓过渡的机制.
- 观察到增强的质量因子和改变的缩放规律 (O(k^{-4})) 对于近-Γ共振.
结论:
- 引入了一种对称性保留机制,用于动态控制BIC拓.
- 调整元地表参数可以在不破坏基本对称性的情况下诱导拓过渡.
- 这些发现为设计先进的光子设备提供了新的途径.
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