单层超表面使得线性极化器和四分之一波板用于芯片级原子钟
Taolong Wang1,2, Zhiqiang Li1, Ting Liang1
1Key Laboratory of Micro/Nano Devices and Systems, Ministry of Education, North University of China, Taiyuan 030051, China.
Micromachines
|January 28, 2026
概括
一个新的超表面作为线性偏振器和四分之一波板,增强芯片级原子钟的偏振控制. 这一突破改善了紧计时系统中的频率稳定性.
科学领域:
- 光子学和元表面学
- 原子频率标准 原子频率标准
- 微型电子产品 微型电子产品
背景情况:
- 芯片级原子钟 (CSACs) 需要精确的偏振控制以获得最佳性能.
- 传统的极化元件可能是重的,限制了小型化.
- 超表面为紧的光学功能提供了一个有前途的路线.
研究的目的:
- 设计和演示一个单层超表面作为线性偏振器和四分之一波板 (LP&QWP) 的功能.
- 将这种超表面集成到芯片级原子钟原型中,以提高极化控制和频率稳定性.
- 为了在单一的超表面层内实现同时的极化控制和光功率平衡.
主要方法:
- 用有限差异时间域 (FDTD) 模拟来设计和优化 metasurface.
- 超表面设备是在光学玻璃基板上制造的.
- 实验性表征验证了极化操纵 (PER,DOP) 和CSAC频率稳定性.
主要成果:
- 超表面有效地将线性偏振光转换为右手循环偏振光.
- 达到了4.8dB的极化灭绝比 (PER) 和74.2%的极化度 (DOP).
- 该CSAC原型在1秒钟时表现出9.29 × 10-11的短期频率稳定性,在1万秒钟时表现出1.59 × 10-11的频率稳定性.
结论:
- 开发的超表面为CSACs提供了有效的极化控制.
- 单层超表面可以同时控制极化和光功率平衡.
- 这项工作为微型原子钟的极化控制和频率稳定建立了可行的方法.
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