PT-Symmetric Absorber-Laser Enables Electromagnetic Sensors with Unprecedented Sensitivity
PT-Symmetric Absorber-Laser Enables Electromagnetic Sensors with Unprecedented Sensitivity
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DOI：
10.1021/acsphotonics.0c00514
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发表时间：
2020-08-19
期刊：
影响因子：
7
通讯作者：
Chen, Pai-Yen
中科院分区：
文献类型：
--
作者：
Farhat, Mohamed;Yang, Minye;Chen, Pai-Yen
实现非常高的灵敏度是开发新型和更强大的电磁传感器的长期追求的目标。我们在这里介绍如何利用宇称时间（PT）对称性破缺实现的相干完美激光器（CPAL）来构建使用无线电波，微波，太赫兹辐射或光的超灵敏单色电磁传感器。我们认为，使用这样的CPAL传感器来检测非常小规模的扰动所造成的导纳或折射率，例如，低密度气体分子和微观特性的可能性，因为它们可能会大大改变系统的输出强度从非常低（相干吸收）到高（激射）。我们推导出CPAL传感器的物理边界，表明它们的灵敏度和可分辨性可能远远超出传统的电磁传感器，如基于法布里-珀罗腔的传感器。
Achieving extraordinarily high sensitivity is a long-sought goal in the development of novel and more capable electromagnetic sensors. We present here how a coherent perfect absorber-laser (CPAL) enabled by parity-time (PT) symmetry breaking may be exploited to build ultrasensitive monochromatic electromagnetic sensors that use radio waves, microwaves, terahertz radiations, or light. We argue the possibility of using such CPAL sensors to detect extremely small-scale perturbations of admittance or refractive index caused by, for example, low-density gas molecules and microscopic properties, as they may drastically vary the system's output intensity from very low (coherent absorption) to high (lasing). We derive the physical bounds on CPAL sensors, showing that their sensitivity and resolvability may go well beyond traditional electromagnetic sensors, such as sensors based on Fabry-Perot cavities.