Wang Liyong, Zhao Yinxue, Di Ke, Du Jiajia
Opt Express. 2024 Jun 3;32(12):20695-20705. doi: 10.1364/OE.510420.
We propose an ultrahigh-efficiency and broadband all-optical switching scheme based on coherent perfect absorption (CPA) in linear and nonlinear excitation regimes in a cavity quantum electrodynamics (CQED) system. Two separate atomic transitions are excited simultaneously by two signal fields coupled from two ends of an optical cavity under the collective strong coupling condition. Three polariton eigenstates are produced which can be tuned freely by varying system parameters. The output field intensities of multiple channels are zero when the CPA criterion is satisfied. However, destructive quantum interference can be induced by a free-space weak control laser when it is tuned to be resonant to the polariton state. As a consequence, the CQED system acts as a coherent perfect light absorber/transmitter as the control field is turned on/off the polariton resonances. In particular, the proposed scheme may be used to realize broadband multi-throw all-optical switching in the nonlinear excitation regime. The proposed scheme is useful for constructing all-optical routing, all-optical communication networks and various all-optical logic elements.
我们提出了一种基于腔量子电动力学（CQED）系统中线性和非线性激发机制下的相干完美吸收（CPA）的超高效宽带全光开关方案。在集体强耦合条件下，由光腔两端耦合的两个信号场同时激发两个独立的原子跃迁。产生了三个极化激元本征态，可通过改变系统参数自由调节。当满足CPA准则时，多个通道的输出场强度为零。然而，当自由空间弱控制激光调谐到与极化激元态共振时，会引发相消量子干涉。因此，当控制场开启/关闭极化激元共振时，CQED系统可作为相干完美光吸收器/发射器。特别地，所提出的方案可用于在非线性激发机制下实现宽带多掷全光开关。该方案对于构建全光路由、全光通信网络和各种全光逻辑元件具有重要意义。
