Author Affiliations
Abstract
Anhui Key Laboratory of Optoelectric Materials Science and Technology, School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, China
The temporal coupled-mode theory (TCMT) has made significant progress in recent years, and is widely applied in explaining a variety of optical phenomena. In this paper, the optical characteristics of the metasurface composed of nano-bars and nano-rings are simulated. The simulation results are well explained by TCMT under the coupled basis vector. However, when the structural asymmetry is large, the fitting of results shows that the total radiation loss is not conservative, in contradiction to the requirement of traditional TCMT. We solved this inconsistency by introducing the propagation phase into the near-field coupling term of TCMT. The studies show that, unlike the local mode near the exceptional point which corresponds to the radiation loss of the bright mode, the global mode near the diabolic point is closely related to the propagation phase. Furthermore, the structure near the diabolic point shows characteristic cross-coupling with the change of period. This study proposes a new theoretical framework for comprehending the interaction of light and matter and offers some guiding implications for the application of TCMT to a variety of related domains.
temporal coupled-mode theory exception point diabolic point propagation phase Chinese Optics Letters
2023, 21(1): 010003
安徽师范大学物理与电子信息学院,安徽 芜湖 241000
基于两个子系统的复合体系的纠缠度可以用复合体系密度矩阵的部分转置矩阵负本征值来定义的特性,利用数值模拟方法研究了与单模粒子数场进行相互作用的Tavis-Cummings模型中两原子的纠缠的时间演化。当考虑两原子初始处于混态时,结果表明,粒子数场的初始态、两原子的初始态以及两原子与粒子数光场的耦合常数的大小都对两个原子间纠缠度的时间演化特性有着显著的影响。
量子光学 Tavis-Cummings模型 部分转置矩阵负本征值 量子纠缠 quantum optics Tavis-Cummings model negative eigenvalues of the partial transposition quantum entanglement