Hu Ma-Long, Yang Zhong-Jian, Du Xiao-Jing, Ma Lin, He Jun
Opt Express. 2021 Aug 2;29(16):26028-26038. doi: 10.1364/OE.434586.
Here we theoretically investigate the coherent interactions between the quantum emitters with magnetic dipole transitions and subwavelength all-dielectric resonators of whispering gallery modes (WGMs). We extend a semi-analytical method which can efficiently calculate the far-field spectrum of a general hybrid system. Then, a subwavelength sphere with refractive index around n = 3.5 is chosen as the dielectric resonator. Due to the high magnetic field enhancements of the WGMs of the sphere, strong couplings between magnetic quantum emitters and subwavelength WGMs can occur, where a clear Rabi splitting appears on the extinction spectrum of the hybrid system. The match between the relaxation times of the WGMs and emitters are important to efficiently achieve a strong enough coupling. The other parameters including the order of a WGM, the radius, the refractive index, the transition dipole moment and excitation intensity are also important factors that can affect the couplings. Our results pave the way for strong interactions between light and magnetic emitters mediated by subwavelength all-dielectric resonators.
在此，我们从理论上研究了具有磁偶极跃迁的量子发射器与回音壁模式（WGMs）的亚波长全介质谐振器之间的相干相互作用。我们扩展了一种半解析方法，该方法能够有效地计算一般混合系统的远场光谱。然后，选择折射率约为n = 3.5的亚波长球体作为介质谐振器。由于球体WGMs具有高磁场增强效应，磁量子发射器与亚波长WGMs之间会发生强耦合，在混合系统的消光光谱上会出现明显的拉比分裂。WGMs与发射器的弛豫时间匹配对于有效实现足够强的耦合很重要。包括WGM的阶数、半径、折射率、跃迁偶极矩和激发强度在内的其他参数也是影响耦合的重要因素。我们的结果为亚波长全介质谐振器介导的光与磁发射器之间的强相互作用铺平了道路。
