Photonics Research, 2019, 7 (6): 06000647, Published Online: May. 17, 2019
Mode splitting revealed by Fano interference Download: 535次
Abstract
An optical whispering gallery mode (WGM) resonator supports degenerate counter-propagating modes and the degeneracy is lifted as mode splitting due to Rayleigh scattering. However, quantitative analysis becomes difficult if the resonance experiences weak scattering. Here we develop a spectroscopical method to identify an arbitrary small scatterer using the Fano interference-induced spectral response modification. Scattering information can be revealed by fitting the responses as a function of the field’s phase and intensity. In addition, we show that this modified response helps achieve an ultra-low detection limit for the mode-splitting-based nanoparticle detection method. This approach may be promising in the characterization of high-Q -factor devices, novel sensing methods, and quantum coupling system investigation.
Yue Wang, Hongchun Zhao, Yancheng Li, Fengfeng Shu, Mingbo Chi, Yang Xu, Yihui Wu. Mode splitting revealed by Fano interference[J]. Photonics Research, 2019, 7(6): 06000647.