Bifurcated overtones of one-way localized Fabry-Pérot resonances in parity-time symmetric optical lattices

• 来源期刊: 中国物理B（英文版）
• 关键词: optical lattices parity-time symmetry Fabry-Pérot resonances unidirectional field localization
• 年，卷（期）: 2017,（7）
• 页码范围: 178-182
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/7/074218

摘要

Since the first observation of parity-time (PT) symmetry in optics,varied interesting phenomena have been discovered in both theories and experiments,such as PT phase transition and unidirectional invisibility,which turns PT-symmetric optics into a hotspot in research.Here,we report on the one-way localized Fabry-Pérot (FP) resonance,where a welldesigned PT optical resonator may operate at exceptional points with bidirectional transparency but unidirectional field localization.Overtones of such one-way localized FP resonance can be classified into a blue shifted branch and a red shifted branch.Therefore,the fundamental resonant frequency is not the lowest one.We find that the spatial field distributions of the overtones at the same absolute order are almost the same,even though their frequencies are quite different.