Mode coupling is a important issue in a resonant system. A concept of dissipative coupling is proposed in the frame of coupled mode theory. This is a indirect coupling based on coupling of both modes to a highly lossy mode. It is shown that the lossy mode provide a equivalent coupling between two coherent modes. As an example, the theory is applied to a micro-ring to break its chiral symmetry. By carefully designing dissipation and scattering coupling we break chial symmetry of light in the modes-coupling system. The resonant frequencies and modes both in theoretical and numerical results show good agreements. The reflection spectrum show also asymmetry feature. Moreover, the dissipation is usually considered to be harmful for applications and should be avoid in the designation of photonic systems. We believe our finding of symmetry breaking by dissipation coupling will provoke people to utilizing dissipations as a tool for manipulating photons.
Fangjie Shu, Changling Zou, Xu-Bo Zou, and Lan Yang, "Chiral symmetry breaking in micro-ring optical cavity by engineered dissipation (Conference Presentation)," Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 1009005 (Presented at SPIE LASE: January 30, 2017; Published: 21 April 2017); https://doi.org/10.1117/12.2250196.5387835787001.
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