Lasing with Resonant Feedback in Weakly Modulated Parity-Time Symmetric Lattices
IEEE photonics journal(2018)
摘要
We report on the lasing action in weakly modulated parity-time (PT) symmetric lattices. At the exceptional point in PT-symmetric lattices, the amplitude and phase of unidirectionally scattered waves are independently and flexibly determined by the PT modulations, thus, providing a distinctive route to construct a lasing mode in finite systems with weakly modulated structures. It is revealed that the resonant feedback mechanism plays a crucial role in building up the lasing action. Our finding would enrich the singularity dynamics in the weakly modulated PT systems.
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关键词
Parity-time symmetry,lasing,resonant feedback
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