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- W3065144046 abstract "Some photonic systems support bound states in the continuum (BICs) that have infinite lifetimes, although their frequencies and momenta are matched to vacuum modes. Using a prototypical system that can be treated analytically, we show that each of these BICs always splits into a pair of new type BIC and lasing threshold mode when a parity-time (PT)-symmetric perturbation is introduced. The radiation loss at the lasing threshold is exactly balanced by the net gain of the particles. These PT symmetry-induced BICs are different from ordinary BICs, as they can be excited by an external source but do not radiate, and they carry a different quality factor divergence rate from that of the ordinary BICs. While most of the attention of PT-symmetric systems is captured by the coalescence of modes at exceptional points, the splitting of ordinary BICs is a new phenomenon that illustrates the rich physics embedded in PT-symmetric systems." @default.
- W3065144046 created "2020-08-24" @default.
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- W3065144046 date "2020-08-21" @default.
- W3065144046 modified "2023-10-14" @default.
- W3065144046 title "Coexistence of a new type of bound state in the continuum and a lasing threshold mode induced by PT symmetry" @default.
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- W3065144046 doi "https://doi.org/10.1126/sciadv.abc1160" @default.
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