Circular Bragg lasers with radial PT symmetry: design and analysis with a coupled-mode approach
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AbstractParity–time (PT) symmetry has been demonstrated in the frame of classic optics. Its applications in laser science have resulted in unconventional control and manipulation of resonant modes. PT-symmetric periodic circular Bragg lasers were previously proposed. Analyses with a transfer-matrix method have shown their superior properties of reduced threshold and enhanced modal discrimination between the radial modes. However, the properties of the azimuthal modes were not analyzed, which restricts further development of circular Bragg lasers. Here, we adopt the coupled-mode theory to design and analyze chirped circular Bragg lasers with radial PT symmetry. The new structures possess more versatile modal control with further enhanced modal discrimination between the azimuthal modes. We also analyze azimuthally modulated circular Bragg lasers with radial PT symmetry, which are shown to achieve even higher modal discrimination.
All Author(s) ListZiyao Feng, Jingwen Ma, Zejie Yu, Xiankai Sun
Journal namePhotonics Research
Volume Number6
Issue Number5
PagesA38 - A42
LanguagesEnglish-United States

Last updated on 2021-22-02 at 00:47