$\mathcal{P}\mathcal{T}$-symmetric microring laser-absorber

Abstract

The lasing and coherent perfect absorption (CPA) properties of $\mathcal{P}\mathcal{T}$-symmetric microrings with mixed index and gain gratings, externally coupled to a bus waveguide, are theoretically investigated. For a complex grating at the $\mathcal{P}\mathcal{T}$ symmetry breaking point, perfect unidirectional (either clockwise or counterclockwise) laser emission can be realized, however the grating does not discriminate longitudinal modes and CPA can not be simultaneously achieved. Above the grating $\mathcal{P}\mathcal{T}$ symmetry breaking point, single mode emission and simultaneous CPA can be obtained, with unbalanced and controllable excitation of clockwise and counterclockwise modes in the ring.

5 pages, 3 figures, to appear in Optics Letters

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• Parity-Time Symmetric Coupled Microresonators with a Dispersive Gain/Loss
• Half-spectral unidirectional invisibility in non-Hermitian periodic optical structures
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• Amplified and directional spontaneous emission from arbitrary composite bodies: self-consistent treatment of Purcell effect below threshold
• Characterization of Parity-Time Symmetry in Photonic Lattices Using Heesh-Shubnikov Group Theory
• Theory and Numerical Modelling of Parity-Time Symmetric Structures in Photonics: Introduction and Grating Structures in One Dimension
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