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CPA-lasing associated with the quasibound states in the continuum in asymmetric non-Hermitian structures

Denis V. NovitskyB.I. Stepanov Institute of PhysicsValero, Adia CanosInstitute of Telecommunications, Riga Technical University, Azenes St. 12, 1048 Riga, LatviaKrotov, AlexanderSaint Petersburg Electrotechnical University "LETI" (ETU), Prof. Popova Street 5, 197376 St. Petersburg, RussiaToms SalgalsInstitute of Telecommunications, Riga Technical University, Azenes St. 12, 1048 Riga, LatviaAlexander S. ShalinInstitute of Telecommunications, Riga Technical University, Azenes St. 12, 1048 Riga, LatviaAndrey NovitskyITMO University, Kronverksky Prospekt 49, 197101 St. Petersburg, Russia

2022en

ABI

Annotatsiya

Non-Hermitian photonic systems with loss and gain attract much attention due to their exceptional abilities in molding the flow of light. Introducing asymmetry to the $\mathcal{PT}$-symmetric system with perfectly balanced loss and gain, we reveal the mechanism of transition from the quasibound state in the continuum (quasi-BIC) to the simultaneous coherent perfect absorption (CPA) and lasing in a layered structure comprising epsilon-near-zero (ENZ) media. Two types of asymmetry (geometric and non-Hermitian) are analyzed with the scattering matrix technique. The effect of the CPA-lasing associated with the quasi-BIC is characterized with the unusual linear dependence of the quality factor on the inverse of asymmetry parameter. Moreover, the counter-intuitive loss-induced-lasing-like behavior is found at the CPA-lasing point under the non-Hermitian asymmetry. The reported features of non-Hermitian structures are perspective for sensing and lasing applications.

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Identifikatorlar

DOI: 10.1021/acsphotonics.2c00790

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