CPA-Lasing Associated with the Quasibound States in the Continuum in Asymmetric Non-Hermitian Structures
ACS Photonics 2022
Denis Novitsky, Adria Canos Valero, Aleksandr Krotov, Toms Salgals, Aleksandr Shalin, Andrey Novitsky

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 -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 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 the 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.


Atslēgas vārdi
bound states in the continuum, coherent perfect absorption, lasing, scattering matrix, multilayer structure
DOI
10.1021/acsphotonics.2c00790
Hipersaite
https://pubs.acs.org/doi/10.1021/acsphotonics.2c00790

Novitsky, D., Valero, A., Krotov, A., Salgals, T., Shalin, A., Novitsky, A. CPA-Lasing Associated with the Quasibound States in the Continuum in Asymmetric Non-Hermitian Structures. ACS Photonics, 2022, Vol. 9, No. 9, 3035.-3042.lpp. ISSN 2330-4022. Pieejams: doi:10.1021/acsphotonics.2c00790

Publikācijas valoda
English (en)
RTU Zinātniskā bibliotēka.
E-pasts: uzzinas@rtu.lv; Tālr: +371 28399196