Topological laser on square lattice with gain-loss-induced higher-order corner modes

doi:10.1088/1674-1056/ad322a

Abstract We investigate the higher-order topological laser in the two-dimensional (2D) coupled-cavity array. By adding staggered on-site gain and loss to the 2D Hermitian array with a trivial phase, the system will emerge degenerate topological corner modes, which are protected by bulk band gap. For such a non-Hermitian model, by adjusting the parameters of the system and introducing the pumping into the cavity at the corner, a single-mode lasing with topological protection emerges. Furthermore, single-mode lasing exists over a wide range of pumping strengths. No matter where the cavity is initially stimulated, after enough time evolution, all the cavities belonging to the topological corner mode can emit a stable laser.

Keywords: topological corner modes nonlinear saturated gain single-mode lasing

Received: 26 December 2023
Revised: 26 February 2024
Accepted manuscript online: 11 March 2024

PACS:	03.65.Vf	(Phases: geometric; dynamic or topological)
	03.65.Vf	(Phases: geometric; dynamic or topological)
	42.60.By	(Design of specific laser systems)
	42.60.-v	(Laser optical systems: design and operation)

Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12274326 and 12174288) and the National Key R&D Program of China (Grant No. 2021YFA1400602).

Corresponding Authors: Jingping Xu, Yaping Yang
E-mail: xx_jj_pp@tongji.edu.cn；yang_yaping@tongji.edu.cn

Cite this article:

Ming-Jie Liao(廖明杰), Mei-Song Wei(韦梅松), Shuailing Wang(王帅领), Jingping Xu(许静平), and Yaping Yang(羊亚平) Topological laser on square lattice with gain-loss-induced higher-order corner modes 2024 Chin. Phys. B 33 060305

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Topological laser on square lattice with gain-loss-induced higher-order corner modes

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