Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum.

ABSTRACT: One of the most exciting breakthroughs in physics is the concept of topology that was recently introduced to photonics, achieving robust functionalities, as manifested in the recently demonstrated topological lasers. However, so far almost all attention was focused on lasing from topological edge states. Bulk bands that reflect the topological bulk-edge correspondence have been largely missed. Here, we demonstrate an electrically pumped topological bulk quantum cascade laser (QCL) operating in the terahertz (THz) frequency range. In addition to the band-inversion induced in-plane reflection due to topological nontrivial cavity surrounded by a trivial domain, we further illustrate the band edges of such topological bulk lasers are recognized as the bound states in the continuum (BICs) due t

SUBMITTER: Han S 

PROVIDER: S-EPMC10261106 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature