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

Song Han; Jieyuan Cui; Yunda Chua; Yongquan Zeng; Liangxing Hu; Mingjin Dai; Fakun Wang; Fangyuan Sun; Song Zhu; Lianhe Li; Alexander Giles Davies; Edmund Harold Linfield; Chuan Seng Tan; Yuri Kivshar; Qi Jie Wang

doi:10.1038/s41377-023-01200-8

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

Original Articles

- Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum
- Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum
- LSA 2023年12卷第7期页码：1337-1345
- Affiliations：
  
  1.Centre for Optoelectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, Singapore, Singapore
  2.Electronic Information School, Wuhan University, Wuhan, China
  3.School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK
  4.Nonlinear Physics Center, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
  5.Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore
- Author bio：
  
  Song Han (song.han@zju.edu.cn)
  Qi Jie Wang (qjwang@ntu.edu.sg)
- Funds：
- DOI：10.1038/s41377-023-01200-8
  中图分类号：
- 纸质出版日期：2023-07-31，
  
  网络出版日期：2023-06-12，
  
  收稿日期：2022-12-30，
  
  修回日期：2023-05-16，
  
  录用日期：2023-05-31
- Accepted：
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Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum[J]. LSA, 2023,12(7):1337-1345.

Han, S. et al. Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum. Light: Science & Applications, 12, 1337-1345 (2023).
Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum[J]. LSA, 2023,12(7):1337-1345. DOI： 10.1038/s41377-023-01200-8.

Han, S. et al. Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum. Light: Science & Applications, 12, 1337-1345 (2023). DOI： 10.1038/s41377-023-01200-8.

摘要

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 to their nonradiative characteristics and robust topological polarization charges in the momentum space. Therefore

the lasing modes show both in-plane and out-of-plane tight confinements in a compact laser cavity (lateral size ~3λ

laser

). Experimentally

we realize a miniaturized THz QCL that shows single-mode lasing with a side-mode suppression ratio (SMSR) around 20 dB. We also observe a cylindrical vector beam for the far-field emission

which is evidence for topological bulk BIC lasers. Our demonstration on miniaturization of single-mode beam-engineered THz lasers is promising for many applications including imaging

sensing

and communications.

关键词

Keywords

references

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