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Title: Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum
Authors: Han, Song
Cui, Jieyuan
Chua, Yunda
Zeng, Yongquan
Hu, Liangxing
Dai, Mingjin
Wang, Fakun
Sun, Fangyuan
Zhu, Song
Li, Lianhe
Davies, Alexander Giles
Linfield, Edmund Harold
Tan, Chuan Seng
Kivshar, Yuri
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2023
Source: Han, S., Cui, J., Chua, Y., Zeng, Y., Hu, L., Dai, M., Wang, F., Sun, F., Zhu, S., Li, L., Davies, A. G., Linfield, E. H., Tan, C. S., Kivshar, Y. & Wang, Q. J. (2023). Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum. Light, Science & Applications, 12(1), 145-.
Project: MOE-T2EP50120-0009 
Journal: Light, Science & Applications 
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 ~3λlaser). 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.
ISSN: 2047-7538
DOI: 10.1038/s41377-023-01200-8
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Centre for Optoelectronics and Biophotonics
The Photonics Institute 
Rights: © The Author(s) 2023. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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SPMS Journal Articles

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