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

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Title: Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum
Authors: Han, S, Cui, J, Chua, Y, Zeng, Y, Hu, L, Dai, M, Wang, F, Sun, F, Zhu, S, Li, L, Davies, AG, Linfield, EH, Tan, CS, Kivshar, Y, Wang, QJ
Publisher Information: Springer Nature
Publication Year: 2023
Collection: White Rose Research Online (Universities of Leeds, Sheffield & York)
Description: 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.
Document Type: article in journal/newspaper
File Description: text
Language: English
ISSN: 2047-7538
Relation: https://eprints.whiterose.ac.uk/id/eprint/200491/1/s41377-023-01200-8.pdf; Han, S, Cui, J, Chua, Y et al. (12 more authors) (2023) Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum. Light: Science & Applications, 12. 145. ISSN: 2047-7538
Availability: https://eprints.whiterose.ac.uk/id/eprint/200491/
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Accession Number: edsbas.33AC341
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  Data: Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum
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  Data: 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.
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  Data: https://eprints.whiterose.ac.uk/id/eprint/200491/1/s41377-023-01200-8.pdf; Han, S, Cui, J, Chua, Y et al. (12 more authors) (2023) Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum. Light: Science & Applications, 12. 145. ISSN: 2047-7538
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