Lei, Danqi;
Wang, Ji Tong;
Ratiu, Bogdan-Petrin;
Deng, Huiwen;
Zhang, Xuanchang;
Yan, Zhao;
Huo, Suguo;
... Tang, Mingchu; + view all
(2025)
Ultralow-threshold single-mode quantum-dot laser operating at O-band based on bound-states in the continuum.
Journal of Physics D: Applied Physics
, 58
(41)
, Article 415105. 10.1088/1361-6463/ae0b80.
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Abstract
Light sources for generation of optical angular momentum (OAM) are popular on telecommunication systems and in demand for key telecommunications platforms, including on-chip ultra-compact integrated communication systems, free-space optical communication and optical fiber networks. Here, we demonstrate an ultralow-threshold laser based on optical bound states in the continuum (BIC), which serves as an ideal light source for generation of beams with OAM. In this context, given semiconductor material stability and robustness, the proposed BIC laser, comprising an InAs/GaAs quantum-dot (QD) active region and lasing at a wave-length of ∼1.3 μm, is characterized by a power threshold of 7.5 μW (0.038 kW cm<sup>−2</sup>) at room temperature. Moreover, our experimental measurements and computational analysis of the generated optical field reveal the vortex nature of the optical beam, as well as its non-trivial topological properties. This work demonstrates an energy-efficient, stable, and versatile single-mode QD BIC laser, which, as a source of optical vortex beams with large light extraction efficiency, offers great potential to facilitate high-capacity data transmission in future optical communication systems.
| Type: | Article |
|---|---|
| Title: | Ultralow-threshold single-mode quantum-dot laser operating at O-band based on bound-states in the continuum |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1361-6463/ae0b80 |
| Publisher version: | https://doi.org/10.1088/1361-6463/ae0b80 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Physics, Applied, Physics, bound states in the continuum, orbital angular momentum, quantum dots, laser, vortex beam, MOMENTUM, BEAMS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10217008 |
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