Deng, Hai-Yao  ORCID: https://orcid.org/0000-0001-6065-483X
2021.
Near-infrared quantum cascade lasers designed with van der Waals materials.
Physical Review Applied
16
(4)
, 044038.
10.1103/PhysRevApplied.16.044038
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Abstract
Quantum cascade lasers (QCLs) constitute a leading source of coherent radiation in the mid-IR region. However, their performance outside this region remains unsatisfactory. Indeed, there are currently no QCLs in the near-IR region. Here, we propose that a superlattice of atomically thin layers held together by van der Waals forces may operate near room temperature as a compact and powerful near-IR QCL emitting at a wavelength of 1.66 μ m . It can compress over 100 stages within 0.5 μ m . The electric field required for operation is about 3 × 10 6 V~cm − 1 , while the lasing threshold current density is about 22.4 kA~cm − 2 depending on parameters. Rate-equation analysis reveals that the peak power per unit volume can reach over 0.1 mW μ m − 3 in cw operation. Unlike existing QCLs, our device is p -type working with holes.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | American Physical Society |
| ISSN: | 2331-7019 |
| Date of First Compliant Deposit: | 22 October 2021 |
| Date of Acceptance: | 30 September 2021 |
| Last Modified: | 03 May 2023 19:43 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/145014 |
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