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Near-infrared quantum cascade lasers designed with van der Waals materials

Deng, Hai-Yao 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: 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: 26 Oct 2021 09:47
URI: https://orca.cardiff.ac.uk/id/eprint/145014

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