Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows

Abstract

We report room temperature heterodyne detection of a quantum cascade laser beaten with a local oscillator on a unipolar quantum photodetector in two different atmospheric windows, at 4.8 µm and 9 µm. A noise equivalent power of few pW is measured by employing an active stabilization technique in which the local oscillator and the signal are locked in phase. The measured heterodyne noise equivalent power is six orders of magnitude lower than that obtained with direct detection.

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Item Type:	Article
Authors/Creators:	Saemian, M. https://orcid.org/0009-0009-7740-6977 Del Balzo, L. https://orcid.org/0009-0007-3262-6330 Gacemi, D. https://orcid.org/0000-0003-0334-1815 Todorov, Y. https://orcid.org/0000-0002-2359-1611 Rodriguez, E. https://orcid.org/0000-0002-2397-1956 Lopez, O. Darquié, B. Li, L. https://orcid.org/0000-0003-4998-7259 Davies, A.G. https://orcid.org/0000-0002-1987-4846 Linfield, E. https://orcid.org/0000-0001-6912-0535 Vasanelli, A. https://orcid.org/0000-0003-1945-2261 Sirtori, C. https://orcid.org/0000-0003-1817-4554
Copyright, Publisher and Additional Information:	© 2024 the author(s), published by De Gruyter. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords:	infrared detection; unipolar quantum devices; frequency stabilization
Dates:	Published (online): 18 January 2024 Accepted: 21 December 2023
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds)
Funding Information:	Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/W028921/1
Depositing User:	Symplectic Publications
Date Deposited:	22 Jan 2024 16:35
Last Modified:	30 Jan 2024 14:05
Published Version:	http://dx.doi.org/10.1515/nanoph-2023-0787
Status:	Published online
Publisher:	Walter de Gruyter
Identification Number:	10.1515/nanoph-2023-0787
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:208001

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Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows

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