Majeed, A., Ivanov, P., Stevens, B. et al. (5 more authors) (2019) Broadband THz absorption spectrometer based on excitonic nonlinear optical effects. Light: Science and Applications, 8. 29. ISSN 2095-5545
Abstract
A broadly tunable THz source is realized via difference frequency generation, in which an enhancement to χ (3) that is obtained via resonant excitation of III–V semiconductor quantum well excitons is utilized. The symmetry of the quantum wells (QWs) is broken by utilizing the built-in electric-field across a p–i–n junction to produce effective χ (2) processes, which are derived from the high χ (3) . This χ (2) media exhibits an onset of nonlinear processes at ~4 W cm −2 , thereby enabling area (and, hence, power) scaling of the THz emitter. Phase matching is realized laterally through normal incidence excitation. Using two collimated 130 mW continuous wave (CW) semiconductor lasers with ~1-mm beam diameters, we realize monochromatic THz emission that is tunable from 0.75 to 3 THz and demonstrate the possibility that this may span 0.2–6 THz with linewidths of ~20 GHz and efficiencies of ~1 × 10 –5 , thereby realizing ~800 nW of THz power. Then, transmission spectroscopy of atmospheric features is demonstrated, thereby opening the way for compact, low-cost, swept-wavelength THz spectroscopy.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Author(s).This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 22 Mar 2019 14:49 |
Last Modified: | 25 Jun 2023 21:46 |
Status: | Published |
Publisher: | Springer Nature [academic journals on nature.com] |
Refereed: | Yes |
Identification Number: | 10.1038/s41377-019-0137-y |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:144015 |