Kundu, I orcid.org/0000-0002-3564-1903, Dean, P orcid.org/0000-0003-3257-620X, Valavanis, A orcid.org/0000-0001-5565-0463 et al. (4 more authors) (2017) Frequency tunability and spectral control in terahertz quantum cascade lasers with phase-adjusted finite-defect-site photonic lattices. IEEE Transactions on Terahertz Science & Technology, 7 (4). pp. 360-367. ISSN 2156-342X
Abstract
We report on the effect of finite-defect-site photonic lattices (PLs) on the spectral emission of terahertz frequency quantum cascade lasers, both theoretically and experimentally. A central π-phase adjusted defect incorporated in the PL is shown to favor emission selectively within the photonic bandgap. The effect of the duty cycle and the longitudinal position of such PLs is investigated, and used to demonstrate three distinct spectral behaviors: single mode emission from devices in the range 2.2−5 THz, with a side-mode suppression ratio of 40 dB and exhibiting continuous frequency tuning over >8 GHz; discrete tuning between two engineered emission modes separated by ~40 GHz; and, multiple-mode emission with an engineered frequency spacing between emission lines.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ |
Keywords: | gratings; laser tuning; semiconductor lasers; terahertz (THz); quantum cascade lasers (QCLs) |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | 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 EP/J002356/1 Royal Society WM110032 EPSRC EP/J017671/1 Royal Society WM150029 |
Depositing User: | Symplectic Publications |
Date Deposited: | 18 May 2017 15:41 |
Last Modified: | 13 Dec 2024 10:48 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Identification Number: | 10.1109/TTHZ.2017.2707800 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:116616 |