Zeng, Y, Liang, G, Liang, HK et al. (11 more authors) (2016) Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies. ACS Photonics, 3 (12). pp. 2453-2460. ISSN 2330-4022
Abstract
Random lasers are a special class of laser in which light is confined through multiple scattering and interference process in a disordered medium, without a traditional optical cavity. They have been widely studied to investigate fundamental phenomena such as Anderson localization, and for applications such as speckle-free imaging, benefitting from multiple lasing modes. However, achieving controlled localized multi-mode random lasing at long wavelengths, such as in the terahertz (THz) frequency regime, remains a challenge. Here, we study devices consisting of randomly-distributed pillars fabricated from a quantum cascade gain medium, and show that such structures can achieve transversemagnetic polarized (TM) multi-mode random lasing, with strongly localized modes at THz frequencies. The weak short-range order induced by the pillar distribution is sufficient to ensure high quality-factor modes that have a large overlap with the active material. Furthermore, the emission spectrum can be easily tuned by tailoring the scatterer size and filling fraction. These “designer” random lasers, realized using standard photolithography 2 techniques, provide a promising platform for investigating disordered photonics with predesigned randomness in the THz frequency range, and may have potential applications such as speckle-free imaging.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics , copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsphotonics.6b00711. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | random laser, terahertz frequency, quantum cascade laser, multi-mode lasing, localization |
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 Royal Society WM110032 EPSRC EP/J017671/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Jan 2017 12:27 |
Last Modified: | 29 Nov 2017 01:38 |
Published Version: | https://doi.org/10.1021/acsphotonics.6b00711 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsphotonics.6b00711 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:109963 |