Zeng, Y, Liang, G, Qiang, B et al. (10 more authors) (2018) Two-Dimensional Multimode Terahertz Random Lasing with Metal Pillars. ACS Photonics, 5 (7). pp. 2928-2935.
Abstract
Random lasers employing multiple scattering and interference processes in highly disordered media have been studied for several decades. However, it remains a challenge to achieve a broadband multimode random laser with high scattering efficiency, particularly at long wavelengths. Here, we develop a new class of strongly multimode random lasers in the terahertz (THz) frequency range in which optical feedback is provided by multiple scattering from metal pillars embedded in a quantum cascade (QC) gain medium. Compared with the dielectric pillars or air hole approaches used in previous random lasers, metal pillars provide high scattering efficiency over a broader range of frequencies and with low ohmic losses. Complex emission spectra are observed with over 25 emission peaks across a 0.4 THz frequency range, limited primarily by the gain bandwidth of the QC wafer employed. The experimental results are corroborated by numerical simulations that show the lasing modes are strongly localized.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2018 American Chemical Society. This is an author produced version of a paper published in ACS Photonics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | localization; multimode lasing; quantum cascade laser; random laser; terahertz frequency |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/P021859/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 19 Jul 2018 09:48 |
Last Modified: | 13 Jun 2019 00:41 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsphotonics.8b00260 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:133463 |