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Title: Two-dimensional multimode terahertz random lasing with metal pillars
Authors: Zeng, Yongquan
Liang, Guozhen
Qiang, Bo
Wu, Kedi
Tao, Jing
Hu, Xiaonan
Li, Lianhe
Davies, Alexander Giles
Linfield, Edmund Harold
Liang, Hou Kun
Zhang, Ying
Chong, Yidong
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Zeng, Y., Liang, G., Qiang, B., Wu, K., Tao, J., Hu, X., ... Wang, Q. J. (2018). Two-dimensional multimode terahertz random lasing with metal pillars. ACS Photonics, 5(7), 2928-2935. doi:10.1021/acsphotonics.8b00260
Journal: ACS Photonics
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.
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.8b00260
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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