Journal
ACS PHOTONICS
Volume 5, Issue 7, Pages 2928-2935Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00260
Keywords
random laser; terahertz frequency; quantum cascade laser; multimode lasing; localization
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Funding
- Singapore Ministry of Education [MOE 2016-T2-1-128]
- Agency for Science, Technology and Research (A*STAR) [1426500050]
- Singapore National Research Foundation Competitive Research Program [NRF-CRP18-2017-02]
- Engineering and Physical Sciences Research Council (EPSRC), UK (HyperTerahertz programme) [EP/P021859/1]
- Royal Society
- Wolfson Foundation
- EPSRC [EP/P021859/1] Funding Source: UKRI
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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.
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