Journal
ACS PHOTONICS
Volume 3, Issue 12, Pages 2453-2460Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00711
Keywords
random laser; terahertz frequency; quantum cascade laser; multimode lasing; localization
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Funding
- Singapore National Research Foundation, Competitive Research Program [NRF2015 NRF-CRP002-008]
- Singapore Ministry of Education Tier 2 Program [MOE2016-T2-1-128]
- SERC from the Agency for Science, Technology and Research (A*STAR), Singapore [1426500050]
- Engineering and Physical Sciences Research Council [EP/J017671/1]
- Singapore National Research Foundation [NRFF2012-02]
- Royal Society
- Wolfson Foundation
- Engineering and Physical Sciences Research Council [EP/J017671/1] Funding Source: researchfish
- EPSRC [EP/J017671/1] Funding Source: UKRI
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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, benefiting from multiple lasing modes. However, achieving controlled localized multimode 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 transverse-magnetic polarized (TM) multimode 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 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.
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