4.6 Article

Lasing action in Fano-resonant superlattice metagratings

期刊

出版社

IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ac055a

关键词

Fano resonance; lasing; metagrating

资金

  1. National Key R&D Program of China [2018YFB1107200]
  2. National Natural Science Foundation of China (NSFC) [62075084]
  3. Guangdong Provincial Innovation and Entrepreneurship Project [2016ZT06D081]
  4. Guangdong Basic and Applied Basic Research Foundation [2020A1515010615]
  5. Fundamental Research Funds for the Central Universities [21620415]
  6. Guangzhou Science and Technology Program [202102020566]
  7. Natural Science Foundation of China [11761161002, 61775243]
  8. Natural Science Foundation of Guangdong Province [2018B030308005]
  9. Science and Technology Program of Guangzhou [201804020029]

向作者/读者索取更多资源

A proposal of Fano lasing spaser in a superlattice meta-grating is demonstrated, where spatial-temporal lasing dynamics are investigated using a semiclassical model combining full-wave electromagnetic equations and electronic rate equations. The independent tailoring of out-of-phase dark mode and in-phase bright mode supported by the meta-grating by adjusting the width of the thin strip and fat strip in each supercell allows for optimal lasing characteristic. This finding may offer a useful guideline for designing low-threshold and high-efficient miniaturized lasers.
A proposal of Fano lasing spaser is demonstrated in a superlattice meta-grating, in which the spatial-temporal lasing dynamics is investigated by a semiclassical model that involves the coupling between full-wave electromagnetic equations and electronic rate equations. The out-of-phase dark mode and in-phase bright mode supported by the meta-grating can be independently tailored by the width of the thin strip and the fat strip in each supercell of the meta-grating. It provides a facile way to alter the dark/bright mode to overlap the emission/absorption window of a given four-energy-level gain medium simultaneously, in which case the system exhibits the optimal lasing characteristic. Our findings may provide a useful guideline to design low-threshold and high-efficient miniaturized lasers.

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