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Low-threshold lasing from bound states in the continuum with dielectric metasurfaces

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Abstract

Bound states in the continuum (BICs) with extremely large quality factors (Q factors) can enhance the light–matter interaction and thus achieve low-threshold lasing. Here, we theoretically propose and experimentally demonstrate the low-threshold lasing at room temperature based on BICs. A threshold of approximately 306.7 W/cm2 (peak intensity) under a 7.5 ns-pulsed optical excitation is presented in an all-dielectric metasurface system consisting of titanium dioxide (TiO2) nanopillars with a dye film. Also, the multimode lasing can be excited by the higher pumping. Our results may find exciting applications in on-chip coherent light sources, filtering, and sensing.

© 2023 Optica Publishing Group

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Corrections

11 December 2023: Typographical corrections were made to the author affiliations.


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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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