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Updated: May 15, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Chiral lasing enabled by strong coupling
Huachun Deng1, Xiong Jiang1, Yao Zhang1
1Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology, Shenzhen 518055, P. R. China.
Abstract:
Chiral quasi-bound states in the continuum are spin-dependent high-Q resonances in meta-photonic structures that are realized by perturbing symmetry-protected optical states by engineering in-plane and out-of-plane asymmetries, and they support chiral lasing in the vertical direction. Here, we explore the coupling between two resonances in a chiral metasurface and introduce a mechanism for high-purity chiral laser emission. We reveal that two resonances with nearly orthogonal polarizations become strongly coupled in an engineered chiral metasurface. The inherent phase difference of the resonances, associated with the coherent destruction on the decay channel, can endow high-Q factor and maximize chirality to one of the hybrid modes. We verify this approach experimentally by measuring transmission spectra, angle-resolved photoluminescence, and laser emission. We believe that this mechanism allows breaking restrictions on conventional chiral quasi-BIC lasing, enabling the realization of chiral emission at any designed direction.
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