Topological polarization singular lasing with highly efficient radiation channel

Yun-Gang Sang, Jing-Yu Lu, Yun-Hao Ouyang, Hong-Yi Luan, Jia-Hao Wu, Jia-Yong Li and Ren-Min Ma ()
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Yun-Gang Sang: Peking University
Jing-Yu Lu: Peking University
Yun-Hao Ouyang: Peking University
Hong-Yi Luan: Peking University
Jia-Hao Wu: Peking University
Jia-Yong Li: Peking University
Ren-Min Ma: Peking University

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract Bound states in the continuum (BICs) in photonic crystals describe the originally leaky Bloch modes that can become bounded when their radiation fields carry topological polarization singularities. However, topological polarization singularities do not carry energy to far field, which limits radiation efficiencies of BICs for light emitting applications. Here, we demonstrate a topological polarization singular laser which has a topological polarization singular channel in the second Brillouin zone and a paired linearly polarized radiation channel in the first Brillouin zone. The presence of the singular channel enables the lasing mode with a higher quality factor than other modes for single mode lasing. In the meanwhile, the presence of the radiation channel secures the lasing mode with high radiation efficiency. The demonstrated topological polarization singular laser operates at room temperature with an external quantum efficiency exceeding 24%. Our work presents a new paradigm in eigenmode engineering for mode selection, exotic field manipulation and lasing.

Date: 2022
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DOI: 10.1038/s41467-022-34307-4

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