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. 2023 Apr 7;130(14):146702.
doi: 10.1103/PhysRevLett.130.146702.

Coherent Microwave Emission of Gain-Driven Polaritons

Bimu Yao  1   2   3 , Y S Gui  1 , J W Rao  1   3 , Y H Zhang  1 , Wei Lu  2   3 , C-M Hu  1
Affiliations

Coherent Microwave Emission of Gain-Driven Polaritons

Bimu Yao et al. Phys Rev Lett. .

Abstract

By developing a gain-embedded cavity magnonics platform, we create a gain-driven polariton (GDP) that is activated by an amplified electromagnetic field. Distinct effects of gain-driven light-matter interaction, such as polariton auto-oscillations, polariton phase singularity, self-selection of a polariton bright mode, and gain-induced magnon-photon synchronization, are theoretically studied and experimentally manifested. Utilizing the gain-sustained photon coherence of the GDP, we demonstrate polariton-based coherent microwave amplification (∼40 dB) and achieve high-quality coherent microwave emission (Q>10^{9}).

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