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Optomechanical Anti-Lasing with Infinite Group Delay at a Phase Singularity
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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7
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Physical Review Letters, Volume 127, issue 27, pp. 1-7
Abstract
Singularities which symbolize abrupt changes and exhibit extraordinary behavior are of a broad interest. We experimentally study optomechanically induced singularities in a compound system consisting of a three-dimensional aluminum superconducting cavity and a metalized high-coherence silicon nitride membrane resonator. Mechanically induced coherent perfect absorption and anti-lasing occur simultaneously under a critical optomechanical coupling strength. Meanwhile, the phase around the cavity resonance undergoes an abrupt π-phase transition, which further flips the phase slope in the frequency dependence. The observed infinite discontinuity in the phase slope defines a singularity, at which the group velocity is dramatically changed. Around the singularity, an abrupt transition from an infinite group advance to delay is demonstrated by measuring a Gaussian-shaped waveform propagating. Our experiment may broaden the scope of realizing extremely long group delays by taking advantage of singularities.
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Funding Information: This work is supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301200), the National Natural Science Foundation of China (Grant No. 12004044, Grants No. 62074091 and No. U1930402), and Science Challenge Project (Grant No. TZ2018003), and by the Academy of Finland (Contracts No. 307757, No. 312057, No. 336810). Publisher Copyright: © 2021 American Physical Society.
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Liu, Y, Liu, Q, Wang, S, Chen, Z, Sillanpää, M A & Li, T 2021, 'Optomechanical Anti-Lasing with Infinite Group Delay at a Phase Singularity', Physical Review Letters, vol. 127, no. 27, 273603, pp. 1-7. https://doi.org/10.1103/PhysRevLett.127.273603