Optomechanical Anti-lasing with Infinite Group Delay at a Phase Singularity

• URL: http://arxiv.org/abs/2112.06521v1
• Date: Mon, 13 Dec 2021 09:51:04 GMT
• Title: Optomechanical Anti-lasing with Infinite Group Delay at a Phase Singularity
• Abstract summary: Singularities that symbolize abrupt changes and exhibit extraordinary behavior are of 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.
• Score: 4.208443304508269
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Singularities that symbolize abrupt changes and exhibit extraordinary behavior are of 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 $\pi$-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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