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arXiv · 2112.06521

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

Yulong Liu·Qichun Liu·Shuaipeng Wang·Zhen Chen·Mika A. Sillanpää·Tiefu Li
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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 $π$-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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Yulong Liu, Qichun Liu, Shuaipeng Wang, Zhen Chen, Mika A. Sillanpää, Tiefu Li. 2021-12-13. Optomechanical Anti-lasing with Infinite Group Delay at a Phase Singularity. https://doi.org/10.1103/physrevlett.127.273603

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