Electrostrictive Brillouin scattering provides a ubiquitous mechanism to optically excite high-frequency ($>10\mathrm{GHz}$), bulk acoustic phonons that are robust to surface-induced losses. Resonantly enhancing such photon-phonon interactions in high-$Q$ microresonators has spawned diverse applications spanning microwave to optical domains. However, tuning both the pump and scattered waves into resonance usually comes with the cost of photon confinement or modal overlap, leading to limited optomechanical coupling. Here, we introduce Bragg scattering to realize strong bulk optomechanical coupling in the same spatial modes of a micron-sized supermode microresonator. A single-photon optomechanical coupling rate up to 12.5 kHz is demonstrated, showing more than 10 times improvement than other devices. Low-threshold phonon lasing and optomechanical strong coupling are also observed for the 10.2-GHz mechanical mode. Our work establishes a compact and efficient paradigm to optically control bulk acoustic phonons, paving the way toward optomechanical coupling at the single-photon level and providing a powerful engine for large-scale integration of quantum networks in which quantum states are massively transferred and stored.

中文翻译：

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使用超模微谐振器驯服布里渊光力学

电致伸缩布里渊散射提供了一种普遍存在的机制来光学激发高频（$>10\mathrm{兆赫}$），体声声子对表面引起的损耗具有鲁棒性。共振增强高光子-声子相互作用$问$微谐振器催生了从微波到光学领域的多种应用。然而，将泵浦波和散射波调谐到共振通常会带来光子限制或模态重叠的成本，从而导致光机械耦合有限。在这里，我们引入布拉格散射，以在微米级超模微谐振器的相同空间模式下实现强体光机械耦合。展示了高达 12.5 kHz 的单光子光机耦合率，比其他器件提高了 10 倍以上。在 10.2 GHz 机械模式下还观察到低阈值声子激光和光机械强耦合。我们的工作建立了一种紧凑而高效的范例来光学控制体声声子，为单光子水平的光机械耦合铺平了道路，并为量子网络的大规模集成提供了强大的引擎，在量子网络中量子态被大规模转移和存储。