Strong Optomechanical Interactions with Long-lived Fundamental Acoustic Waves
Strong Optomechanical Interactions with Long-lived Fundamental Acoustic Waves
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DOI：
10.1364/optica.476764
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发表时间：
2022-06
期刊：
影响因子：
10.4
通讯作者：
Wendao Xu;A. Iyer;Lei Jin;S. Set;W. Renninger
中科院分区：
文献类型：
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作者：
Wendao Xu;A. Iyer;Lei Jin;S. Set;W. Renninger
行波光机械相互作用，被称为布里渊相互作用，现在已经被确立为光子源，传感器和射频处理器的强大和通用的资源。然而，具有足够相互作用强度的基于布里渊的相互作用涉及短的声子寿命，这严重限制了它们在包括射频滤波和光机械存储设备的应用中的性能。在这里，我们研究了一个新的范例的光机械相互作用与基本的声学模式，相互作用的强度是从声子寿命解耦，使独特的理想的组合高光机械耦合，长声子寿命，可调谐的声子频率，和单边带放大。利用灵敏的四波混频光谱控制噪声和空间模耦合，在锥形光纤中观察到了声子寿命大于2 μs、耦合大于400的光-机相互作用。此外，我们展示了新颖的声子自干涉效应，从一个轴向变化的设备的几何形状与长的声子寿命的独特组合。一个广义的理论模型，在良好的协议与实验，具有广泛的适用性，非均匀光机系统的发展。
Traveling-wave optomechanical interactions, known as Brillouin interactions, have now been established as a powerful and versatile resource for photonic sources, sensors, and radio-frequency processors. However, established Brillouin-based interactions with sufficient interaction strengths involve short phonon lifetimes, which critically limit their performance for applications including radio-frequency filtering and optomechanical storage devices. Here, we investigate a new paradigm of optomechanical interactions with fundamental acoustic modes, where interaction strength is decoupled from phonon lifetimes, enabling the uniquely desirable combination of high optomechanical coupling, long phonon lifetimes, tunable phonon frequencies, and single-sideband amplification. Using sensitive four-wave mixing spectroscopy controlling for noise and spatial mode coupling, optomechanical interactions with long > 2 μs phonon lifetimes and strong > 400 coupling is observed in a tapered fiber. In addition, we demonstrate novel phonon self-interference effects resulting from the unique combination of an axially varying device geometry with long phonon lifetimes. A generalized theoretical model, in excellent agreement with experiments, is developed with broad applicability to inhomogeneous optomechanical systems.