论文标题
与长寿命的基本声波相互作用的强烈相互作用
Strong Optomechanical Interactions with Long-lived Fundamental Acoustic Waves
论文作者
论文摘要
现在已将旅行波光学相互作用（称为布里鲁因相互作用）已被确定为光子源，传感器和射频处理器的功能强大且通用的资源。但是，建立的具有足够相互作用强度的基于布里鲁因的相互作用涉及短声子寿命，这严重限制了其应用程序的性能，包括射频过滤和光学机械存储设备。在这里，我们研究了与基本声学模式的光学机械相互作用的新范式，其中相互作用强度与声子寿命相结合，从而使高光机电耦合，长声子寿命，可调的声子频率，可调的声子频率，单个边界带来的独特所需的组合。使用敏感的四波混合光谱光谱控制噪声和空间模式耦合，在锥形纤维中观察到了与长> 2 $μs$ phonon lifetimes的光学机械相互作用，并且强> 2 $μs$ phonon lifetimes和强> 400 $ w^{ - 1} m^{ - 1} $耦合。此外，我们展示了由轴向变化的装置几何形状与长声子寿命的独特组合产生的新型声子自我切除效应。与实验相当一致的广义理论模型是针对非均匀光学机械系统的广泛适用性的。
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 $W^{-1} m^{-1}$ coupling are 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.
