论文标题
纳米量波导中的光力梯度力引起的自发参数下转换
Spontaneous parametric down-conversion induced by optomechanical gradient forces in nanophotonic waveguides
论文作者
论文摘要
光力学梯度力是由平行光子波导中引导波的evaneSent场引起的。当设计具有吸引力的性质时，它们会随着波导之间的差距的减小而呈指数增加。此外，由于其线性依赖于输入激光器功率，因此可以很好地控制梯度力的幅度。在这里，我们建议利用光力梯度力的固有非线性性质，以在两个双重夹紧的纳米光束的基本模式之间诱导可调的3波耦合。对于一个具有另一个光束宽度一半的梁之一，基本模式之间的1：2内部共振支持简并自发参数下转化（SPDC）。从理论上讲，我们探讨了基础退化参数振荡器模型的耗散相图的主要特征，以表明SPDC的临界点出现在最符合最新实验的参数上。
Optomechanical gradient forces arise from evanescent fields of guided waves in parallel photonic waveguides. When designed to be of attractive nature, they increase exponentially as the gap between the waveguides decreases. Moreover, the amplitude of the gradient force can be well controlled due to its linear dependence on the input laser power. Here, we propose to exploit the intrinsic nonlinear nature of the optomechanical gradient force to induce a tunable 3-wave coupling between the fundamental modes of two doubly clamped nanophotonic beams. For one of the beams having half the width of the other beam, the 1:2 internal resonance between the fundamental modes supports degenerate spontaneous parametric down-conversion (SPDC). We theoretically explore the main feature of the dissipative phase diagram of the underlying degenerate parametric oscillator model to show that the critical point of the SPDC occurs at parameters which are well in reach of state-of-the-art experiments.
