论文标题
悬浮的1D光子晶体纳米腔中的慢速热力学脉动
Slow thermo-optomechanical pulsations in suspended 1D photonic crystal nanocavities
论文作者
论文摘要
我们研究了在氮化硅芯片上制造的悬浮的1D光子晶体纳米腔的非线性光学响应。对于低至$ 2 \，μ\ text {w} $的输入功率，证明了强烈的热光非线性，并且显示出一种自我维持的脉冲制度，显示出几秒钟的周期性。随着输入功率和激光波长的变化，时间模式的周期，占空比和形状变化。这种动力学归因于热光学和热力学效应之间的多个时间尺度竞争，并且与神经元活性数学模型中发现的弛豫振荡态度非常相似。我们介绍了一个简化的模型，该模型重现了所有实验观察结果，并允许我们根据控制系统缓慢演变的一维临界流形的特性来解释它们。
We investigate the nonlinear optical response of suspended 1D photonic crystal nanocavities fabricated on a silicon nitride chip. Strong thermo-optical nonlinearities are demonstrated for input powers as low as $2\,μ\text{W}$ and a self-sustained pulsing regime is shown to emerge with periodicity of several seconds. As the input power and laser wavelength are varied the temporal patterns change in period, duty cycle and shape. This dynamics is attributed to the multiple timescale competition between thermo-optical and thermo-optomechanical effects and closely resembles the relaxation oscillations states found in mathematical models of neuronal activity. We introduce a simplified model that reproduces all the experimental observations and allows us to explain them in terms of the properties of a 1D critical manifold which governs the slow evolution of the system.
