Johnson Thomas J, Borselli Matthew, Painter Oskar
Opt Express. 2006 Jan 23;14(2):817-31. doi: 10.1364/opex.14.000817.
Direct time-domain observations are reported of a low-power, self-induced modulation of the transmitted optical power through a high-Q silicon microdisk resonator. Above a threshold input power of 60 microW the transmission versus wavelength deviates from a simple optical bistability behavior, and the transmission intensity becomes highly oscillatory in nature. The transmission oscillations are seen to consist of a train of sharp transmission dips of width approximately 100 ns and period close to 1 micros. A model of the system is developed incorporating thermal and free-carrier dynamics, and is compared to the observed behavior. Good agreement is found, and the self-induced optical modulation is attributed to a nonlinear interaction between competing free-carrier and phonon populations within the microdisk.
报道了通过高Q值硅微盘谐振器对传输光功率进行低功率、自感应调制的直接时域观测结果。当输入功率超过60微瓦的阈值时，传输与波长的关系偏离了简单的光学双稳行为，并且传输强度在本质上变得高度振荡。传输振荡表现为由一系列宽度约为100纳秒、周期接近1微秒的尖锐传输凹陷组成。建立了一个包含热和自由载流子动力学的系统模型，并将其与观测到的行为进行了比较。发现两者吻合良好，且自感应光调制归因于微盘内竞争的自由载流子和声子群体之间的非线性相互作用。
