A self-stabilized coherent phonon source driven by optical forces.
A self-stabilized coherent phonon source driven by optical forces.
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DOI：
10.1038/srep15733
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发表时间：
2015-10-27
影响因子：
4.6
通讯作者：
Sotomayor Torres CM
中科院分区：
文献类型：
--
作者：
Navarro-Urrios D;Capuj NE;Gomis-Bresco J;Alzina F;Pitanti A;Griol A;Martínez A;Sotomayor Torres CM
我们报道了一种新的注入方案，它允许在一维光-机械光子晶体中进行“声子激光”，在边带未分辨的区域，协作性值低至10−2。它从连续红外激光源中提取能量，并基于触发热光/自由载流子色散自脉冲极限环，该极限环对辐射压力作非简谐调制。相干机械运动的大幅度起到反馈的作用，将自脉冲振荡稳定并引入到机械频率的简单分数。由于自脉冲固有频率的宽可调性，观察到具有两种不同机械模式(54和122MHZ)的多个频率携带区。该系统在硅平台的压力和温度环境条件下运行，这使得它能够在传感、芯片内计量或计时应用中得到开发。
We report a novel injection scheme that allows for “phonon lasing” in a one-dimensional opto-mechanical photonic crystal, in a sideband unresolved regime and with cooperativity values as low as 10−2. It extracts energy from a cw infrared laser source and is based on the triggering of a thermo-optical/free-carrier-dispersion self-pulsing limit-cycle, which anharmonically modulates the radiation pressure force. The large amplitude of the coherent mechanical motion acts as a feedback that stabilizes and entrains the self-pulsing oscillations to simple fractions of the mechanical frequency. A manifold of frequency-entrained regions with two different mechanical modes (at 54 and 122 MHz) are observed as a result of the wide tuneability of the natural frequency of the self-pulsing. The system operates at ambient conditions of pressure and temperature in a silicon platform, which enables its exploitation in sensing, intra-chip metrology or time-keeping applications.