Fenton Eliot F, Khan Adnan, Solano Pablo, Orozco Luis A, Fatemi Fredrik K
Opt Lett. 2018 Apr 1;43(7):1534-1537. doi: 10.1364/OL.43.001534.
Light that carries linear or angular momentum can interact with a mechanical object, giving rise to optomechanical effects. In particular, a photon can transfer its intrinsic angular momentum to an object when the object either absorbs the photon or changes the photon polarization, as in an action/reaction force pair. Here, we demonstrate resonant driving of torsional mechanical modes of a single-mode tapered optical nanofiber using spin angular momentum. The nanofiber torsional mode spectrum is characterized by polarimetry, showing narrow natural resonances (Q≈2,000). By sending amplitude-modulated light through the nanofiber, we resonantly drive individual torsional modes as a function of the light polarization. By varying the input polarization to the fiber, we find the largest amplification of a mechanical oscillation (>35 dB) is observed when driving the system with light containing longitudinal spin on the nanofiber waist. These results present optical nanofibers as a platform suitable for quantum spin-optomechanics experiments.
携带线性或角动量的光可以与机械物体相互作用，从而产生光机械效应。特别是，当物体吸收光子或改变光子偏振时，光子可以将其固有角动量传递给物体，就像在作用力/反作用力对中一样。在这里，我们展示了利用自旋角动量对单模锥形光学纳米纤维的扭转机械模式进行共振驱动。纳米纤维扭转模式光谱通过偏振测量来表征，显示出狭窄的自然共振（Q≈2000）。通过将振幅调制光发送通过纳米纤维，我们根据光的偏振共振驱动各个扭转模式。通过改变输入到纤维的偏振，我们发现当用在纳米纤维腰部包含纵向自旋的光驱动系统时，观察到机械振荡的最大放大（>35 dB）。这些结果表明光学纳米纤维是适合量子自旋光机械实验的平台。
