|Title||Spin-optomechanical coupling between light and a nanofiber torsional mode|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||E. F. Fenton, A. Khan, P. Solano, L. A. Orozco, and F. K. Fatemi|
|Keywords||Fiber optics, Heterodyne, Nanophotonics and photonic crystals, Optomechanics|
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&\#x2248;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&\#x2009;&\#x2009;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.