Sensitive control of mechanical motion at the mesoscopic scale underlies a variety of applications ranging from bio-sensing to signal processing, which has been seen in various micro-/nano-electromechanical devices. Interestingly, mechanical motion can be efficiently manipulated by radiation pressure at the nanoscopic scale, particularly in high-Q micro-/nano-cavities where the photon-phonon interaction can be dramatically enhanced. The resulting strong optomechanical coupling exhibits exceptional capability of motion control down to single quantum level. On one hand, such intriguing capability enables manipulating the photonic and phononic quantum states, thus allowing for the exploration of novel photon-phonon interaction dynamics. On the other hand, it offers a great opportunity for a variety of applications related to sensing and photonic signal processing with unprecedented performance.
We are currently actively engaged in developing various sensing applications using the optomechanical principle. We discovered a novel approach for ultrasensitive particle and molecule sensing, based upon the optical spring effect. We developed novel approaches for inertial sensing based upon the optomechanical principle. We developed coherent nano-optomechanical oscillators operating in atmospheric and aqueous environments.