Control of Photon Flow with Mechanical Motion

Monday, April 11, 2016 - 3:30pm - 4:30pm
Keller 3-180
Mo Li (University of Minnesota, Twin Cities)
Optomechanics utilizes the forces of light to induce mechanical motion of the devices, which in turn affect the flow of light. More interestingly, in optical cavity, the interaction between the mechanics (the phonon) and the light (the photons) forms a feedback loop and thus can be viewed as a control problem. In this talk, I will discuss a unique torsional optomechanical system our group has developed. We show the rotational motion induced by light drives photon tunneling between two weakly coupled cavities. Using the high sensitivity afforded by this device, we demonstrate measurement of optical torque and photon spin angular momentum. Finally, I will discuss control photon flow with GHz acoustic waves.