Real-time electrical tuning of an optical spring on a monolithically integrated ultrahigh Q lithium nibote microresonator

Cavity optomechanics, the study of the interplay between light and mechanical properties of matter, has triggered a wide range of research from cavity quantum electrodynamics, label-free single molecule detection to the creation of phonon lasers. Using femtosecond laser direct writing followed by chemo-mechanical polishing, here we report an ultrahigh quality (Q similar to 10(7)) factor lithium niobate whispering gallery microresonator monolithically integrated with inplane microelectrodes. Coherent regenerative optomechanical oscillation with an effective mechanical quality factor as high as 2.86 x 10(8) is observed in air. We demonstrate real-time electrical tuning of the optomechanical frequency with an electromechanical tuning efficiency around - 134 kHz/100 V. (c) 2019 Optical Society of America