Real-time Electrical Tuning of an Optical Spring on a Monolithically Integrated Ultrahigh Q Lithium Nibote Microresonator

TL;DR

This paper demonstrates a monolithically integrated lithium niobate microresonator with ultrahigh Q factor, enabling real-time electrical tuning of optomechanical oscillations with high efficiency, advancing integrated optomechanics.

Contribution

It introduces a novel lithium niobate microresonator with ultrahigh Q and integrated microelectrodes for real-time electrical tuning of optomechanical frequencies.

Findings

Achieved an ultrahigh Q factor of ~10^7 in lithium niobate microresonator.

Observed coherent regenerative optomechanical oscillation with Qm up to 2.86*10^8.

Demonstrated electrical tuning of optomechanical frequency at -134 kHz/100V.

Abstract

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