We report the development of an all-optical approach that excites the fundamental compression mode in a diamond Lamb wave resonator with an optical gradient force and detects the induced vibrations via strain coupling to a silicon vacancy center, specifically, via phonon sidebands in the optical excitation spectrum of the silicon vacancy. Sideband optical interferometry has also been used for the detection of the in-plane mechanical vibrations, for which conventional optical interferometry is not effective. These experiments demonstrate a GHz fundamental compression mode with a Q-factor >10^7 at temperatures near 7 K, providing a promising platform for reaching the quantum regime of spin mechanics, especially phononic cavity QED of electron spins.
@article{arxiv.2408.13405,
title = {Ultracoherent GHz Diamond Spin-Mechanical Lamb Wave Resonators},
author = {Xinzhu Li and Ignas Lekavicius and Jens Noeckel and Hailin Wang},
journal= {arXiv preprint arXiv:2408.13405},
year = {2024}
}