Optomechanical crystal cavities are artificially engineered nanoscale devices designed to enhance the interaction between confined light and mechanical motion. Their ability to simultaneously localize optical and mechanical modes makes them promising platforms for studying cavity optomechanics and related applications. This webinar demonstrates how COMSOL Multiphysics® can be used to model an optomechanical crystal cavity and quantify the interaction between its optical and mechanical resonances. First, the photonic and the phononic band structures of a periodic optomechanical crystal are calculated using the optical and the structural mechanics simulations. Then, a gradual tapering is introduced in the crystal to form a cavity that supports spatially co-localized optical and mechanical resonant modes.

The optical and the mechanical simulations are combined to evaluate the optomechanical coupling rate, including contributions arising from the interaction between mechanical deformation and the confined electromagnetic field. This presentation highlights how Multiphysics modeling can provide valuable insight into the interaction between light and mechanical motion, opening new opportunities for the design and development of optomechanical devices across both academic research and industrial applications.