On-chip mechanical exceptional points based on an optomechanical zipper cavity.

The article discuses the physics related to on-chip mechanical exceptional points (EPs) with a silicon optomechanical zipper cavity and their possible applications for ultrasensitive measurements. It is reported that exceptional points are special degenerate points of spectra that exist in the non Hermitian system. It is further reported that optical EPs has been demonstrated in various platforms including optical & microwave cavities, photonic crystal slabs & multilayered plasmonic structures.