Title: Controlling Multimode Optomechanical Interactions via Interference,
Abstract: We demonstrate optomechanical interference in a multimode system, in which an
optical mode couples to two mechanical modes. A phase-dependent
excitation-coupling approach is developed, which enables the observation of
constructive and destructive optomechanical interferences. The destructive
interference prevents the coupling of the mechanical system to the optical
mode, suppressing optically-induced mechanical damping. These studies establish
optomechanical interference as an essential tool for controlling the
interactions between light and mechanical oscillators.