title: Reactive cavity optical force on microdisk-coupled nanomechanical beam waveguides.
abstract: We demonstrate spectrally tuned dispersive and reactive optical force in a cavity optomechanics system that comprises a microdisk and a vibrating nanomechanical beam waveguide. The waveguide coupled to the microdisk acts as a bosonic dissipation channel and its motion modulates the cavity's damping rate. As a result a reactive optical force arises in addition to the normal dispersive force. The cavity enhanced force is not observed at zero detuning but shows asymmetric behavior with a maximum at red-detuned offset. Such reactive cavity backaction force points to new avenues in cavity optomechanics.
authors.affiliation: Department of Electrical Engineering, Yale University, 15 Prospect Street, New Haven Connecticut 06520, USA.
authors.forename: Mo
authors.initials: M
authors.lastname: Li
authors.forename: Wolfram H P
authors.initials: WH
authors.lastname: Pernice
authors.forename: Hong X
authors.initials: HX
authors.lastname: Tang