  We demonstrate optically coupled nanomechanical resonators fabricated on
silicon-on-insulator. Silicon fin waveguides are used to control the dispersion
of mechanical waves and engineer localized resonances by modulation of the fin
properties. A photonic crystal cavity is designed to localize laser light near
the fin and the mechanical motion is read out and modified by radiation
pressure back-action. We expect devices and systems made from similar
structures to enable co-integration of signal transduction and processing
capabilities via electronic, photonic, and phononic degrees freedom in a single
scalable platform.
