(a) Schematic illustration of the mechanical modes of the cantilever-microsphere structure, the tapered fiber injecting a temporally-modulated laser beam into the WGM, and an acoustic source. (b) Oscillation spectrum of different mechanical modes from the tapered fiber “string”: each mode has been verified by FEM. (c) Demonstration of the dual channel communications. Each row represents a combination of waves acting on the system (the magenta color represents the generating frequency). OM: optical modulation. AM: acoustic modulation. From [74].