Figure 2: Experimental setup and experimental modal spectroscopy.
From: Stimulated optomechanical excitation of surface acoustic waves in a microdevice
(a) The pump laser is coupled to the optical microsphere resonator through a tapered fibre. Forward-scattered optical signals and the pump transmission are subject to both optical and electrical spectrum analysis. The experimental data insets show an example 134 MHz mechanical mode observed in electrical domain with an unchanging pump laser. (b) Many mechanical modes are observed when the pump laser is scanned slowly from 1,520–1,570 nm. We depict the best-match Rayleigh surface modes for several of the measured frequencies. Colours represent the deformation of the mechanical mode.
