Calculating Opto-Mechanically Induced Surface Acoustic Waves in a Silica Whispering Gallery Microresonator
Abstract
Here we calculate using COMSOL opto-mechanically induced Surface Acoustic Waves upon a silica microresonator. Using conservation of momentum, we show both analytically and numerically that the photon-phonon interaction within the resonator cavity causes a moving train of electrodes - a virtual grating of matter density that displace material in different directions and magnitudes. This hyper-acoustic mode leads to the formation of a high-order Stokes optical line where the sum of the momentum between the Stokes line and the Surface Acoustic Wave is equal to that of the pump optical mode. We calculate three distinct families of SAW longitudinal, transverse, and Rayleigh-type, and leave open the possibility of sub-families or other deformation types, such as Love waves. Finally, we perform spectroscopy on these SAW and find that high-order modes exist, we calculate their structure, and find that their velocities match the analytically predicted bulk rate within 1% at high-order SAW modes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2011
- Accession Number
- ADA579591
Entities
People
- John Zehnpfennig
Organizations
- United States Military Academy