Surface Optomechanics: Analytic Solution of Detection Limits of Surface Acoustic Waves in Various Fluids

Here we derive the absolute detection limits of various families of surface acoustic waves (SAW) resulting from Brillouin scattering in a whispering gallery resonator (WGR). Given this limit, we calculate the absolute concentration limits for detection of pollutant chemicals in air, water, or other fluids surrounding the WGR. General equations for SAW velocity, linewidth, and detectability are given

Surface Optomechanics: Forward and Backward Scattered Surface Acoustic Waves in Silica Microsphere

Here we provide the theoretical background, calculate expected results, and experimentally show optically-induced Surface Acoustic Waves (SAW) of three distinct families of material deformation on silica microsphere whispering gallery resonators (WGR). These families of SAW are predicted and observed in both the forward- and backward-scattered directions of travel relative to the inducing optical field. Photonic cooling of materials at room temperature is discussed and preliminary observations are presented

Surface Optomechanics: Calculation of Love Surface Acoustic Waves on Microresonators

We calculate optomechanically excited Love waves on the surface of a silica whispering-gallery microresonator surrounded by air and pollutants. We show a method for sensing and distinguishing type or concentration of pollutant via frequency shift