Frequency shifting in artificial Kerr media composed of compressible microparticles

We examine a novel approach for achieving frequency conversion of electromagnetic waves utilizing the dynamic compressibility of a suspension of microparticles that are driven by an acoustic wave. In particular, for resonantly driven gas bubbles in liquid, we find for small filling factors f that the acousto-optic dielectric constant is (epsilon(1)/epsilon(0)) approximately fQ(p/p(0)), where Q is the quality factor for the oscillating bubble, p is the acoustic-wave pressure, and p(0) is the ambient pressure.