Theory of Optomechanical Interactions in Superfluid He
arXiv:1406.2248 · doi:10.1103/PhysRevA.90.023812
Abstract
A general theory is presented to describe optomechanical interactions of acoustic phonons, having extremely long lifetimes in superfluid He, with optical photons in the medium placed in a suitable electromagnetic cavity. The acoustic nonlinearity in the fluid motion is included to consider processes beyond the usual linear process involving absorption or emission of one phonon at a time. We first apply our formulation to the simplest one-phonon process involving the usual resonant anti-Stokes upconversion of an incident optical mode. However, when the allowed optical cavity modes are such that there is no single-phonon mode in the superfluid which can give rise to a resonant allowed anti-Stokes mode, we must consider the possibility of two phonon upconversion. For such a case, we show that the two step two phonon process could be dominant. We present arguments for large two step process and negligible single step two phonon contribution. The two step process also shows interesting quantum interference among different transition pathways.
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