A microscopic model for optomechanics

Seminar

Speaker: Kanupriya Sinha
When: Aug. 31 2015 14:00
Where: Erwin Schrödinger Saal.

We discuss a microscopic model for describing optomechanical interactions, which incorporates the dynamics of the charge-like internal degrees of freedom of a mirror that couple to the optical field. Considering the mirror to be a composite of two separate degrees of freedom that pertain to its internal dynamics and mechanical motion we derive the optomechanical properties of the coupled mirror and field system. The major advantage in this approach is that it provides a self-consistent treatment of the three relevant subsystems (the mirror's motion, its internal degrees of freedom and the field) including their backactions on each other, thereby giving a more accurate account of the coupled internal and external dynamics. The optical and the mechanical properties of a mirror arising from its dynamical interaction with the field are obtained without imposing any boundary conditions on the field additionally, as is done in the conventional way. We find that our results agrees with those from the boundary condition approach in the appropriate limits and more generally the model provides a framework within which one can study optomechanical elements belonging to a broad range of parameter regimes. Further, considering the quantum entanglement between the mirror's center of mass motion and the field we find that the internal degree can act as a means to coherently transfer quantum correlations between the field and the mechanics.

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