Plasmon-Enhanced anti-Stokes Raman Scattering Based on Local Density of States Engineering.

The optical Raman cooling implies enhanced anti-Stokes scattering compared to Stokes scattering. Plasmon-enhanced Raman scattering in a layered insulator-metal-insulator (IMI) system occurs due to the modification of the local density of electromagnetic states (LDOS) near a metallic layer. Because both eigenmodes with frequencies below the plasma frequency are surface modes and the high-frequency mode is delocalized, energy is capable of dissipating into free space through anti-Stokes scattering. In this work, we carry out the numerical simulation of LDOS for IMI structures with a varied thickness of the metallic layer. Our work is a step towards the development of structured photonic materials for optical cooling of solids. [ABSTRACT FROM AUTHOR]