Generating Coherent Raman Scattering Using a Molecular Optomechanical Cavity

Coherent Raman scattering, e.g., coherent anti-Stokes
Raman scattering
(CARS) and stimulated Raman scattering (SRS), has emerged as a powerful
tool for label-free molecular imaging in biological and biomedical
systems. Here we develop an optomechanical approach for coherent Raman
spectroscopy with a focus on the CARS and SRS. The results show that
the Raman cross section can be significantly enhanced by increasing
the pump strength. It turns out that the CARS signal is robust to
the external temperature, yielding an order of magnitude amplification
due to √N collectivity. We further find that
the power spectrum of the emission is dominated by the SRS process.
The SRS signal presents an anti-Stokes component appreciably stronger
than the Stokes one. Our work suggests a new scheme for generating
coherent Raman signals with enhanced stability and signal-to-noise
ratio, which would be beneficial for molecular spectroscopy.