Cavity QED enhanced Raman scattering in microdroplets

A. J. Campillo, Jay D. Eversole, H.‐B. Lin

Hsing‐An Lin, Jay D. Eversole, A. J. Campillo

Continuous-wave stimulated Raman scattering was observed in 11-13-microm-diameter benzene and toluene microdroplets at pump intensities as low as 8 and 24 kW/cm(2), respectively. Low thresholds were achieved by exploiting simultaneous pump and Stokes wave resonance in the droplets and Raman gains that were cavity QED enhanced ~50 times with respect to bulk liquid values. Based on a photon-state conservation argument, the cavity gain enhancement factor may be approximated by the ratio of the spectral spacing between resonant modes of the same order to that of the homogeneous Raman linewidth. This relation appears to be consistent with the relative experimental behavior of benzene, ethanol, and toluene.

Alan L. Huston, H. B. Lin, Jay D. Eversole +1 more

A. J. Campillo, Jay D. Eversole, Horn-Bond Lin

Several cavity quantum electrodynamic phenomena have been observed in liquid microdroplets. These include cavity-induced spectral changes, emission lifetime modification, and enhanced lasing and Raman gains.

Vincenzo Macrí, Alberto Mercurio, Franco Nori +2 more

We show that spontaneous Raman scattering of incident radiation can be observed in cavity-QED systems without external enhancement or coupling to any vibrational degree of freedom. Raman scattering processes can be evidenced as resonances in the emission spectrum, which become clearly visible as the cavity-QED system approaches the ultrastrong coupling regime. We provide a quantum mechanical description of the effect, and show that ultrastrong light-matter coupling is a necessary condition for the observation of Raman scattering. This effect, and its strong sensitivity to the system parameters, opens new avenues for the characterization of cavity QED setups and the generation of quantum states of light

Rayssa Bruzaca de Andrade, Tobias Gehring, Ulrik L. Andersen