Enhancement of the Raman Effect by Infrared Pumping

Abstract

We propose a method for increasing the Raman scattering from an ensemble of molecules by up to four orders of magnitude. Our method requires an additional coherent source of IR radiation with the half-frequency of the Stokes shift. This radiation excites the molecule electronic subsystem that in turn, via Fröhlich coupling, parametrically excites nuclear oscillations at a resonant frequency. This motion is coherent and leads to a boost of the Raman signal in comparison to the spontaneous signal because its intensity is proportional to the squared number of molecules in the illuminated volume.

References in corpus (2)

• The Raman Fingerprint of Graphene
• Vibrational Excitations in Weakly Coupled Single-Molecule Junctions: A Computational Analysis

Cited by in corpus (5)

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• Heralded single-photon source based on ensemble of Raman active molecules