Two-dimensional Infrared Spectroscopy of vibrational polaritons of   molecules in an optical cavity
  Strong coupling of molecular vibrations to an infrared cavity mode affects their nature by creating dressed polariton states. We show how the single and double vibrational polariton manifolds may be controlled by varying the cavity coupling strength, and probed by a time domain 2DIR technique, Double Quantum Coherence (DQC). Applications are made to the amide-I ($CO$) and amide-II ($CN$) bond vibrations of $N-methylacetamide$ (NMA). 
Prasoon Saurabh and Shaul Mukamel
quant-ph cond-mat.mes-hall physics.optics