Fig. 2: 2D IR spectroscopy of cavity-coupled SNP.
From: Excited-state vibration-polariton transitions and dynamics in nitroprusside

Two-dimensional infrared spectra of the NO stretching band strongly coupled to an optical mode of a 25 μm-long Fabry–Pérot cavity measured at a 1 ps, b 10 ps, and c 50 ps waiting times. The intensity scale is in units of normalized −log(T/T0), with blue positive (decreased transmission) and red negative (increased transmission). Solid colored lines represent the pump frequencies used for the spectral cuts in panels d, e, and f. The blue trace is taken where the pump frequency coincides with the UP, the black trace corresponds to the reservoir, and the red trace corresponds to the LP. In addition, f shows the normalized reservoir slice (solid black trace) and the unnormalized reservoir slice (dashed black trace). The Rabi splitting in this data is 35 cm−1.