Fig. 3: Vibrational-plasmon coupling. | Light: Science & Applications

Fig. 3: Vibrational-plasmon coupling.

From: Giant mid-IR resonant coupling to molecular vibrations in sub-nm gaps of plasmonic multilayer metafilms

Fig. 3

a Fano lineshape of CB[5] vibration in coupled oscillator model fit (‘model’, black line, SI Section S3) to the measured reflectance spectrum (‘expt’, blue line) of NP7ML-on-mirror films. b Extracted coupled plasmon-vibrational modes show an anticrossing with coupling strength g ~ 100 cm−1. c Extinction for detunings around resonance, showing phase change of Fano dip. d Fano dip strength RFano of the SEIRA molecular absorption at 1765 cm−1 and e molecular Lamb shift \(\delta \omega _{{{\mathrm{L}}}}\) vs plasmon-molecular vibration detuning Δ = ωBPP − ωm between molecular (ωm) and plasmon (ωBPP) resonances (lines are guides to eye)

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