Fig. 6: VSC strength as a function of molecule quantity in the photonic cavity.
From: Trapping light in air with membrane metasurfaces for vibrational strong coupling
a Spectral response of VSC between the qBIC TM mode and PMMA C = O vibrational band (shaded gray) as the PMMA thickness filling the cavity increases. The bare metasurface resonance is also shown in black. Vertical offsets were applied to improve clarity. b Experimentally measured (yellow dots) and analytical fit \(\propto \sqrt{t}\) of Rabi splitting values as a function of PMMA thickness t. The Rabi splitting increases as the coupling strength is enhanced with a growing number of PMMA molecules that interact with the cavity. c Field decay profile of the qBIC TM mode on top of the membrane as a function of distance along the z-axis going away from the surface.
