Fig. 3: Measurements of the fabricated samples.
From: Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions
a, b Measured reflection (a) and absorption (b) spectra of an empty Lcav = 400 nm cavity, bare Lrod = 300 nm long plasmonic nanorods, and those of the coupled system with the electric field polarization parallel to the major rod axis. c Measured dispersion of the reflection spectra of the coupled plasmon–cavity system with Lrod = 300 nm plasmonic nanorods as a function of the cavity thickness revealing an anti-crossing between the two polaritonic modes. Dashed lines show the positions of the bare plasmon array mode and the bare Fabry–Pérot modes of the 1st and 2nd order. ΩR denotes the minimal observed splitting between the two polaritonic modes.
