Strong Coupling of Nanoplatelets and Surface Plasmons on a Gold Surface

Abstract

Nanoplatelets are strongly anisotropic colloidal nanocrystals confined in only one direction. Perfect thickness control and large lateral dimensions enable a large exciton coherence area that exhibits a high oscillator strength. Here we investigate experimentally the existence of a strong plasmon−exciton coupling regime in a system consisting of a layer of nanoplatelets on top of a gold planar surface. We performed reflectivity measurements to extract geometrical and optical parameters of the system, and we used them to calculate numerically the modes and obtain the dispersion relation of the structure. Our results show a clear Rabi splitting between an upper and a lower polariton branch, thus demonstrating unambiguously that the system is in the strong coupling regime.

Real-space observation of vibrational strong coupling between propagating phonon polaritons and organic molecules

“…2e,h) describes well the experimental data 𝑠3(q,w) (Fig. 2d,g), particularly peak positions, linewidths and the saddle point at the CBP resonance, demonstrating that spatially Fourier transformed spectral polariton interferometry can be interpreted analogously to momentum-and frequencyresolved surface plasmon resonance spectroscopy employing, for example, the classical Kretschmann-Raether configuration 27,[29][30][31][32] .…”

Molecular Polaritons Generated from Strong Coupling between CdSe Nanoplatelets and a Dielectric Optical Cavity

“…The exceptionally narrow absorption and fluorescence line widths of NPLs (compared to their spherical cousins colloidal quantum dots) and their exceptionally large oscillator strengths make these semiconducting NPLs promising candidates for achieving a strong light–matter coupling. Indeed NPLs have recently been incorporated into resonant photonic structures. ,, Challenges for integrating colloidal NPLs into optical cavities include complex sample preparation or the use of plasmonic structures with a relatively low Q -factor. , Importantly, the fundamental photophysical properties of the polariton states in the NPL–cavity hybrid system have not been carefully investigated.…”

Microcavity phonon polaritons from weak to ultrastrong phonon-photon coupling

“…We note that the spectral position of reflection minima and the actual polaritonic modes of a system can be different due to the interference of spectrally closely spaced modes (particularly in weakly coupled systems [36,37]). For that reason, we determine the eigenfrequencies of the modes (ω (j) + and ω (j) − for the filled cavity, and ω (j) cav for the bare cavity), which correspond to the poles of the reflection coefficient obtained from the TM calculation [38] (dashed lines in Fig. 3a and b, for details see Supplementary Information S2.1 and S2.2).…”