Strong coupling between organic dye molecules and lattice modes of a dielectric nanoparticle array

Abstract

Plasmonic structures interacting with light provide electromagnetic resonances which result in a high degree of local field confinement enabling the enhancement of light-matter interaction. Plasmonic structures typically consist of metals which, however, suffer from very high ohmic losses and heating. High-index dielectrics, on the other hand, can serve as an alternative material due to their low-dissipative nature and strong scattering abilities. We study the optical properties of a system composed of all-dielectric nanoparticle arrays covered with a film of organic dye molecules (IR-792), and compare these dielectric arrays with metallic nanoparticle arrays. We tune the light-matter interaction by changing the concentration in the dye film and report the system to be in the strong coupling regime. We observe a Rabi splitting between the surface lattice resonances (SLRs) of the nanoparticle arrays and the absorption line of the dye molecules of up to 253 meV and 293 meV, for the dielectric and metallic nanoparticles, respectively. The Rabi splitting depends linearly on the square root of the dye molecule concentration , and we further assess how the Rabi splitting depends on the film thickness for a low dye molecule concentration. For thinner films of thicknesses up to 260 nm, we observe no visible Rabi splitting. However, a Rabi splitting evolves at thicknesses from 540 nm to 990 nm. We perform finite-difference time-domain simulations to analyze the near-field enhancements for the dielectric and metallic nanoparticle arrays. The electric fields are enhanced by a factor of 1200 and 400, close to the particles for gold and amorphous silicon, respectively, and the modes extend over half a micron around the particles for both materials.

Polarization and phase textures in lattice plasmon condensates

“…For our proof-of-concept demonstration of polarization textures, we used a C 2 symmetric (x − y symmetric) system. Future design possibilities include lattices with different geometry, size, and structure of the unit cell to realize new combinations of broken or competing symmetries, artificial gauge fields, and pseudospin-orbit coupling; different material choices such as dielectrics are also feasible (32)(33)(34). Importantly, the simple theoretical framework introduced here allows fast and intuitive planning of the desired textures.…”

Strong light-matter coupling in dielectric metasurfaces

“…Achieving the strong coupling regime with Mie resonances has remained challenging due to their moderate field enhancements and large radiative losses. [1,2] Strong coupling results in the hybridization of light and matter into quasiparticles known as excitonpolaritons, with remarkable properties such as enhanced transport, long-range energy transfer, condensation, and non-linear response.…”

Manipulating the photonic Hall effect with hybrid Mie-exciton resonances

“…Such architectures offer even broader functionality and flexibility in applications, while also providing crucial new insight into the nature and mechanisms governing light-matter interactions. Recently, silicon-J -aggregate heterostructures have been explored, from both theoretical and experimental aspects, as an alternative to plasmon-exciton hybrids termed plexcitons [7,25], revealing the formation of hybrid modes of photonicexcitonic character, termed, in an equivalent manner, Mie-excitons [15,[26][27][28][29]. In particular, since their emergence in literature, it has been envisaged that the complex, magnetic nature of their modes, would eventually allow to externally manipulate them with static magnetic fields [26] in analogy with active magnetoplasmonics [30], a feature that has not, however, been explored as yet.…”