Tunable Resonance Coupling in Single Si Nanoparticle–Monolayer WS₂ Structures

Abstract

Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) are extremely attractive materials for optoelectronic applications in the visible and near-infrared range. Coupling these materials to optical nanocavities enables advanced quantum optics and nanophotonic devices. Here, we address the issue of resonance coupling in hybrid exciton-polariton structures based on single Si nanoparticles (NPs) coupled to monolayer (1L)-WS. We predict a strong coupling regime with a Rabi splitting energy exceeding 110 meV for a Si NP covered by 1L-WS at the magnetic optical Mie resonance because of the symmetry of the mode. Further, we achieve a large enhancement in the Rabi splitting energy up to 208 meV by changing the surrounding dielectric material from air to water. The prediction is based on the experimental estimation of TMDC dipole moment variation obtained from the measured photoluminescence spectra of 1L-WS in different solvents. An ability of such a system to tune the resonance coupling is realized experimentally for optically resonant spherical Si NPs placed on 1L-WS. The Rabi splitting energy obtained for this scenario increases from 49.6 to 86.6 meV after replacing air by water. Our findings pave the way to develop high-efficiency optoelectronic, nanophotonic, and quantum optical devices.

Transition metal dichalcogenide nanodisks as high-index dielectric Mie nanoresonators

“…These hybrid states have attracted considerable attention recently as they are of interest for quantum and nonlinear optics applications, as well as for modification of photochemical reactions [46][47][48][49] . Mie resonances of Si and perovskite nanostructures, as well as WS 2 nanotubes, were recently shown to hybridize within various excitonic systems [50][51][52][53][54] . Here we observe hybridization of anapoles and excitons within a single WS 2 nanodisk.…”

Magnetic and electric Mie-exciton polaritons in silicon nanodisks

“…On the other hand, fewer degrees of freedom can be offered by two-dimensional materials, whose homogeneity and in-plane dipole orientation might result in a simpler system to be studied. [43,54] III. CONCLUSIONS…”

Enhanced excitation and emission from 2D transition metal dichalcogenides with all-dielectric nanoantennas

“…In particular, we consider c-Si for the particle material, because of its large refractive index in the visible range and moderate losses [30]. SiNPs of spherical shape can be fabricated chemically [33] or with fs-laser ablation [34]. In [33], [32], it has been shown that spherical SiNPs and Si nanowires can be placed on 2D TMDCs (WS2 and MoS2, respectively) without damaging their crystalline structure, where an additional thin layer of h-BN can be used for protection or isolation of 2D TNDCs [35].…”