Effect of ultrathin layer of MoS2 on resonance mode coupling and hybridization of AlGaAs nanoscale Mie-resonator: a simulation study

Abstract

Abstract light–matter interactions, specifically the interaction between Mie resonance modes originated from all-dielectric nano-resonators and exciton modes from the semiconducting transition metal di-chalcogenides (TMDCs) recently become an important field of study due to its application in nanophotonic devices and quantum information processing. Here, we performed finite element method (FEM) based numerical simulations on isolated Al x Ga(1-x)As (x: alloy composition) core - MoS2 ultrathin nanoshell, to study the interaction between Optical Mie resonance modes and exciton modes. The interaction between magnetic dipole (MD) modes originated from the Mie-active dielectric core and excitonic response from the thin semiconductor nano-shell takes place and appears as resonance mode coupling and hybridization in the scattering efficiency spectra. The resultant spectrum was elucidated using a semi-classical coupled mode theoretical model (CMT) and the coupling constant value was estimated, followed by the evaluation of anti-crossing spectral behavior and Rabi splitting. Furthermore, we found that all the properties of the spectrum or the resonance coupling are sensitive to the core radius, alloy composition of the core, shell thickness, and the refractive index of the surrounding medium. By systematically tailoring these parameters, one can tune the quenching dip or line width of the resonance modes. The insights from these simulations not only provided the basis for fundamental research on strong nanoscale light–matter interaction but will also be quite beneficial in fabricating high-efficiency optoelectronic and smart nanophotonic devices related to photon-exciton interactions.