Theoretical study of enhanced Kerr nonlinearity in nanohybrid structures resulting from interactions between plasmonic modes and excitonic transitions

Nanohybrid structures, consisting of metallic nanoparticles (MNPs) and semiconductor quantum dots (SQDs), display distinct optical characteristics resulting from the interplay between the plasmonic modes of MNPs and the excitonic transitions in SQDs. These interactions improve the interaction between light and matter, resulting in new visual phenomena and adjustable electromagnetic reactions. This study examines the nonlinear optical effects in these nanohybrids, including the creation of plexcitons and their enhanced nonlinear reactions, including rapid all-optical switching and frequency conversion. The study of Kerr nonlinearity involves using precise mathematical formulations and numerical simulations to investigate the interactions that occur. The interaction between plasmonic and excitonic modes greatly amplifies the Kerr effect, caused by the increased electric field at the interfaces of metal nanoparticles and semiconductor quantum dots. This theoretical study offers a thorough examination of the interactions between quantum dots, nanoparticles, and nanoparticle-semiconductor quantum dot hybrids. It specifically investigates the consequences of nonlocality resulting from the finite sizes of nanoparticles. As a result, this paper presents a comprehensive model, in which we expect the results to have the highest consistency with experimental findings. Gaining a comprehensive understanding of these non-linear interactions has the potential to drive progress in nanophotonic systems and facilitate the creation of groundbreaking photonic and optoelectronic applications.