Numerical investigations on a photonic nanojet coupled plasmonic system for photonic applications

A photonic nanojet (PNJ) from a microcavity is a narrow and intense beam of light used to enhance the emerging electric field. Metal nanoparticles (NPs), on the other hand, confine a strong field in their vicinity due to the resonance of the free electrons with the incident field. A hybrid combination of a microcavity with a NP can drastically enhance the output field. In this work, a systematic numerical study of the microcavity-NP system has been carried out to investigate the effect of the shape of the metal NPs on the output field strength. The single and their dimer NPs with different dimer nanogaps with PNJ producing microcavity have been investigated. Splitting of the broad dipole mode of the NP has also been observed. As an application of this study, the surface enhanced Raman spectroscopy factor of the order of 10(7) has been estimated for nano-cube dimer NP-microcavity hybrid system.

Automated summary

This study conducted a numerical investigation on the microcavity-NP system and found that the shape of metal nanoparticles has a significant impact on the output field strength. The splitting of the dipole mode of the nanoparticles was also observed, and the surface enhanced Raman spectroscopy factor was estimated for the nano-cube dimer NP-microcavity hybrid system.