Abstract
We present a computational study of the near-field enhancement properties from a plasmonic nanomaterial based on a silver nanoparticle on a gold film. Our simulation studies show a clear distinguishability between nanoparticle mode and gap mode as a function of dielectric layer thickness. The observed nanoparticle mode is independent of dielectric layer thickness, and hence its related plasmonic properties can be investigated clearly by having a minimum of ~10-nm-thick dielectric layer on a metallic film. In case of the gap mode, the presence of minimal dielectric layer thickness is crucial (~≤4 nm), as deterioration starts rapidly thereafter. The proposed simple tunable gap-based particle on film design might open interesting studies in the field of plasmonics, extreme light confinement, sensing, and source enhancement of an emitter.
Highlights
Structures in nanoscale geometries display new properties which differ entirely from bulk behavior [1,2]
Please note that a dielectric layer thickness ~
Our threedimensional finite difference time domain simulation studies showed the influence of dielectric layer thickness when coming towards the significant distinguishability between nanoparticle and gap modes
Summary
Structures in nanoscale geometries display new properties which differ entirely from bulk behavior [1,2]. Such carrier confinement leads to high enhancement of the local field and allows manipulation of light below the diffraction limit These significant features of SPR allow plasmonic materials to generate potential applications in a variety of fields such as photonics, energy, life sciences, optics, spectroscopy, sensors, and chemistry [11–18]. When plasmonic nanostructures are separated by a smaller distance in nanoscale, the nanogap effect happens in a nonradiative near-field region where SPR couples electromagnetically This results in studying interesting plasmonic properties such as a shift in plasmonic resonances, hybrid plasmon modes, sizeable local-field enhancement (hot-spot generation), etc. The near-field enhancement originating from smaller sub-nanometer gap spacing in a metallic nanostructure can be significantly higher than of an individual nanoparticle structure This property can be employed in optical sensing applications like surface-enhanced Raman spectroscopy (SERs), plasmon-enhanced photoemission, and plasmon mediated photocatalysis [8,12,23,25,31,49]. Such studies are essential when dealing with optical sensing and other near-field related applications
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