Gap size impact on metal-dielectric nanocavity heater properties

摘要

Metal-dielectric nanocavitiy is an effective tool for light manipulation and strong localization of the electric field at nanoscale. This system provides the ability to control both: field enhancement factor and temperature and can be utilized in biological applications for SERS and harmonic generation. In turn, some applications require high field intensities, but overheating may either affect on the resulting properties or damage biological sample. Here, we numerically investigate metal dielectric nanocavity based composed on gold thin film and silicon nanoparticle. We study the relation between the distance between silicon nanosphere and metal layer and heating/enhancement factor. This work paves the way for the creation of perspective sensing systems based on the metal-dielectric nanocavity for biological and sensing applications.