On the Scattering and Absorption by the SiO₂-VO₂ Core-Shell Nanoparticles Under Different Thermal Conditions

Abstract

The core-shell kinds of nanoparticles are greatly useful in biomedical applications inclined to targeted drug delivery, sensing, etc. The electromagnetic interaction characteristics of silicon dioxide (SiO2)-vanadium dioxide (VO2) core-shell nanoparticle of deep subwavelength size are discussed. The assumptions allow the use of Rayleigh scattering theory for analytical approach. Because of VO2 having inherent temperature-dependent constitutive characteristics, the light-matter interaction properties are taken into account in terms of normalized polarizability, scattering- and absorption cross-sections, considering the different values of size parameters as well as ambient temperature. It is found that the dimensional properties of chosen nanoparticles can be exploited to tune the spectral features, and also, the usefulness of these becomes obvious in temperature sensing. Moreover, the effect of interchanging the core/shell mediums (of the nanoparticles) on the scattering and absorption characteristics are also obtained. The results reveal the loss of resonance in this case.

Keywords

• Core-shell nanoparticle
• scattering
• polarizability