Modeling of absorption and scattering properties of core -shell nanoparticles for application as nanoantenna in optical domain

27th IUPAP Conference on Computational Physics

物理学;计算机科学

Devi, Jutika^1 ; Saikia, Rashmi^2 ; Datta, Pranayee^1

Department of Electronics and Communication Technology, Gauhati University, Guwahati

Assam

781014, India^1

Department of Electronics and Communication Engineering, Tezpur University, Napaam

Assam

784028, India^2

关键词: Absorption and scatterings;    Controllable parameters;    Dielectric functions;    Extinction efficiency;    Far field radiation patterns;    Resonance wavelengths;    Resonant wavelengths;    Silica core-shell nanoparticles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012039/pdf
DOI  :  10.1088/1742-6596/759/1/012039

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The present paper describes the study of core-shell nanoparticles for application as nanoantenna in the optical domain. To obtain the absorption and extinction efficiencies as well as the angular distribution of the far field radiation pattern and the resonance wavelengths for these metal-dielectric, dielectric-metal and metal-metal core-shell nanoparticles in optical domain, we have used Finite Element Method based COMSOL Multiphysics Software and Mie Theory. From the comparative study of the extinction efficiencies of core-shell nanoparticles of different materials, it is found that for silica - gold core - shell nanoparticles, the resonant wavelength is greater than that of the gold - silver, silver-gold and gold-silica core - shell nanoparticles and also the radiation pattern of the silica-gold core-shell nanoparticle is the most suitable one from the point of view of directivity. The dielectric functions of the core and shell material as well as of the embedded matrix are extremely important and plays a very major role to tune the directivity and resonance wavelength. Such highly controllable parameters of the dielectric - metal core - shell nanoparticles make them suitable for efficient coupling of optical radiation into nanoscale structures for a broad range of applications in the field of communications.