Thermoplasmonic of Single Au@SiO2 and SiO2@Au Core Shell Nanoparticles in Deionized Water and Poly-vinylpyrrolidoneMatrix

Gatea Et Al

doi:10.21123/bsj.16.2.0376

Abstract

Metal nanoparticles can serve as an efficient nano-heat source with confinement photothermal effects. Thermo-plasmonic technology allows researchers to control the temperature at a nanoscale due to the possibility of precise light propagation. The response of opto-thermal generation of single gold-silica core-shell nanoparticle immersed in water and Poly-vinylpyrrolidone surrounding media is theoretically investigated. Two lasers (CW and fs pulses) at the plasmonic resonance (532 nm) are utilized. For this purpose, finite element method is used via COMSOL multiphysics to find a numerical computation of absorption cross section for the proposed core –shell NP in different media. Thermo-plasmonic response for both lasers is studied. The heat profile of different nanostructures is estimated. The results revealed that the temperature distribution profile was varied due to changing in the relative volume fraction between the core and the shell of nanoparticle.

Highlights

The thermo-plasmonic field combines nano-thermodynamics and nano-optics [1]
Noble metals have a distinguished surface plasmon resonance when it is illuminated by optical radiation resonant with their surface plasmon oscillation
They absorb the energy of optical radiation and convert it into heat through photophysical processes [7] by three time step processes: first, electronic absorption, second electron-phonon thermalization, and third, the heat is diffused to the surrounding media [8].The rate of absorption and laser power are controllable where they affect directly on the rate of generated heat by nanoparticles [9]

Summary

Introduction

The thermo-plasmonic field combines nano-thermodynamics and nano-optics [1]. It focuses on absorption of optical energy and converted into controllable a nano-source of heat. Numerical simulation: A- Optical part: COMSOL multiphysics 5.3a was utilized to find a numerical computation of the absorption cross-section for the proposed core – shell NP in different media, where the thickness of the Perfectly Matched Layer (PML)was λ/2.The symmetry of a quarter sphere is only considered from the simulation geometry for the simplicity[18] as shown in Fig.[1].

Results

Conclusion