Optical and Dielectric Properties of Plasmonic Core-Shell Nanoparticles: Fe2O3/Au and Fe3O4/Au

The optical and dielectric properties of plasmonic of Fe2O3/Au and Fe3O4/Au core/shell nanoparticles were studied using Finite Element computational approach. The optical response of these nanostructures was investigated through the computation of the real and the imaginary parts of the effective dielectric permittivity and the absorption cross-section in the visible-near infrared spectral range. Our findings are as follows. Firstly, we have compared our obtained numerical results with those predicted by Maxwell-Garnett effective medium theory. Secondly, the obtained results reveal that the localized surface plasmons resonance (LSPR) peak shifts to near infrared for a Fe2O3/Au-nanoparticle are similar to that of a Fe3O4/Au-nanoparticle having the same geometric parameters. Thirdly, the optical characteristics of the plasmonic nanoparticles were also studied. Finally, we hope that the developed numerical method can be extended to investigate the electromagnetic coupling within or between particles and its effect on the plasmonic behaviors. This makes the core/shell composite nanoparticles extremely interesting for magnetic, optical and biomedical applications.

Automated summary

The optical and dielectric properties of Fe2O3/Au and Fe3O4/Au core/shell nanoparticles were studied using Finite Element computational approach. Results showed the shift of the localized surface plasmons resonance peak to near infrared and the potential for extending the numerical method to investigate electromagnetic coupling. These core/shell composite nanoparticles are promising for magnetic, optical, and biomedical applications.