Toronto Metropolitan University
Browse
oe-23-22-29089.pdf (1.55 MB)

Decoupling and tuning the light absorption and scattering resonances in metallic composite nanostructures

Download (1.55 MB)
journal contribution
posted on 2023-09-06, 18:45 authored by Yossef Danan, Yehonatan Ramon, Jonathan Azougi, Alexandre DouplikAlexandre Douplik, Zeev Zalevsky

Utilizing the localized surface plasmon resonance (LSPR) effect of metallic nanoparticles enables their usage as contrast agents in a variety of applications for medical diagnostics and treatment. Those applications can use both the very strong absorption and scattering properties of the metallic nanoparticle due to their LSPR effects. There are certain applications where domination of the scattering over absorption or vice versa would be an advantage. However, the scattering and absorption resonance peaks have practically the same spectral location for solid noble metal nanoparticles at a certain domination of one over the other. In this paper we present gold nanoparticles coated with silicon that switches the order between the scattering and the absorption magnitude at the resonance peak by up to 34% in scattering-absorption ratio and tune the plasmon resonance over the spectrum by up to 56nm. This is obtained by modifying the refractive index of the silicon coating of the nanoparticle by illuminating it with a pumping light due to the plasma dispersion effect in silicon.

 

History

Language

English

Usage metrics

    Physics

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC