Plasmonic response of liquid metal nanoparticles with gold coatings.

The optical properties of 4 liquid metals Ga, Hg, Cs and Rb are calculated in core-shell bimetallic nanoparticles system over size parameters. The localized surface plasmon resonance (LSPR) of liquid and noble metal for different sizes and shell thickness are effectively tuned over electromagnetic spectrum. In addition, by using Mie Theory size is optimized in terms of structural parameters. The optical frequencies of these core-shell nanostructures are observed to be shifting in UV-Visible-NIR region with enhanced optical efficiencies. Two LSPR peaks are observed for Hg@Au core-shell nanoparticles in UV and Visible region simultaneously. For Cs and Rb almost same plasmonic response is observed, however efficiencies of Rb are better than all other nanoparticles. The calculated absorption and scattering efficiencies of all different compositions for respective applications are discussed. [ABSTRACT FROM AUTHOR]