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Combiningmultiplematerials in a single nanoparticle has gainedmuch attention in recent years. In this work, the optical absorption property of gold-silicon (Au@Si) core–shell nanoparticles (NPs) embedded in a silicamatrix were are theoretically demonstrated in thewavelength range from400 to 800 nm, based on a discrete-dipole approximationmethod. For a single core–shell nanoparticle, the study revealed the localized surface plasmon resonance (LSPR) showed a regular redshift with an increase in its Si shell thickness. The observed redshifts in the LSPR peakswere in agreement with the experimental results. The optical absorption property was also observed for twoAu@Si core–shell NPs separated, on average, by a distance as small as a few nanometers. The results suggest that the shifts in spectral peak position depend on both the interparticle distance and geometric configuration of the nanoparticles. The obtained results also suggest that this nanomaterial, with a strongwavelengthtuneable absorption property, could be an attractive candidate for applications in biomedicine, nanocatalysis, optical devices, and future functional devices.

Theoretical calculation of the optical absorption property of nanoparticles composed of an Au Core and Si shell embedded in silica