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Combining multiple materials in a single nanoparticle has gained much attention in recent years. In this work, the optical absorption property of gold-silicon (Au@Si) core-shell nanoparticles (NPs) embedded in a silica matrix were are theoretically demonstrated in the wavelength range from 400 to 800 nm, based on a discrete-dipole approximation method. 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 peaks were in agreement with the experimental results. The optical absorption property was also observed for two Au@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 strong wavelengthtuneable absorption property, could be an attractive candidate for applications in biomedicine, nanocatalysis, optical devices, and future functional devices.

Bifunctional nanomaterial Fe 3 O 4 @Au core-shell is a kind of nanoparticle that includes magnetic iron oxide core with gold coated. It can be used in can achieve the controllable and tunable electromagnetic field enhancement and may open up exciting opportunities to engineer new materials used in biomedical applications. This research work aims at theoretical investigating the basic optical absorption property of Fe 3 O 4 @Au core-shell with varying number particles, inter-particle distance, and direction of incident light using the discrete dipole approximation method (DDA) in the wavelength of visible to near-infrared ranges of the electromagnetic wave spectrum. The results were observed that these parameters can be enhanced optical light absorption and tuned the LSPR peak position. The obtained results might be used for basic fabricating the more performance specific applications like a drug in life science.

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