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Absorption efficiency profiles and localized surface plasmon resonance (LSPR)wavelengths are reported for metallic core-shell nanoparticles (NPs) placedover a BK7 glass substrate. A numerical study is performed with the vectorizedversion of the discrete dipole approximation with surface interactions(DDA-SI-v). Gold (Au) and silver (Ag) metallic components are used for thesimulations of two different core-shell structures. Absorption enhancement andthe hybrid modes of plasmon resonances of the core-shell structures arecompared by using a measure that defines a size configuration. It is observedthat a small volume fraction of the core sizes results in shell domination overthe plasmon response. An additional study is conducted to discern thesensitivity of the refractive index of nanoparticles in different surroundingenvironments. With a selected core-shell size configuration of Ag-Au pairs, asignificant absorption enhancement with a redshift of LSPR wavelength isobserved for both Ag core-Au shell and Au core-Ag shell NPs. The absorptionbehavior of the bare metallic NPs and selected core-shell pairs in proximity toan external probe is also analyzed. The gallium phosphide (GaP) and silicon(Si) AFM tip usage are investigated with transverse electric (TE) andtransverse magnetic (TM) wave polarizations. It is observed that the dominanceof light polarization on the absorption enhancement of the NPs switches atdifferent wavelengths, where the dielectric transition for tip materialsoccurs. These findings show the possible targeted uses of metallic core-shellnanoparticles in several areas such as nanomanufacturing, localized heating,bio-sensing, and material detection applications.

Absorption and Plasmon Resonance of Bi-Metallic Core-Shell Nanoparticles on a Dielectric Substrate Near an External Tip