Abstract
The Gold and silver nanorods (NRs) have unique localized surface plasmonic resonance (LSPR) properties, which are very sensitive to aspect ratio and can be used in the attractive application (biomedical technologies, plasmon- enhanced spectroscopies, and optical and optoelectronic devices). A theoretical investigation was done based on FDTD (Lumerical software) for the plasmon properties of Nanorods of two different noble metallic material (Ag and Au) as a function for the aspect ratio. Ag and Au NRs exhibit two anisotropic LSPR modes, transverse (LSPRT) and longitudinal (LSPRL) with the high-order multipole resonances appearance. Dipole plasmonic resonance mode shows the remarkable tuning of LSPRL in the broad spectral region (Vis-NIR), compared to the small tuning of LSPRT in the narrow spectral region with increased the aspect ratio in both of Ag and Au NRs. Furthermore, their excitation cross-section are also improved with increasing the aspect ratio and shows better enhancement an AgNRs compared to AuNRs.
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