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Optimization of plasmonic nanostructures of Gold (Au) and Silver (Ag) nano-sphere and nano-shell dimers have been investigated by using the simulation technique. The convergence study has been carried for all the simulated nanodimer structures. Here, we explored nano-rod, nano-bowtie, and nano-pillar plasmonic nanostructures to study the effect of length, gap separation, height, and thickness on optimization of the structure. Further, the enhancement in the electric field and resonance wavelength have been evaluated. A decrement in the electric field with the increase in gap separation between Ag and Au nano-dimer structures has been observed. These calculated results show a relatively high enhancement in the case of Ag as compare to Au. An enhancement in the electric field and red shifting of the wavelength is observed with a decrease and increase in the height and length of the plasmonic nanostructures of Ag and Au respectively. However, a reduction in the enhancement of field has been observed with an increment in the thickness of hollow and bimetallic nano-dimer structures. Moreover, larger enhancement in the electric field has been observed in the case of hollow nano-rod as compared to the nano-bowtie shells and nano-pillar plasmonic structure. The enhancement peak in nano-shell dimer structure is lying in the infrared (IR) region while the solid and bi-metallic dimer nanostructures enhancement peak is in near IR region. These optimized plasmonic nanostructures suggest their potential applications in the designing of the modern devices for communication and detection of the hydrogen molecule.
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