Plasmonic Resonance Excited Extinction Spectra of Cross-Shaped Ag Nanoparticles
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Plasmonic properties of cross-shaped Ag nanoparticles are investigated theoretically using finite-difference time-domain algorithm. Electric field (E-field) distribution of a single cross-shaped Ag nanoparticle with different shape parameters and patterned nanoparticles with different periods were presented. Both red shift and blue shift of the extinction spectra were observed. The simulation results demonstrated that the strong E-field intensity is located at sharp corner of the nanoparticles. And E-field intensity of the nanoparticle array is much stronger than that of a single Ag nanoparticle. Enhancement of the large localized E-field originating from the nanoparticles was analyzed. Corresponding influence of “hot spots” effect on enhancing Raman scattering was discussed as well.