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J. Parsons, Euan Hendry, C. P. Burrows, Baptiste AuguiÃ©, J. Roy Sambles, and William L. Barnes, Physical Review B, Vol. 79, article 073412 (2009). Copyright Â© 2009 by the American Physical Society.We compare the optical response of periodic nondiffracting metallic nanoparticle and nanohole arrays. Experimental data from both structures show a pronounced minimum in their wavelength-dependent transmittance that, through numerical modeling, we identify as being due to the excitation of localized surface-plasmon resonances associated with the nanoparticles/nanoholes. Our main finding is that, while the optical response of the nanoparticle arrays is largely independent of interparticle separation, the response from nanohole arrays shows a marked dependence on interhole separation. We attribute this effect to coupling between localized surface-plasmon resonances mediated by the symmetric surface plasmon-polaritons associated with the metal film. Further numerical modeling supports this view

Localized surface-plasmon resonances in periodic nondiffracting metallic nanoparticle and nanohole arrays