Abstract
We have studied the angle and wavelength dependent extra-ordinary transmission of novel metal hole arrays that contain a dielectric pillar in each hole [1]. Similar to transmission spectra of conventional hole arrays, the measured transmission contains asymmetric resonances related to the excitation of surface plasmons on either side of the metal film. The pillars enhance the coupling of light to surface plasmons and introduce avoided crossings between the plasmon modes. We find that the dispersion of these plasmon modes can be described by the photonic bandstructure of a two-dimensional array of SiO2 pillars.
© 2009 IEEE
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