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Enhanced transmissions through a gold film with arrays of subwavelength holesare theoretically studied, employing the rigid full vectorial three dimensionalfinite difference time domain method. Influence of air-holes shape to thetransmission is firstly studied, which confirms two different resonancesattributing to the enhanced transmission: the localized waveguide resonance andperiodic surface plasmon resonances. For the film coated with dielectriclayers, calculated results show that in the wavelength region of interest thelocalized waveguide resonant mode attributes to sensing rather than theperiodic gold-glass surface plasmon mode. Although the detected peak is fairlybroad and the shift is not too pronounced, we emphasize the contribution forsensing from the localized waveguide resonant mode, which may opens up new waysto design surface plasmon based sensors.

Enhanced transmission through arrays of subwavelength holes in gold films coated by a finite dielectric layer