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We present a theoretical analysis of the effects of short range surfaceplasmon polariton excitation on sub-wavelength bridges in metal gratings. Weshow that localized resonances in thin metal bridges placed within the slit ofa free-standing silver grating dramatically modify transmission spectra andboost absorption regardless of the periodicity of the grating. Additionally,the interference of multiple localized resonances makes it possible to tailorthe absorption properties of ultrathin gratings, regardless of the apertures'geometrical size. This tunable, narrow-band, enhanced-absorption mechanismtriggered by resonant, short range surface plasmon polaritons may also enhancenonlinear optical processes like harmonic generation, in view of the largethird-order susceptibility of metals.

Tailoring absorption in metal gratings with resonant ultra-thin bridges