We discuss the possibility of implementing a novel bio-sensing platform basedon the observation of the shift of the leaky surface plasmon mode that occursat the edge of the plasmonic band gap of metal gratings when an analyte isdeposited on top of the metallic structure. We provide experimental proof ofthe sensing capabilities of a two-dimensional array of gold nano-patches byobserving color variations in the diffracted field when the air overlayer isreplaced with a small quantity of Isopropyl Alcohol (IPA). Effects of roundedcorners and surface imperfections are also discussed. Finally, we also reportproof of changes in color intensities as a function of the air/filling ratio ofthe structure and discuss their relation with the diffracted spectra.
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