Improving sensitivity of existing surface plasmon resonance systems with grating-coupled short-range surface plasmons

Abstract

Here we show that surface plasmon resonance sensors that typically use 760 nm wavelength Kretschmann-Raether coupling to a 50 nm thick gold film can have 3 times higher surface sensitivity by using local resonances from periodically arranged short-range modes in the same configuration. Considering shot noise, the resolution was found to improve four-fold. This was calculated by matching the design wavelength and minimum angle as calculated by rigorous coupled wave analysis, giving a period of 250 nm in a 10 nm thick gold film and a gap length of 40 nm. Finite difference time domain simulations were used to confirm that the short-range modes correspond to a localized surface plasmon resonances. The present short-range plasmon approach can be used to improve the sensitivity in monitoring biomolecule interactions.

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