Abstract

A high spectral resolution, 2D nanohole-array-based surface plasmon resonance sensor that operates at normal or near normal incidence—facilitating high spatial resolution imaging—is presented. The angular and spectral transmittance of the structure is modified from a Fano type to a pure Lorentzian line shape with a parallel and orthogonal polarizer–analyzer pair. This change leads to a linewidth narrowing that maximizes the sensor resolution, which we show to be of O(105) refractive index units (RIU). We estimate the potential of this system of O(106) RIU under optimal conditions.

© 2006 Optical Society of America

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