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We optimized the resolution of nanohole arrays in metal films for refractive-index sensing by increasing the sensitivity with modifications to the hole-array parameters and by increasing the signal to noise ratio of the sensor system. The nanohole-array parameters (including film thickness, periodicity and diameter) were first optimized by finite-difference time-domain simulations, and then the arrays...
We have developed rectangular nanohole arrays in a gold film for enhanced sensitivity in biosensing applications. This paper describes the theory and fabrication of such arrays. Finite difference time domain simulations and experiments are used to determine the bulk sensitivity at 635 nm, and the sensitivity is improved by 14× for simulation and 7× for experiments with respect to circular hole arrays...
Near-field plates have been proposed to focus electromagnetic radiation to arbitrarily small subwavelength dimension. Here we investigate the use of plasmonic structures for near-field focusing plates in the visible-IR regime. Rectangular subwavelength structures are used to manipulate near-field using rectangular subwavelength apertures. Our simulations show the desired characteristics of equal transmission...
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