Optimization of metal gratings for SPR sensing applications

Optical sensors based on the surface plasmon resonance (SPR) effect are generally designed in a prism coupling configuration. Metal gratings can also be used to support surface plasmons, in turn allowing for the design of alternative, SPR based, sensor configurations. Determination of design parameters for developing such sensors is an important step for fabrication of these devices. In this paper the spectral dependence of sinusoidal metal grating parameters, represented by amplitude and periodicity, for front surface sensors is calculated to allow maximum sensitivity of the device. Results may be an important tool for those investigators involved in developing new applications of the technique.