Design of Gaussian-Shaped and Double Sides Flanked Metallic Nano-Grating Surface Plasma Resonance Biosensors

In this paper, a new type of gaussian-shaped metallic nano-grating surface plasma resonance (NGSPR) biosensors and the design optimization process are presented in nano fabrication point of view. The influence of structural factors of nano- corrugations on the sensitivity of NGSPR sensors was investigated using the multiple multipole program (MMP) method. Biosensors with the line width of the gaussion profile about 50nm and the depth of the gaussion profile about 30nm show narrow and deep reflection peaks .The wavelength of the resonance reflection can be customized by adjusting the grating period. We predict that a high refractive idex sensitivity about 420nm/RIU can be obtained using our optimized structure. Sharp reflection resonance peaks with the full-width at half-maximum (FWHM) of 6nm will further increase the figure of merit (FOM) of the sensor. These reflection properties make it possible to be used as NGSPR biosensors.