Abstract
This paper presents a subwavelength grating based multilayer surface
plasmon resonance biosensor (SPRB) which includes a periodic array of subwavelength
grating on top of a layer of graphene sheet in the biosensor. The proposed
biosensor is named grating-graphene SPRB (GG-SPRB). The aim of the proposed
multilayer structure is to improve the sensitivity of the SPRB through monitoring
of the biomolecular interactions of DNA hybridization. Significant sensitivity
improvement is obtained for the GG-SPRB compared with the conventional SPRB.
The result of the numerical investigation of the GG-SPRB is presented and
compared with a theoretically developed multilayer matrix formalism, and a
good agreement has been observed. In addition, an optimization of the grating
dimensions including volume factor, grating depth, grating angle, grating
period, and grating geometry (e.g., rectangular, sinusoidal and triangular)
is presented. The outcome of the investigation presented in this paper identifies
desired functioning conditions corresponding to the best design parameters
for the GG-SPRB.
© 2013 IEEE
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