Abstract

We explore periodic gold nanoposts as substrates for the enhanced surface plasmon resonance imaging (SPRi) detection of DNA hybridization. Rigorous coupled-wave analysis was used to model and design the nanopost-based SPRi biosensor. Arrayed gold nanoposts on gold-coated glass substrate, with various widths and periodicity, were fabricated using electron-beam lithography and characterized with scanning electron and atomic force microscopy. A scanning-angle SPRi apparatus was used to conduct the kinetic analysis of DNA hybridization on nanopost-based sensor surface and assess the corresponding SPR signal amplification. Experimental results showed that both the nanostructure size and period influenced the SPR signal enhancement; the optimized $30\mathrm{nm}$ height, $50\mathrm{nm}$ size, and $110\mathrm{nm}$ period nanoposts provided a fivefold SPR signal amplification compared with the plain $50\mathrm{nm}$ thick gold film used as control.

© 2007 Optical Society of America

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