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Nano-plasmonic-based structures for DNA sequencing

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Abstract

We propose novel nano-plasmonic-based structures for rapid sequencing of DNA molecules. The optical properties of DNA nucleotides have notable differences in the ultraviolet (UV) region of light. Using nanopore, bowtie, and bowtie-nanopore compound structures, probable application of the surface plasmon resonance (SPR) in DNA sequencing is investigated by employing the discrete dipole approximation method. The effects of different materials like chromium (Cr), aluminum (Al), rhodium (Rh), and graphene (Gr) are studied. We show that for Cr/Al/Gr/Rh, the nucleotide presented shifts the SPR spectra for the nanopore 1/29/5/34 to 14/39/15/67 nm, bowtie 8/2/49/38 to 31/20/79/55 nm, and bowtie-nanopore compound 25/77/5/16 to 80/80/22/39 nm. The Cr-based compound structure shows excellent sensitivity and selectivity which can make it a promising methodology for DNA sequencing.

© 2016 Optical Society of America

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