Simulation of a Plasmonic Tip-Terminated Scanning Nanowire Waveguide for Molecular Imaging

Citation:

N. P. Malcolm, Heltzel, A. J., Sokolov, K. V., Shi, L., and Howell, J. R., “Simulation of a Plasmonic Tip-Terminated Scanning Nanowire Waveguide for Molecular Imaging,” Appl. Phys. Lett., vol. 93, pp. 193101, 2008.

Abstract:

Finite difference time domain simulation reveals plasmon coupling and local field enhancement at the gap between the gold nanoparticle (NP) tip of a ZnOnanowire (NW) waveguide and a gold-coated substrate or a gold NP probe. The region of field enhancement is about three times smaller than the 100 nm diameter of the gold NP tip, making the NW waveguide grown on a transparent microcantilever well-suited for near field imaging of single molecules immobilized on a gold substrate or gold NP-labeled cell membranes with superior spatial resolution and signal to noise ratio.

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