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.
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.