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  • Title: A microsphere coupler for a nanowire waveguide plasmonic probe for molecular imaging.
    Author: Heltzel A, Shi L, Howell JR.
    Journal: Nanotechnology; 2011 Jan 28; 22(4):045203. PubMed ID: 21157015.
    Abstract:
    Highly forward scattering of light by a silica microsphere is predicted by Mie theory. Finite-difference time-domain simulations are used to examine the use of a silica microsphere for coupling light into a ZnO nanowire terminated with a gold nanoparticle (NP) tip, intended for near-field imaging of single molecules immobilized on a gold substrate or gold nanoparticle-labeled cell membranes. The results show that plasmonic coupling at the Au tip is dependent on the incident angle of the excitation. Pre-conditioning the signal with the microsphere amplifies the coupling while reducing background energy levels, significantly boosting the signal-to-noise ratio.
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