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  • Title: Adiabatic nanofocusing scattering-type optical nanoscopy of individual gold nanoparticles.
    Author: Sadiq D, Shirdel J, Lee JS, Selishcheva E, Park N, Lienau C.
    Journal: Nano Lett; 2011 Apr 13; 11(4):1609-13. PubMed ID: 21425772.
    Abstract:
    We explore imaging of local electromagnetic fields in the vicinity of metallic nanoparticles using a grating-coupled scattering-type near-field scanning optical microscope. In this microscope, propagating surface plasmon polariton wavepackets are launched onto smooth gold tapers where they are adiabatically focused toward the nanometer-sized taper apex. We report two-dimensional raster-scanned optical images showing pronounced near-field contrast and demonstrating sub-30 nm resolution imaging of localized surface plasmon polariton fields of spherical and elliptical nanoparticles. By comparison to three-dimensional finite-difference time domain simulations, we conclude that virtually background-free near-field imaging is achieved. The microscope combines deep subwavelength resolution, high local field intensities and a straightforward imaging contrast, making it interesting for a variety of applications in linear and nonlinear nanospectroscopy.
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