Optical near-field of multipolar plasmons of rod-shaped gold nanoparticlesA. Hohenau, J. R. Krenn, G. Schider, H. Ditlbacher, A. Leitner, F. R. Aussenegg and W. L. SchaichEurophys. Lett., 69 4 (2005) 538-543DOI: https://doi.org/10.1209/epl/i2004-10388-9