Optical near-field of multipolar plasmons of rod-shaped gold nanoparticles A. Hohenau, J. R. Krenn, G. Schider, H. Ditlbacher, A. Leitner, F. R. Aussenegg and W. L. Schaich Europhys. Lett., 69 4 (2005) 538-543 Published online: 19 January 2005 DOI: 10.1209/epl/i2004-10388-9