The optical power flow around a plasmonic particle has been a topic of research interest over the years [see e.g., Am. J. Phys. 51, 323 (1983) ; Opt. Express 13, 8372 (2005) ]. Here we revisit this problem with an emphasis on higher-order resonances, and we present the theoretical results of our analysis for such power-flow distribution for plasmonic nanoparticles at their multipolar resonances. Results for the second and third orders of resonance show optical power-flow patterns that are significantly different from that of the first-order resonance inside and around plasmonic superdirective nanoparticles, with multicenter vortices, saddle points, and saddle lines and with an anomalous circulation of power resembling higher-order modes in a resonant cavity. A potential application of these optical flow patterns to trap or move a neighboring nanoparticle is also briefly suggested.
© 2007 Optical Society of AmericaFull Article | PDF Article
M. V. Bashevoy, V. A. Fedotov, and N. I. Zheludev
Opt. Express 13(21) 8372-8379 (2005)
Mustafa H. Chowdhury, Stephen K. Gray, James Pond, Chris D. Geddes, Kadir Aslan, and Joseph R. Lakowicz
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