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Phys. Rev. B 70, 054202 (2004) [19 pages]

Electromagnetic density of states and absorption of radiation by aggregates of nanosphereswith multipole interactions

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Vadim A. Markel*
Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

Vitaliy N. Pustovit
Department of Physics, Jackson State University, Jackson, Mississippi 39217, USA

Sergei V. Karpov
L.V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russia

Alexander V. Obuschenko
Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russia

Valeriy S. Gerasimov and Ivan L. Isaev
Department of Physics and Engineering, Krasnoyarsk State Technical University, Krasnoyarsk 660028, Russia

Received 15 December 2003; revised 9 April 2004; published 27 August 2004

We calculate the quasistatic electromagnetic density of states for aggregates of touching spheres, in particular, linear chains and computer-generated random fractal aggregates. Multipole moments with orders of up to L=64 are taken into account for random aggregates with the number of particles of up to N=100 and up to L=8000 for linear chains. Extensive comparisons with the dipole approximation and geometrical cluster renormalization method are performed. Extinction spectra are calculated for several metals and black carbon. Long wavelength electromagnetic properties of fractal aggregates are considered in details.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.054202
DOI:
10.1103/PhysRevB.70.054202
PACS:
78.67.Bf, 41.20.Cv, 73.20.Mf

*Author to whom correspondence should be addressed. Electronic address: vmarkel@mail.med.upenn.edu

Also at: the Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 17 General Naumov St., 03164 Kiev, Ukraine. Electronic address: vitaliy.pustovit@ccaix.jsums.edu

Electronic address: karpov@iph.krasn.ru