Optical trapping calculations for metal nanoparticles. Comparison with experimental data for Au and Ag spheres. (Articolo in rivista)

Type
Label
  • Optical trapping calculations for metal nanoparticles. Comparison with experimental data for Au and Ag spheres. (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Saija R.; Denti P.; Borghese F.; Maragò O.M.; and Iatì M.A. (2009)
    Optical trapping calculations for metal nanoparticles. Comparison with experimental data for Au and Ag spheres.
    in Optics express
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Saija R.; Denti P.; Borghese F.; Maragò O.M.; and Iatì M.A. (literal)
Pagina inizio
  • 10231 (literal)
Pagina fine
  • 10241 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Dipartimento di Fisica della Materia e Ingegneria Elettronica, Università di Messina, Salita Sperone 31, 98166 Messina, Italy 2) Istituto per i Processi Chimico-Fisici (Messina), Consiglio Nazionale delle Ricerche,Salita Sperone, 98158 Faro Superiore, Messina, Italy (literal)
Titolo
  • Optical trapping calculations for metal nanoparticles. Comparison with experimental data for Au and Ag spheres. (literal)
Abstract
  • We calculate the optical forces on Au and Ag nanospheres through a procedure based on the Maxwell stress tensor. We compare the theoretical and experimental force constants obtained for gold and silver nanospheres finding good agreement for all particles with r < 80nm. The trapping of the larger particles recently demonstrated in experiments is not foreseen by our purely electromagnetic theory based on fixed dielectric properties. Since the laser power produces a heating that may be large for the largest spheres, we propose a model in which the latter particles are surrounded by a steam bubble. This model foresees the trapping of these particles and the results turn out to be in reasonable agreement with the experimental data. (literal)
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