Radiation Torque and Force on Optically Trapped Linear Nanostructures

F. Borghese, P. Denti, R. Saija, M. A. Iatì, and O. M. Maragò
Phys. Rev. Lett. 100, 163903 – Published 22 April 2008

Abstract

We study the optical trapping of highly elongated linear nanostructures in the focal region of a high-numerical aperture lens (optical tweezers). The radiation torque and trapping force on these nanostructures that are modeled as chains of identical spherical scatterers are calculated by means of multipole field expansions in the framework of the transition matrix approach. We investigate both orientational and trapping stability and calculate force constants and trap parameters in order to clarify the role of the linear geometry in the optical trapping mechanism. Furthermore, we calculate optical trapping of nanowires of different materials and compare our theoretical findings with available experimental results.

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  • Received 7 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.163903

©2008 American Physical Society

Authors & Affiliations

F. Borghese*, P. Denti, and R. Saija

  • Dipartimento di Fisica della Materia e Tecnologie Fisiche Avanzate, Università di Messina, Salita Sperone 31, 98166 Messina, Italy

M. A. Iatì and O. M. Maragò

  • Istituto per i Processi Chimico-Fisici (Messina), Consiglio Nazionale delle Ricerche, Salita Sperone, 98158 Faro Superiore, Messina, Italy

  • *borghese@ortica.unime.it
  • marago@its.me.cnr.it

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Vol. 100, Iss. 16 — 25 April 2008

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