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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gradient forces on double-negative particles in optical tweezers using Bessel beams in the ray optics regime

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Ambrosio, Leonardo A. [1] ; Hernandez-Figueroa, Hugo E. [1]
Total Authors: 2
[1] Univ Campinas Unicamp, Sch Elect & Comp Engn FEEC, Dept Microwave & Opt DMO, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Optics Express; v. 18, n. 23, p. 24287-24292, NOV 8 2010.
Web of Science Citations: 24

Gradient forces on double negative (DNG) spherical dielectric particles are theoretically evaluated for v-th Bessel beams supposing geometrical optics approximations based on momentum transfer. For the first time in the literature, comparisons between these forces for double positive (DPS) and DNG particles are reported. We conclude that, contrary to the conventional case of positive refractive index, the gradient forces acting on a DNG particle may not reverse sign when the relative refractive index n goes from vertical bar n vertical bar > 1 to vertical bar n vertical bar < 1, thus revealing new and interesting trapping properties. (C) 2010 Optical Society of America (AU)

FAPESP's process: 05/51689-2 - Optics and Photonics Research Center at UNICAMP
Grantee:Hugo Luis Fragnito
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC