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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.)

Analytical calculation of optical forces on spherical particles in optical tweezers: tutorial

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Author(s):
Ranha Neves, Antonio Alvaro [1] ; Cesar, Carlos Lenz [2]
Total Authors: 2
Affiliation:
[1] Univ Fed ABC UFABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil
[2] Univ Fed Ceara, Dept Fis, Fortaleza, CE - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS; v. 36, n. 6, p. 1525-1537, JUN 1 2019.
Web of Science Citations: 3
Abstract

Arthur Ashkin was awarded the 2018 Nobel Prize in Physics for the invention of optical tweezers. Since their first publication in 1986, optical tweezers have been used as a tool to measure forces and rheological properties of microscopic systems. For the calibration of these measurements, knowledge of the forces is fundamental. However, it is still common to deduce the optical forces from assumptions based on the particle size with respect to the trapping laser wavelength. This shows the necessity to develop a complete and accurate electromagnetic model that does not depend on early approximations of the force model. Furthermore, the model we have developed has several advantages, such as morphology-dependent resonances, size dependence for large spheres, and multipole effects from smaller particles, just to name a few. In this tutorial, we review and discuss the physical modeling of optical forces in optical tweezers, which are the resultant forces exerted by a trapping beam on a sphere of any size and composition. (C) 2019 Optical Society of America (AU)

FAPESP's process: 17/13543-3 - Characterizing thermal properties of metallic nanoparticles optically trapped
Grantee:Antonio Alvaro Ranha Neves
Support Opportunities: Scholarships abroad - Research