| Full text | |
| Author(s): |
Diniz, K.
[1, 2]
;
Dutra, R. S.
[1, 3]
;
Pires, L. B.
[1, 2]
;
Viana, N. B.
[1, 2, 4]
;
Nussenzveig, H. M.
[1, 2, 4]
;
Maia Neto, P. A.
[1, 2, 4]
Total Authors: 6
|
| Affiliation: | [1] Univ Fed Rio de Janeiro, Inst Fis, Caixa Postal 68528, BR-21941972 Rio De Janeiro, RJ - Brazil
[2] Univ Fed Rio de Janeiro, Inst Ciencias Biomed, LPO COPEA, BR-21941590 Rio De Janeiro, RJ - Brazil
[3] Inst Fed Educ Ciencia & Tecnol, LISComp IFRJ, Rua Sebastiao de Lacerda, BR-26600000 Paracambi, RJ - Brazil
[4] Univ Fed Rio de Janeiro, CENABIO Ctr Nacl Biol Estrutural & Bioimagem, BR-21941902 Rio De Janeiro, RJ - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Optics Express; v. 27, n. 5, p. 5905-5917, MAR 4 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
We show that the optical force field in optical tweezers with elliptically polarized beams has the opposite handedness for a wide range of particle sizes and for the most common configurations. Our method is based on the direct observation of the particle equilibrium position under the effect of a transverse Stokes drag force, and its rotation around the optical axis by the mechanical effect of the optical torque. We find overall agreement with theory, with no fitting, provided that astigmatism, which is characterized separately, is included in the theoretical description. Our work opens the way for characterization of the trapping parameters, such as the microsphere complex refractive index and the astigmatism of the optical system, from measurements of the microsphere rotation angle. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (AU) | |
| FAPESP's process: | 14/50983-3 - INCT 2014: complex fluids |
| Grantee: | Antonio Martins Figueiredo Neto |
| Support Opportunities: | Research Projects - Thematic Grants |