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Proceedings Paper

Towards Casimir force measurements with optical tweezers (Conference Presentation)
Author(s): Paulo A. Maia Neto; Luis Pires; Diney Ether Jr.; Ricardo S. Decca; Nathan B. Viana; Gert Ingold; Daniel Martinez; Yareni A. Ayala; Felipe Siqueira Rosa; Herch Moysés Nussenzveig; Stefan Umrath

Paper Abstract

We propose to use optical tweezers to probe the Casimir interaction between micro-spheres inside a liquid medium for geometric aspect ratios far beyond the validity of the widely employed proximity force approximation. This setup has the potential for revealing unprecedented features associated to the non-trivial role of the spherical curvatures. For a proof of concept, we measure femtonewton double-layer forces between polystyrene microspheres at distances above 400 nm by employing very soft optical tweezers, with stiffness of the order of fractions of a fN/nm. As a future application, we propose to tune the Casimir interaction between a metallic and a polystyrene microsphere in saline solution from attraction to repulsion by varying the salt concentration. With those materials, the screened Casimir interaction may have a larger magnitude than the unscreened one.

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10120, Complex Light and Optical Forces XI, 1012016 (28 April 2017); doi: 10.1117/12.2255048
Show Author Affiliations
Paulo A. Maia Neto, Univ. Federal do Rio de Janeiro (Brazil)
Luis Pires, Univ. Federal do Rio de Janeiro (Brazil)
Diney Ether Jr., Univ. Federal do Rio de Janeiro (Brazil)
Ricardo S. Decca, Indiana Univ.-Purdue Univ. Indianapolis (United States)
Nathan B. Viana, Univ. Federal do Rio de Janeiro (Brazil)
Gert Ingold, Univ. Augsburg (Germany)
Daniel Martinez, Univ. Federal do Rio de Janeiro (Brazil)
Yareni A. Ayala, Univ. Federal do Rio de Janeiro (Brazil)
Felipe Siqueira Rosa, Univ. Federal do Rio de Janeiro (Brazil)
Herch Moysés Nussenzveig, Univ. Federal do Rio de Janeiro (Brazil)
Stefan Umrath, Univ. Augsburg (Germany)

Published in SPIE Proceedings Vol. 10120:
Complex Light and Optical Forces XI
David L. Andrews; Enrique J. Galvez; Jesper Glückstad, Editor(s)

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