Abstract

At large NAs a micro-Fresnel zone plate produces a focal spot that is more elliptical than that produced by an objective lens with the same NA. Using this anisotropy we demonstrate a method for modulating the spring constant of an optical trap by rotating the linear input polarization. The focal spot ellipticity is enhanced by the apodization factor of the zone plate and its extremely high NA. By measuring the positions of trapped particles we obtain two-dimensional histograms of particle position. These indicate that the trap spring constant is 2.75 times larger perpendicular to the incident polarization than along it. The elliptical focal spot distribution can be rotated by rotating the incident polarization, allowing the spring constant along a given direction to be modulated.

© 2008 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Scanning microscopy using a short-focal-length Fresnel zone plate

Ethan Schonbrun, Winnie N. Ye, and Kenneth B. Crozier
Opt. Lett. 34(14) 2228-2230 (2009)

Simultaneous calibration of optical tweezers spring constant and position detector response

Antoine Le Gall, Karen Perronet, David Dulin, André Villing, Philippe Bouyer, Koen Visscher, and Nathalie Westbrook
Opt. Express 18(25) 26469-26474 (2010)

Experimental demonstration of square Fresnel zone plate with chiral side lobes

A. Vijayakumar, B. Vinoth, Igor V. Minin, Joseph Rosen, Oleg V. Minin, and Chau-Jern Cheng
Appl. Opt. 56(13) F128-F133 (2017)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription