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  1. Enhancement of axial force of optical tweezers by utilizing a circular stop at the back focal plane of the objective
Enhancement of axial force of optical tweezers by utilizing a circular stop at the back focal plane of the objective
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Enhancement of axial force of optical tweezers by utilizing a circular stop at the back focal plane of the objective

Gorjizadeh Alinezhad, H

Enhancement of axial force of optical tweezers by utilizing a circular stop at the back focal plane of the objective

Gorjizadeh Alinezhad, H ; Sharif University of Technology | 2018

607 Viewed
  1. Type of Document: Article
  2. DOI: 10.1364/JOSAB.35.002654
  3. Publisher: OSA - The Optical Society , 2018
  4. Abstract:
  5. Optical tweezers are indispensable force spectroscopes. The trap stiffness and the linear force range of the instrument determine the working force range of the instrument. Here we show both theoretically and experimentallythat utilizing a circular obstruction at the back focal plane of the objective can significantly increase the maximumlinear force. For instance, utilizing a disk with an obstruction ratio of 0.773 could increase the maximum linearforce by a factor of ∼39 when a 3.4 μm polystyrene bead is trapped. We also show that this simple beam shapingmethod can significantly improve the maximum applicable force per unit power of the laser entering the objectivelens. © 2018 Optical Society of America
  6. Keywords:
  7. Focusing ; Axial forces ; Back focal planes ; Per unit ; Polystyrene beads ; Simple beams ; Trap stiffness ; Working force ; Optical tweezers
  8. Source: Journal of the Optical Society of America B: Optical Physics ; Volume 35, Issue 11 , 2018 , Pages 2654-2660 ; 07403224 (ISSN)
  9. URL: https://www.osapublishing.org/josab/abstract.cfm?uri=josab-35-11-2654