Assembly and force measurement with SPM-like probes in holographic optical tweezers

L Ikin, D.M Carberry, G.M Gibson, M.J padgett, M.J Miles

Research output: Contribution to journalArticle (Academic Journal)

53 Citations (Scopus)

Abstract

In this paper we demonstrate the optical assembly and control of scanning probe microscopy (SPM)-like probes, using holographic optical tweezers. The probes are formed from cadmium sulphide rods and silica microspheres, the latter providing explicit trapping handles. Calibration of the trap stiffness allows us to use a precise measure of probe displacement to calculate the applied forces. We demonstrate that the optically controlled probe can exert a force in excess of 60 pN, over an area of 1 x 10(-13) m(2), with a force sensitivity of 50 fN. We believe that probes similar to the ones presented here will have applications as nanotools in probing laser-sensitive cells/materials.
Translated title of the contributionAssembly and force measurement with SPM-like probes in holographic optical tweezers
Original languageEnglish
Article number023012
Pages (from-to)1-9
Number of pages9
JournalNew Journal of Physics
Volume11
DOIs
Publication statusPublished - Feb 2009

Bibliographical note

Publisher: IOP Publishing

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