Force sensing with a shaped dielectric micro-tool

¹ H. H. Wills Physics Laboratory, University of Bristol - Bristol, BS8 1TL, UK, EU
² SUPA, School of Physics and Astronomy, University of Glasgow - Glasgow, G12 8QQ, UK, EU
³ Department of Electrical and Electronic Engineering, University of Bristol - Bristol, BS8 1UB, UK, EU

^(a) s.h.simpson@bristol.ac.uk

Received: 9 July 2012
Accepted: 9 August 2012

Abstract

We analyse the thermal motion of a holographically trapped non-spherical force probe, capable of interrogating arbitrary samples with nanometer resolution. High speed video stereo-microscopy is used to track the translational and rotational coordinates of the micro-tool in three dimensions, and the complete 6 × 6 stiffness matrix for the system is determined using equipartition theorem. The Brownian motion of the extended structure is described in terms of a continuous distribution of thermal ellipsoids. A centre of optical stress, at which rotational and translational motion is uncoupled, is observed and controlled. Once calibrated, the micro-tool is deployed in two modes of operation: as a force sensor with <150 femto-Newton sensitivity, and in a novel form of photonic force microscopy.