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Physical Review E
The extension of a particle ͑translational deviation͒ in an isotropic harmonic potential well is linearly proportional and parallel to the applied force. In an anisotropic trapping potential, the extension is instead related to the applied force by a compliance tensor. Using the focal spot of a high numerical aperture zone plate to create an elliptical potential and microfluidics to apply a calibrated force, we measure the two-dimensional extension of a trapped spherical particle. As a functiondoi:10.1103/physreve.79.042401 pmid:19518284 fatcat:tj27ejdznraubau6666kt5fzjm