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Surface plasmon optical tweezers: Tunable optical manipulation in the femtonewton range

Journal article
Authors Maurizio Righini
Giovanni Volpe
Christian Girard
Dmitri Petrov
Romain Quidant
Published in Physical Review Letters
Volume 100
ISSN 00319007
Publication year 2008
Published at
Language en
Subject categories Physical Sciences

Abstract

We present a quantitative analysis of 2D surface plasmon based optical tweezers able to trap microcolloids at a patterned metal surface under low laser intensity. Photonic force microscopy is used to assess the properties of surface plasmon traps, such as confinement and stiffness, revealing stable trapping with forces in the range of a few tens of femtonewtons. We also investigate the specificities of surface plasmon tweezers with respect to conventional 3D tweezers responsible for their selectivity to the trapped specimen's size. The accurate engineering of the trapping properties through the adjustment of the illumination parameters opens new perspectives in the realization of future optically driven on-a-chip devices. © 2008 The American Physical Society.

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