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Custom-Made Microspheres for Optical Tweezers

  • Anita Jannasch
  • Mohammad K. Abdosamadi
  • Avin Ramaiya
  • Suman De
  • Valentina Ferro
  • Aaron Sonnberger
  • Erik Schäffer
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1486)

Abstract

Due to their high position and force sensitivity and the ability to remotely apply forces and torques, optical tweezers are widely used in diverse fields, such as biology, material science, and physics. Often, small dielectric particles are trapped and used as probes, which for experimental convenience are mostly spherical and composed of silica or polystyrene. The optical properties of these materials together with the microsphere size determine the trapping efficiency, and the position and force resolution. However, using only a single, homogeneous, isotropic, and unstructured material limits the range of trapping properties and thereby the applications of optical tweezers. Here, we show how custom-made microspheres composed of coated high-refractive-index materials—titania and nanodiamonds—and birefringent, liquid crystals extend the range and combination of desired trapping properties. These custom-made microspheres either enable the generation of high forces, a high force or time resolution, or the applications of torques. Custom-made probes expand the range of possible experiments and approaches broadening the scope and applicability of optical tweezers.

Key words

Optical tweezers Core–shell particles Anti-reflection coating Nanonewton Microspheres Titania Nanodiamonds TEOS MCM-41 Liquid crystalline birefringent particles Angular trapping Rotation Optical torque 

Notes

Acknowledgements

We thank K. Sandomirski and T. Gisler for a detailed protocol how to make birefringent microspheres, Basudev Roy for help with the rotational power spectrum, and Sven A. Szilagyi, Melanie Eckert, Michael Bugiel, and Mayank Chugh for comments on the manuscript. This work was supported by the European Research Council (ERC Starting Grant 2010, Nanomech 260875), the Rosa Luxemburg Foundation, the Technische Universität Dresden and the Universität Tübingen.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Anita Jannasch
    • 1
  • Mohammad K. Abdosamadi
    • 1
  • Avin Ramaiya
    • 1
  • Suman De
    • 1
  • Valentina Ferro
    • 1
  • Aaron Sonnberger
    • 1
  • Erik Schäffer
    • 1
  1. 1.Center for Plant Molecular BiologyUniversität TübingenTübingenGermany

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