Tunable optical tweezers for wavelength-dependent measurements

Brooke Hester, Gretchen K Campbell, Carlos López-Mariscal, Carly S. Filgueira, Ryan Huschka, Naomi J. Halas, Kristian Helmerson

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Optical trapping forces depend on the difference between the trap wavelength and the extinction resonances of trapped particles. This leads to a wavelength-dependent trapping force, which should allow for the optimization of optical tweezers systems, simply by choosing the best trapping wavelength for a given application. Here we present an optical tweezer system with wavelength tunability, for the study of resonance effects. With this system, the optical trap stiffness is measured for single trapped particles that exhibit either single or multiple extinction resonances. We include discussions of wavelength-dependent effects, such as changes in temperature, and how to measure them.

Original languageEnglish (US)
Pages (from-to)043114
JournalReview of Scientific Instruments
Issue number4
StatePublished - Apr 2012


  • Calibration
  • Optical Tweezers
  • Temperature
  • Viscosity
  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.


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