Force trapping gradient using diffractive optical elements

R. Moradi*, E. Ferrari, V. Garbin, Enzo Di Fabrizio, D. Cojoc

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We discuss a new technique to generate force gradient in arrays of optical traps. The arrays can be configured in two or three dimensions by means of phase diffractive optical elements displayed on a spatial light modulator. The design of the diffractive optical elements is based on the approach of spherical wave propagation and superposition, which enables to individually control the strength of each optical trap. Computer simulation and experimental results are discussed for two and three dimensional arrays of traps. An example with silica micro-beads trapped with different forces in two different planes is presented to demonstrate the validity of our approach.

Original languageEnglish (US)
Title of host publicationOptical Trapping and Optical Micromanipulation III
StatePublished - Dec 1 2006
EventOptical Trapping and Optical Micromanipulation III - San Diego, CA, United States
Duration: Aug 13 2006Aug 17 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptical Trapping and Optical Micromanipulation III
Country/TerritoryUnited States
CitySan Diego, CA


  • Force gradient
  • Optical trapping
  • Phase diffractive optical elements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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