Three-dimensional holographic optical tweezers implemented on spatial light modulator

Enrico Ferrari*, Dan Cojoc, Valentina Emiliani, Valeria Garbin, Malté Coppey-Moisan, Enzo Di Fabrizio

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


We have developed a holographic optical tweezers system based on diffractive optical elements (DOEs) implemented on a liquid crystal spatial light modulator (LC-SLM) able to generate fine positioned traps on the sample. Our own algorithms and cede allows to calculate phase DOEs that can transform a single laser beam into an array of independent traps, each with individually specified characteristics, arranged in arbitrary three-dimensional (3D) geometrical configurations. Different DOEs can be dynamically projected to the SLM in order to achieve a rearrangement of the configuration of the trapping spots. Silica or latex micro-beads are trapped hi different configurations of spots to demonstrate the fine control capability on each trap. Our setup is built on a standard video microscope coupled with a laser source, a spatial light modulator and a three axis nano-positioning system. It allows to obtain 3D multi-trapping and a fine calibration for the positioning of the traps.

Original languageEnglish (US)
Article number597203
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
Externally publishedYes
EventAdvanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies II - Bucharest, Romania
Duration: Nov 24 2004Nov 26 2004


  • Diffractive optical elements
  • Liquid crystal spatial light modulator
  • Optical tweezers

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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