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Intracellular Dielectric Tagging for Improved Optical Manipulation of Mammalian Cells

Research output: Contribution to journalArticlepeer-review

Abstract

Optical micromanipulation of transparent microparticles such as cellular materials relies upon the application of optical forces that are crucially dependent on the refractive index contrast between the particle and the surrounding medium. We briefly review the application of optical forces for cell manipulation and sorting, highlighting some of the key experiments over the last twenty years. We then introduce a new technique for enhancing the dielectric contrast of mammalian cells, which is a result of cells naturally taking up microspheres from their environment. We explore how these intracellular dielectric tags can influence the scattering and gradient forces upon these cells from an externally applied optical field. We show that intracellular polymer microspheres can serve as highly directional optical scatterers and that scattering forces can enable sorting through axial guiding onto laminin-coated glass coverslips upon which the selected cells adhere. Such internal dielectric tagging presents a simple, inexpensive, sterile technique to enhance optical manipulation procedures for cellular material and may enable new sorting techniques within microfluidic systems.

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Original languageEnglish
Pages (from-to)608-618
Number of pages11
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume16
Issue number3
DOIs
Publication statusPublished - 2010

    Research areas

  • Intracellular dielectric tagging, optical cell sorting and axial and scattering forces, RED-BLOOD-CELLS, SINGLE CELLS, TRAPPING EFFICIENCY, ESCHERICHIA-COLI, HIGH-RESOLUTION, LIGHT FIELDS, LASER TRAP, TWEEZERS, PARTICLES, SEPARATION

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