Light-induced dielectrophoretic manipulation of DNA

Marco Hoeb, Joachim O. Rädler, Stefan Klein, Martin Stutzmann, Martin S. Brandt

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


Light-induced dielectrophoretic movement of polystyrene beads and λ-DNA is studied using thin films of amorphous hydrogenated silicon as local photoaddressable electrodes with a diameter of 4 μm. Positive (high-field seeking) dielectrophoretic movement is observed for both types of objects. The absence of strong negative (low-field seeking) dielectrophoresis of DNA at high frequencies is in agreement with the similarity of the dielectric constants of DNA and water, the real part of the dielectric function. The corresponding imaginary part of the dielectric function governed by the conductivity of DNA can be determined from a comparison of the frequency dependence of the dielectrophoretic drift velocity with the Clausius-Mossotti relation.

Original languageEnglish
Pages (from-to)1032-1038
Number of pages7
JournalBiophysical Journal
Issue number3
StatePublished - Aug 2007


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