Optimal trapping stability of Escherichia coli in oscillating optical tweezers

Amarjeet Yadav, Anindita Dutta, Pramod Kumar, Yuval Dahan, Alexander Aranovich, Mario Feingold

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Single-beam oscillating optical tweezers can be used to trap rod-shaped bacterial cells and align them with their long axis lying within the focal plane. While such configuration is useful for imaging applications, the corresponding imaging resolution is limited by the fluctuations of the trapped cell. We study the fluctuations of four of the coordinates of the trapped cell, two for its center of mass position and two for its angular orientation, showing the way they depend on the trap length and the trapping beam power. We find that optimal trapping stability is obtained when the trap length is about the same as the cell length and that cell fluctuations in the focal plane decrease like the inverse of the trapping power.

Original languageEnglish
Article number062402
JournalPhysical Review E
Issue number6
StatePublished - 1 Jun 2020

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics


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