High bandwidth force estimation for optical tweezers

Hullas Sehgal, Tanuj Aggarwal, murti v salapaka

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

A prevalent mode of optical tweezers involves position clamping that regulates a constant position of a trapped bead. Traditional schemes employ the measured bead position in the open loop or the control signal in the position-clamp mode as an estimate of external force on the trapped bead. This article shows that traditional methods introduce fundamental limitations on bandwidth of the external force estimation. A method is presented that leads to an order of magnitude increase in the bandwidth of the external force estimation. Furthermore, a comprehensive modeling paradigm is introduced that facilitates estimation of forces on the bead.

Original languageEnglish (US)
Article number153114
JournalApplied Physics Letters
Volume94
Issue number15
DOIs
StatePublished - Apr 27 2009

Fingerprint Dive into the research topics of 'High bandwidth force estimation for optical tweezers'. Together they form a unique fingerprint.

Cite this