Thermally activated state transition technique for femto-Newton-level force measurement

Feng Jung Chen, Jhih Sian Wong, Ken-Yuh Hsu, Long Hsu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We develop and test a thermally activated state transition technique for ultraweak force measurement. As a force sensor, the technique was demonstrated on a classical Brownian bead immersed in water and restrained by a bistable optical trap. A femto-Newton-level flow force imposed on this sensor was measured by monitoring changes in the transition rates of the bead hopping between two energy states. The treatment of thermal disturbances as a requirement instead of a limiting factor is the major feature of the technique, and provides a new strategy by which to measure other ultraweak forces beyond the thermal noise limit.

Original languageEnglish
Pages (from-to)1469-1471
Number of pages3
JournalOptics Letters
Volume37
Issue number9
DOIs
StatePublished - 1 May 2012

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