Dual-trap technique for reduction of low-frequency noise in force measuring optical tweezers
2007 (English)In: Applied Optics, ISSN 0003-6935, Vol. 46, no 3, 405-412 p.Article in journal (Refereed) Published
High-resolution long-time force measurements by optical tweezers are often limited by low- frequency (1/f) noise. A dual-trap technique is presented that can reduce such noise in the force signal. It incorporates a second trap (a reference trap) that probes the noise in the system and it is based upon the assumption that the low-frequency parts of the noise from the two traps are correlated. A subtraction of the low-frequency signal from the reference trap from the signal from the force measuring trap will therefore yield a net signal that is significantly less influenced by noise. It is shown that this dual-trap technique can reduce the noise in the force signal up to 60% depending on detection bandwidth.
Place, publisher, year, edition, pages
2007. Vol. 46, no 3, 405-412 p.
IdentifiersURN: urn:nbn:se:umu:diva-2748DOI: 10.1364/AO.46.000405OAI: oai:DiVA.org:umu-2748DiVA: diva2:141007