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Parasitic filtering in position detection systems for optical tweezers

Publication ,  Conference
Berg-Sørensen, K; Peterman, EJG; Oddershede, L; Van Dijk, M; Florin, EL; Schmidt, CF; Flyvbjerg, H
Published in: Proceedings of SPIE - The International Society for Optical Engineering
December 1, 2004

In a typical position detection system for optical tweezers, laser light impinges on a quadrant photodiode, and the signal from the four quadrants of the diode is used to determine the position of a trapped object. A widely used position detection system consists of a Si-PIN photodiode and an infrared laser. In previous work we have demonstrated with two distinct experimental methods how such a system may act as an unintended low-pass filter and we modeled its physical origin mathematically. Here we demonstrate that the general solution to this model can account precisely for the "parasitic" filter's effects up to as large frequencies as we can measure, approximately 100 kHz. Thus we increase the useful bandwidth of tweezers experiments by nearly two decades. This opens for investigations of phenomena in biophysics, soft matter, and polymer science at much higher frequencies than before.

Duke Scholars

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

December 1, 2004

Volume

5514

Start / End Page

419 / 427
 

Citation

APA
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Berg-Sørensen, K., Peterman, E. J. G., Oddershede, L., Van Dijk, M., Florin, E. L., Schmidt, C. F., & Flyvbjerg, H. (2004). Parasitic filtering in position detection systems for optical tweezers. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 5514, pp. 419–427). https://doi.org/10.1117/12.559582
Berg-Sørensen, K., E. J. G. Peterman, L. Oddershede, M. Van Dijk, E. L. Florin, C. F. Schmidt, and H. Flyvbjerg. “Parasitic filtering in position detection systems for optical tweezers.” In Proceedings of SPIE - The International Society for Optical Engineering, 5514:419–27, 2004. https://doi.org/10.1117/12.559582.
Berg-Sørensen K, Peterman EJG, Oddershede L, Van Dijk M, Florin EL, Schmidt CF, et al. Parasitic filtering in position detection systems for optical tweezers. In: Proceedings of SPIE - The International Society for Optical Engineering. 2004. p. 419–27.
Berg-Sørensen, K., et al. “Parasitic filtering in position detection systems for optical tweezers.” Proceedings of SPIE - The International Society for Optical Engineering, vol. 5514, 2004, pp. 419–27. Scopus, doi:10.1117/12.559582.
Berg-Sørensen K, Peterman EJG, Oddershede L, Van Dijk M, Florin EL, Schmidt CF, Flyvbjerg H. Parasitic filtering in position detection systems for optical tweezers. Proceedings of SPIE - The International Society for Optical Engineering. 2004. p. 419–427.

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

December 1, 2004

Volume

5514

Start / End Page

419 / 427