Parasitic filtering in position detection systems for optical tweezers

Kirstine Berg-Sorensen; Erwin J. G. Peterman; Lene Broeng Oddershede; Meindert van Dijk; Ernst-Ludwig Florin; Christoph F. Schmidt; Henrik Flyvbjerg

doi:10.1117/12.559582

18 October 2004 Parasitic filtering in position detection systems for optical tweezers

Kirstine Berg-Sorensen, Erwin J. G. Peterman, Lene Broeng Oddershede, Meindert van Dijk, Ernst-Ludwig Florin, Christoph F. Schmidt, Henrik Flyvbjerg

Author Affiliations +

Proceedings Volume 5514, Optical Trapping and Optical Micromanipulation; (2004) https://doi.org/10.1117/12.559582
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

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.

Citation Download Citation

Kirstine Berg-Sorensen, Erwin J. G. Peterman, Lene Broeng Oddershede, Meindert van Dijk, Ernst-Ludwig Florin, Christoph F. Schmidt, and Henrik Flyvbjerg "Parasitic filtering in position detection systems for optical tweezers", Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); https://doi.org/10.1117/12.559582

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available