Scanning line optical tweezers are a powerful tool for the study of colloidal or biomolecular systems in the low-force regime. We present a fast, high-resolution particle position measurement scheme that extends the capabilities of these instruments into the realm of dynamic measurements. The technique is based on synchronous detection of forward-scattered laser light during a line scan. We demonstrate a position resolution of better than 50 nm for bandwidths of as much as 40 kHz for pairs of microspheres trapped in a flat line potential at center-to-center separations of .
© 2002 Optical Society of AmericaFull Article | PDF Article
B. Agate, C. T. A. Brown, W. Sibbett, and K. Dholakia
Opt. Express 12(13) 3011-3017 (2004)
Peng Li, Kebin Shi, and Zhiwen Liu
Opt. Lett. 30(2) 156-158 (2005)
Katrina Y. T. Seet, Robert Vogel, Timo A. Nieminen, Gregor Knöner, Halina Rubinsztein-Dunlop, Matt Trau, and Andrei V. Zvyagin
Appl. Opt. 46(9) 1554-1561 (2007)