Yi Deng et al 2007 J. Opt. A: Pure Appl. Opt. 9 S256 doi:10.1088/1464-4258/9/8/S20
Yi Deng, John Bechhoefer and Nancy R Forde
Show affiliationsMotivated by recent attempts to use parametric resonance to calibrate the spring constant of a Brownian particle in an optical trap, we have looked systematically at the effects of modulating laser power on the motion of the trapped particle. We predict and find experimentally an increase in the particle's position variance at low laser modulation frequencies, but we find no evidence for any resonant effects in the extremely overdamped motion of the trapped particle. Our results can serve as a guide for designing multiple traps by the 'time-sharing' method.
37.10.Vz Mechanical effects of light on atoms, molecules, and ions
Issue 8 (August 2007)
Received 27 December 2006, accepted for publication 26 January 2007
Published 25 July 2007
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