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Brownian Particle in an Optical Potential of the Washboard Type

2003; American Physical Society; Volume: 91; Issue: 3 Linguagem: Inglês

10.1103/physrevlett.91.038101

1092-0145

Svetlana A. Tatarkova, Wilson Sibbett, Kishan Dholakia,

Spectroscopy and Quantum Chemical Studies

Experimental observations of the fluctuation-driven net transport of silica microspheres are presented in a two-dimensional optical potential of circular symmetry created by a Bessel light beam. The optical field is tailored to break symmetry and create a static tilted periodic (washboard) potential. As the tilt of potential exceeds a threshold, a transition between locked and running modes is observed. The running mode manifests itself by the rapid accumulation of particles at the beam center.