We demonstrate three-dimensional trapping of low-index particles (20-μm-diameter hollow glass spheres in water) by using a single, strongly focused, stationary dark optical vortex laser beam. The holographically generated vortex, which is similar to a ${\text{TEM}}_{01}^{*}$ mode beam, was also used to trap and form ring patterns of high-index particles.

© 1996 Optical Society of America

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