Trapping of low-index microparticles in an optical vortex
نویسنده
چکیده
The equilibrium position of a low-index particle in an optical-vortex trap was experimentally measured for two different systems: a buoyant hollow glass sphere in water and a density-matched water droplet in acetophenone. Vortex traps are the only known static, single-beam configurations allowing three-dimensional trapping of such particles in the size range of 2–50 mm. The trap consists of a strongly focused Gaussian laser beam containing a holographically produced optical vortex. Using experimental and theoretical techniques, we also explored changes in the trapping efficiency owing to the vortex core size, the relative refractive index, and the numerical aperture of the focusing objective. © 1998 Optical Society of America [S0740-3224(98)03802-8] OCIS codes: 350.3950, 080.0080.
منابع مشابه
Simultaneous trapping of low-index and high-index microparticles observed with an optical-vortex trap
We report the first observation of the simultaneous three-dimensional confinement of both a low-index particle and a high-index particle within a single-beam optical trap by using a strongly focused laser beam containing an optical vortex. Experimental and theoretical investigations of the trap stability are described. © 1999 Optical Society of America [S0740-3224(99)00904-2] OCIS codes: 140.70...
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