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Proceedings Paper

Formation of three-dimensional spatial patterns of glass particles using a single-beam gradient-force optical trap in air
Author(s): Ryota Omori; Atsuyuki Suzuki
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Paper Abstract

Laser manipulation is a technique to confine and manipulate microscopic objects remotely using radiation pressure of a laser beam. Recently, a single-beam gradient-force optical trap, which relies solely on the radiation pressure of a tightly focused laser beam, was demonstrated in air. In this paper we report the formation of spatial patterns consisting of glass particles of d equals 5.0 micrometers in air using the technique. Once a particle was trapped, we transferred it by moving the focus of the objective lens and the microscopic stage and put it to other particles or the surface of the glass plate. We formed spatial patterns of particles by repeating this procedure. Because the attractive force between neighboring particles in the spatial patterns are much greater than the gravitational force acting on particles, observed 3D spatial patterns were very stable. The transfer of trapped particles was generally easier in air than in water because of low viscosity of air. Moreover, in this type of trap, we can improve the stability of the trap by increasing the laser power. It is expected that the present technique will be applied in various fields including microfabrication and micromachine.

Paper Details

Date Published: 18 August 1997
PDF: 7 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281136
Show Author Affiliations
Ryota Omori, Univ. of Tokyo (Japan)
Atsuyuki Suzuki, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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