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Optica Publishing Group
  • International Quantum Electronics Conference
  • 1996 OSA Technical Digest Series (Optica Publishing Group, 1996),
  • paper TuC7

Vortex traps

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Abstract

The development of the single-beam gradient force radiation pressure trap for microscopic dielectric particles has led to a range of biomedical and related applications [1-5]. However, the conventional gradient force trap for high-index particles (np> n0) has some limitations. For example, trapped particles are susceptible to optical damage via absorptive heating because the centre of the trap is in the high intensity focal region. Also, multiple particles may be attracted into the same trap; thus, isolating a single particle requires dilute samples. What is more, it is difficult to trap low-index particles using a conventional gradient force trap. To circumvent these limitations, various schemes have been proposed [6-8].

© 1996 Optical Society of America

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