3D micromanipulation at low numerical aperture with a single light beam: the focused-Bessel trap

Full-three-dimensional (3D) manipulation of individual glass beads with radii in the range of 2-8 μm is experimentally demonstrated by using a single Bessel light beam focused through a low-numerical-aperture lens (NA=0.40). Although we have a weight-assisted trap with the beam propagating upward, w...

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Bibliographic Details
Published in:Optics letters 2016-02, Vol.41 (3), p.614-617
Main Authors: Ayala, Yareni A, Arzola, Alejandro V, Volke-Sepúlveda, Karen
Format: Article
Language:English
Subjects:
Aberration
Beads
Beams (radiation)
Light beams
Micromanipulation
Particle beams
Trapping
Walls
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Summary:Full-three-dimensional (3D) manipulation of individual glass beads with radii in the range of 2-8 μm is experimentally demonstrated by using a single Bessel light beam focused through a low-numerical-aperture lens (NA=0.40). Although we have a weight-assisted trap with the beam propagating upward, we obtain a stable equilibrium position well away from the walls of the sample cell, and we are able to move the particle across the entire cell in three dimensions. A theoretical analysis for the optical field and trapping forces along the lateral and axial directions is presented for the focused-Bessel trap. This trap offers advantages for 3D manipulation, such as an extended working distance, a large field of view, and reduced aberrations.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.41.000614