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Proceedings Paper

Quasi-Bessel hollow beam as optical guide for micro-particles
Author(s): Li Li; Niko Eckerskorn; Richard A. Kirian; Jochen Kuper; Daniel P. DePonte; W. Krolikowski; W. M. Lee; Henry N. Chapman; Andrei V. Rode
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Paper Abstract

We have developed a high-aspect ratio optical pipeline aiming to produce a highly collimated stream of micron-size particles in either gaseous or vacuum environments. A hollow, first-order quasi-Bessel beam with variable divergence was generated with a phase-only spatial light modulator (SLM), by superimposing the quadratic phase of a lens and an axicon with a 0.5° base angle. The beam was further re-imaged to form a centimetre-long funnel beam with ~5μm diameter and up to 2000 length-to-diameter aspect ratio. The divergence of the central core of the Bessel beam was controlled by varying the effective lens in the hologram. The SLM-based optical beam was compared to a similar beam composed using a physical axicon. The experimental tests were conducted with 2-μm size polystyrene spherical particles to evaluate the optical force. We present estimated optical forces exerted on the particles in the transverse plane, both depending on the particle size, laser power, and background-gas pressure.

Paper Details

Date Published: 12 September 2013
PDF: 11 pages
Proc. SPIE 8810, Optical Trapping and Optical Micromanipulation X, 88100N (12 September 2013); doi: 10.1117/12.2026654
Show Author Affiliations
Li Li, The Australian National Univ. (Australia)
Sun Yat-Sen Univ. (China)
Niko Eckerskorn, Australian National Univ. (Australia)
Richard A. Kirian, Ctr. for Free-Electron Laser Science, DESY (Germany)
Jochen Kuper, Deutsches Elektronen-Synchrotron (Germany)
Univ. Hamburg (Germany)
Daniel P. DePonte, Ctr. for Free-Electron Laser Science, DESY (Germany)
W. Krolikowski, Australian National Univ. (Australia)
W. M. Lee, Australian National Univ. (Australia)
Henry N. Chapman, Ctr. for Free-Electron Laser Science, DESY (Germany)
Univ. of Hamburg (Germany)
The Hamburg Ctr. for Ultrafast Imaging (Germany)
Andrei V. Rode, Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 8810:
Optical Trapping and Optical Micromanipulation X
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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