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Proceedings Paper

Discrete complex amplitude filter for ultra long optical tube
Author(s): Jiming Wang; Qingliang Liu; Youwen Liu; Weibin Chen; Qiwen Zhan
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Paper Abstract

We proposed a discrete complex amplitude filter to create a focused hollow field with ultra long depth of focus. As for a high numerical aperture lens (NA=0.95), the focused field in the focal region can be engineered into a field like a long "tube" with flat wall through manipulating the distribution of the transmitted amplitude and phase at the pupil plane. This complex amplitude filter at the pupil plane can be discretized into multiple annular zones with different radius, transmittances and phase delays. A focused tube field with long depth of focus(~9λ) has been created as an example through separating and averaging of the projected pupil radiation pattern of magnetic dipole array in the focal region. Imperfections of the designed filter will influence the quality of the generated optical tube field and tolerance deviation of the radius, transmittance and phase delay in each zone is discussed. For the optical trapping, this created tube field can expand the manipulated distance and increase the trapped particles' numbers.

Paper Details

Date Published: 9 September 2011
PDF: 9 pages
Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 809722 (9 September 2011); doi: 10.1117/12.893756
Show Author Affiliations
Jiming Wang, Nanjing Univ. of Aeronautics and Astronautics (China)
State Key Lab. of Transient Optics and Photonics (China)
Qingliang Liu, Nanjing Univ. of Aeronautics and Astronautics (China)
Youwen Liu, Nanjing Univ. of Aeronautics and Astronautics (China)
Weibin Chen, Univ. of Dayton (United States)
Qiwen Zhan, Univ. of Dayton (United States)

Published in SPIE Proceedings Vol. 8097:
Optical Trapping and Optical Micromanipulation VIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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