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Proceedings Paper

Optimization of aspheric geometric-phase lenses for improved field-of-view
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Paper Abstract

In optical thin-films and surfaces, geometric phase is utilized to control the phase beyond that possible through optical path differences. Geometric-phase lenses, which are significantly thinner than refractive lenses for the same numerical aperture (NA), most commonly use a spherical phase profile. This is especially effective for normally incident light, but like other thin lenses, the performance degrades noticeably for off-axis incidence and wider fields-of-view. In this study, we investigate whether or not various aspheric designs provide better off-axis performance. We simulate aspheric singlet and doublet liquid crystal geometric-phase lenses (24.5 mm diameter, 40 mm back focal length at 633 nm), aiming to optimize spot size performance at 0, 3, and 7 degrees field angles, using Zemax OpticStudio 16.5. By using Zernike fringe phase expansions, we find conditions which provide improved off-axis performance. We demonstrate improved performance of a compact lens system utilizing these polarization-dependent optics.

Paper Details

Date Published: 17 September 2018
PDF: 8 pages
Proc. SPIE 10743, Optical Modeling and Performance Predictions X, 1074305 (17 September 2018); doi: 10.1117/12.2322326
Show Author Affiliations
Kathryn J. Hornburg, North Carolina State Univ. (United States)
Xiao Xiang, North Carolina State Univ. (United States)
Michael W. Kudenov, North Carolina State Univ. (United States)
Michael J. Escuti, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 10743:
Optical Modeling and Performance Predictions X
Mark A. Kahan; Marie B. Levine-West, Editor(s)

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