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Design, fabrication, and evaluation of a multilevel spiral-phase Fresnel zone plate for optical trapping

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Abstract

A compact optics configuration for the generation of donut beams for trapping atoms at the micrometer scale using a multilevel spiral-phase Fresnel zone plate (FZP) and a semiconductor laser is proposed. A FZP is designed and a multilevel spiral phase is integrated into it. A spiral-phase FZP with a radius of 1 mm and with more than 1300 half-period zones is designed with multiple angular levels for integer and fractional topological charges, and the device is fabricated using electron-beam lithography direct writing. The performance of the device is evaluated, and the generation of symmetric and asymmetric donut beams is successfully demonstrated.

© 2012 Optical Society of America

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Corrections

A. Vijaykumar and Shanti Bhattacharya, "Design, fabrication, and evaluation of a multilevel spiral-phase Fresnel zone plate for optical trapping: Erratum," Appl. Opt. 52, 1148-1148 (2013)
https://opg.optica.org/ao/abstract.cfm?uri=ao-52-6-1148

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