High contrast pattern reconstructions using a phase-seeded point CGH method

McWilliam, Richard; Williams, Gavin; Cowling, Joshua; Seed, Luke; Purvis, Alan

Abstract

A major challenge encountered in digital holography applications is the need to synthesize computer-generated holograms (CGHs) that are realizable as phase-only elements while also delivering high quality reconstruction. This trade-off is particularly acute in high-precision applications such as photolithography where contrast typically must exceed 0.6. A seeded-phase point method is proposed to address this challenge, whereby patterns composed of fine lines that intersect and form closed shapes are reconstructed with high contrast while maintaining a phase-only CGH. The method achieves superior contrast to that obtained by uniform or random seeded-phase methods while maintaining computational efficiency for large area exposures. It is also shown that binary phase modulation achieves similar contrast performance with benefits for the fabrication of simpler diffractive optical elements.

Citation

McWilliam, R., Williams, G., Cowling, J., Seed, L., & Purvis, A. (2016). High contrast pattern reconstructions using a phase-seeded point CGH method. Applied Optics, 55(7), 1701-1710. https://doi.org/10.1364/ao.55.001701

• Journal Article Type: Article
• Acceptance Date: Jan 21, 2016
• Online Publication Date: Feb 26, 2016
• Publication Date: Feb 26, 2016
• Deposit Date: Jan 29, 2016
• Publicly Available Date: Feb 29, 2016
• Journal: Applied Optics
• Print ISSN: 1559-128X
• Electronic ISSN: 2155-3165
• Publisher: Optica
• Peer Reviewed: Peer Reviewed
• Volume: 55
• Issue: 7
• Pages: 1701-1710
• DOI: https://doi.org/10.1364/ao.55.001701
• Public URL: https://durham-repository.worktribe.com/output/1421533
• Related Public URLs: https://www.osapublishing.org/ao/upcoming.cfm