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Title: Design and fabrication of composite polygonal Fresnel lenses
Authors: Yew Jin, Nicholas Tan
Lim, Zi Heng 
Zhou, Guangya 
Liu, Kui
Senthil Kumar A. 
Issue Date: 13-Aug-2021
Publisher: The Optical Society
Citation: Yew Jin, Nicholas Tan, Lim, Zi Heng, Zhou, Guangya, Liu, Kui, Senthil Kumar A. (2021-08-13). Design and fabrication of composite polygonal Fresnel lenses. Optics Express 29 (22) : 36516-36534. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: High fill factor for Fresnel lens arrays has been achieved with the aid of polygonal lenses. This has been done for both circular trimmed lenses and full polygonal lenses, both of which present some optical drawbacks. The composite polygonal Fresnel lens (CPFL) avoids these issues with its unique design – a radial symmetric Fresnel center filling into a polygon, avoiding any intersecting facets within the lens by introducing fillets. To manufacture the CPFL, diamond shaping is applied to not only meet the strict standards required for optical fabrication but also maneuver around the curvilinear features that cannot be fabricated using conventional turning techniques. As such, direct diamond shaping (DDS) was employed to generate an array of CPFLs on a PMMA substrate. Optical simulation was used to validate the performance of the CPFL before production of the lens array, followed by testing of the fabricated lenses, showing less overall noise with better focus compared to conventional polygonal lenses. © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Source Title: Optics Express
ISSN: 1094-4087
DOI: 10.1364/oe.436290
Rights: Attribution 4.0 International
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