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Fabrication of large-scale infrared diffractive lens arrays on chalcogenide glass by means of step-and-repeat hot imprinting and non-isothermal glass molding

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Abstract

In this study, a new cost-effective and high-precision process chain for the fabrication of large-scale infrared (IR) diffractive lens arrays on chalcogenide glass is proposed. First, a positive diffractive lens array is fabricated on a polymethylmethacrylate (PMMA) master substrate by employing a step-and-repeat hot imprinting process. The direct hot imprinting can transfer microstructures from a heated mold to the polymer substrate accurately. Repeating the hot imprinting process along a predetermined path, the desired diffractive lens array is obtained. Unlike photolithography and electron-beam writing, which are expensive technologies with sophisticated process steps, the hot imprinting is an easier, cheaper, and more eco-friendly method for fabricating diffractive features with continuous profile. Afterwards a casting process is applied to create a polydimethylsiloxane (PDMS) mold with negative features. The diffractive lens array is successfully transferred from the master substrate to the PDMS elastomer, which is used as a mold in subsequent precision glass molding. Finally, microstructures on the PDMS mold are replicated to the chalcogenide glass by non-isothermal glass molding. In this process, the PDMS mold and workpiece are set at different temperatures. Specifically the PDMS mold at low temperature maintains enough rigidity to press the features onto the softened chalcogenide glass, which is kept at a relatively higher temperature, resulting in a replica of high-fidelity diffractive lens array on the chalcogenide glass. Surface profiles and optical performance of the fabricated components are characterized quantitatively. Results showed that large-scale diffractive lens array can be successfully fabricated on chalcogenide glass by this proposed process chain with high quality and integrity.

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Acknowledgements

This material is partially based on work supported by the National Science Foundation under Grant No. 1537212. Yang Shu also gratefully acknowledges the financial support from the China Scholarship Council (CSC).

Funding

This material is partially based on work supported by the National Science Foundation under Grant No. 1537212 and financial support from the China Scholarship Council (CSC).

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Authors and Affiliations

  1. College of Mechanical and Vehicle Engineering, Hunan University, No. 2 Lushan South Rd., Yuelu District, Changsha, 410082, China

    Yang Shu & Zhixiong Zhou

  2. Department of Integrated Systems Engineering, The Ohio State University, 210 Baker Systems Building, 1971 Neil Avenue, Columbus, OH, 43210, USA

    Yang Shu, Tiantong Chen, Wenchen Zhou & Allen Y. Yi

Authors
  1. Yang Shu
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  2. Tiantong Chen
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  3. Wenchen Zhou
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  4. Zhixiong Zhou
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  5. Allen Y. Yi
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Correspondence to Allen Y. Yi.

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Shu, Y., Chen, T., Zhou, W. et al. Fabrication of large-scale infrared diffractive lens arrays on chalcogenide glass by means of step-and-repeat hot imprinting and non-isothermal glass molding. Int J Adv Manuf Technol 116, 3075–3085 (2021). https://doi.org/10.1007/s00170-021-07716-w

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  • DOI: https://doi.org/10.1007/s00170-021-07716-w

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