Journal
OPTICS EXPRESS
Volume 27, Issue 3, Pages 3439-3447Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.003439
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Funding
- National Research Foundation of Korea (NRF) [2016R1A2B4013640]
- Commercializations Promotion Agency for RD Outcomes [2018000145]
- National Research Foundation of Korea [2016R1A2B4013640] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Generally, the fabrication of curved structures such as microlens arrays has been regarded as an expensive and complicated process. Here, we propose a facile method to form a microlens array with controlled lens curvature by combining residue-free nanoimprint lithography (NIL) with V-shaped molds and the successive thermal reflow procedure of the printed polymeric structures. The V-shaped molds used in this study enable the bottom substrate to be exposed after the NIL process when the initial thickness is controlled. Then, we use the thermal reflow to realize hemi-cylindrical curved lenses by applying heat. The polymers are self-pinned on the exposed substrate, which is strong enough to fix the boundary to not dewet or be flattened in the broad temperature range of the reflow process, which is essential for a large-area fabrication. Furthermore, we demonstrate the modulation of the focal lengths of the lenses by controlling the initial polymer thickness coated on a substrate. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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