- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Graded-Index Fluoropolymer Antireflection Coatings for Invisible Plastic Optics
摘要： Plastic optics are used in an ever-expanding range of applications and yet a durable, high performance antireflection (AR) coating remains elusive for this material class. Here, we introduce a sacrificial porogen approach to produce ultralow refractive index nanoporous fluoropolymer AR coatings via thermal co-evaporation of Teflon AF and the small molecule N,N′-Bis(3-methylphenyl)-N,N′-diphenylbenzidine (NPD). Using this approach, we demonstrate a five-layer, step-graded AR coating that reduces the solar spectrum-averaged (400 < λ < 2000 nm) reflectance of acrylic plastic to <0.5% for incidence angles up to 40° and withstands over three months of outdoor rooftop exposure with minimal degradation. A trilayer coating optimized for the visible range yields luminous reflectivity down to ~0.1%, effectively rendering double-side coated acrylic plastic invisible under room lighting conditions. Strong adhesion to most optical plastics, an outstanding combination of mechanical, chemical, and environmental durability, and compatibility with commercial vacuum coating systems should enable this AR technology to find widespread practical use.
关键词： gradient-index,polymer optics,sacrificial porogen,antireflection,nanoporous
更新于2025-09-23 15:23:52
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Fabrication of curved diffractive optical elements by means of laser direct writing, electroplating, and injection compression molding
摘要： In this work, a new process chain for the fabrication of curved micro-structured optical elements by injection compression molding is investigated. The fabrication is demonstrated for the example of a curved di?ractive optical element (DOE). In a ?rst process step a master substrate is fabricated using laser direct writing on a curved glass substrate. Blazed di?ractive micro-structures with lateral feature sizes down to 5 μm and height of 1.6 μm are created. A subsequent electroplating process is applied to create a nickel stamper to be used as a tool insert for the molding process. During electroplating, a 3 mm nickel layer is formed, transferring the di?ractive structures from the master substrate into a solid mold insert. The nickel stamper shows an accurate reproduction of the micro-structures. The mold insert is integrated into an injection compression molding tool to replicate the optical elements. Results show that the blazed di?ractive structures are replicated with a high quality. Tests of the components within a chromatic-confocal measurement setup con?rm that they can potentially replace expensive conventional elements.
关键词： Polymer optics,Injection compression molding,Laser direct writing,Di?ractive optical element
更新于2025-09-19 17:13:59