Conventional IR lenses, typically refractive lenses, composed of inorganic semiconductors or chalcogenide glasses, are usually bulky, heavy, and difficult processable. Here, a one-step photo-curing imprinting strategy is presented to fabricate lightweight, compact, and high refractive index (HRI) hybrid Fresnel lenses for optical devices based on thiol-ene/-yne reactions. The hybrid Fresnel lenses consist of two layers: the silicon/quartz as the support substrate and HRI polymer films as functional layer which are synthesized by thiol-ene/-yne reactions with high sulfur-content comonomers 2,3-bis((2-mercaptoethyl)thio)-1-propanethiol (BMETP) and its derivatives. The as-prepared photopolymer films exhibit excellent transparency properties and HRI above 1.62 both in the visible and infrared regions, resulting from the large ratio of sulfur element with high molar refraction. A series of images captured by vis-IR hybrid Fresnel lenses are demonstrated to confirm the applicability in the area of the optical imaging technique. This strategy, based on the one-step photo-curing imprinting, integrating the advantages of the easy processability of organic polymers and high dimensional stability of the inorganic substrate materials, provides a facile, processable, and highly efficient process for fabricating lightweight optical lenses.

中文翻译：

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具有高折射率的光固化 Vis-IR 混合菲涅耳透镜

传统的红外透镜，通常是折射透镜，由无机半导体或硫属化物玻璃组成，通常体积大、重且难以加工。在这里，提出了一种一步光固化压印策略，用于制造基于硫醇-烯/炔反应的光学器件的轻型、紧凑和高折射率 (HRI) 混合菲涅耳透镜。混合菲涅尔透镜由两层组成：作为支撑基底的硅/石英和作为功能层的 HRI 聚合物薄膜，它们是通过硫醇-烯/炔与高硫含量共聚单体 2,3-双((2-巯基乙基)硫)-1-丙硫醇 (BMETP) 及其衍生物。所制备的光聚合物薄膜在可见光和红外区域均表现出优异的透明度和高于 1.62 的 HRI，由于硫元素的比例大，具有高摩尔折射。展示了一系列由可见红外混合菲涅耳透镜捕获的图像，以确认其在光学成像技术领域的适用性。这种基于一步光固化压印的策略，结合了有机聚合物的易加工性和无机基材材料的高尺寸稳定性的优点，为制造轻量级光学镜片提供了一种简便、可加工和高效的工艺。