Metalenses on a flexible template are engineered metal‐dielectric interfaces that improve conventional imaging system and offer dynamic focusing and zooming capabilities by controlling the focal length and bandwidth through a mechanical or external stretch. However, realizing large‐scale and cost‐effective flexible metalenses with high yields in a strain‐multiplex fashion remains as a great challenge. Here, single‐pulsed, maskless light interference and imprinting technique is utilized to fabricate reconfigurable, flexible metalenses on a large‐scale and demonstrate its strain‐multiplex tunable focusing. Experiments, in accordance with the theory, show that applied stretch on the flexible‐template reconfigurable diffractive metalenses (FDMLs) accurately mapped focused wavefront, bandwidth, and focal length. The surface relief metastructures consisted of metal‐coated hemispherical cavities in a hexagonal close‐packed arrangement to enhance tunable focal length, numerical aperture, and fill factor, FF ≈ 100% through normal and angular light illumination with external stretch. The strain‐multiplex of FDMLs approach lays the foundation of a new class of large‐scale, cost‐effective metalens offering tunable light focusing and imaging.

中文翻译：

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应变多金属元阵列，用于可调焦和成像

柔性模板上的Metalense是经过工程设计的金属介电接口，可改善常规成像系统，并通过机械或外部拉伸来控制焦距和带宽，从而提供动态聚焦和缩放功能。然而，以应变多路复用的方式实现高产量的大规模，低成本的柔性金属传感器仍然是一个巨大的挑战。在这里，单脉冲，无掩模的光干涉和压印技术被用于大规模地制造可重构的，灵活的金属镜，并展示其应变多重可调聚焦。根据该理论的实验表明，在柔性模板可重配置衍射金属感测器（FDML）上应用拉伸可以准确地绘制聚焦波前，带宽和焦距。表面起伏结构由六边形密排布置的金属涂层半球形腔组成，可通过使用外部拉伸的法向和角度光照增强可调节的焦距，数值孔径和填充系数FF≈100％。FDMLs方法的应变多路复用为提供可调光聚焦和成像功能的新型，大规模，经济高效的金属粉奠定了基础。