Varifocal zoom imaging with large area focal length adjustable metalenses
Varifocal zoom imaging with large area focal length adjustable metalenses
复制标题
DOI：
10.1364/optica.5.000825
复制
发表时间：
2018-07-20
期刊：
影响因子：
10.4
通讯作者：
Majumdar, Arka
中科院分区：
文献类型：
--
作者：
Colburn, Shane;Zhan, Alan;Majumdar, Arka
变焦镜头是动态光学系统的重要组成部分，应用于摄影，混合现实和显微镜。超表面光学器件具有用于创建可调谐平面光学器件的强大潜力。然而，现有的可调谐超透镜通常需要微机电致动器，其不能缩放到大面积器件，或者依赖于高电压来拉伸柔性衬底并实现足够的调谐范围。在这里，我们建立了一个1厘米孔径变焦超透镜系统在1550 nm波长的启发阿尔瓦雷斯透镜，使用高通量步进光刻制造。我们展示了通过最小限度地横向驱动两个立方相位超颖表面来实现焦距的非线性变化，聚焦效率高达57%，宽焦距变化超过6 cm（>200%）。我们还在可见光波段测试了透镜设计，并在成像路径中不使用任何其他光学元件的情况下，以经验证的4倍变焦能力进行变焦成像。（C）2018年美国光学学会根据OSA开放获取出版协议的条款
Varifocal lenses are essential components of dynamic optical systems with applications in photography, mixed reality, and microscopy. Metasurface optics has strong potential for creating tunable flat optics. Existing tunable metalenses, however, typically require microelectromechanical actuators, which cannot be scaled to large area devices, or rely on high voltages to stretch a flexible substrate and achieve a sufficient tuning range. Here, we build a 1 cm aperture varifocal metalens system at 1550 nm wavelength inspired by an Alvarez lens, fabricated using high-throughput stepper photolithography. We demonstrate a nonlinear change in focal length by minimally actuating two cubic phase metasurfaces laterally, with focusing efficiency as high as 57% and a wide focal length change of more than 6 cm (>200%). We also test a lens design at visible wavelength and conduct varifocal zoom imaging with a demonstrated 4x zoom capability without any other optical elements in the imaging path. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement