Zhang Jianchao, Sun Qian, Wang Zhengyang, Zhang Guangyong, Liu Yikun, Liu Jin, Martins Emiliano R, Krauss Thomas F, Liang Haowen, Li Juntao, Wang Xue-Hua
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
Hisense Laser Display Co., Ltd., 399 Songling Road, Qingdao, Shandong 266100, China.
Nano Lett. 2024 Apr 3. doi: 10.1021/acs.nanolett.4c00328.
Metalenses are typically designed for a fixed focal length, restricting their functionality to static scenarios. Various methods have been introduced to achieve the zoom function in metalenses. These methods, however, have a very limited zoom range, or they require additional lenses to achieve direct imaging. Here, we demonstrate a zoom metalens based on axial movement that performs both the imaging and the zoom function. The key innovation is the use of a polynomial phase profile that mimics an aspheric lens, which allows an extended depth of focus, enabling a large zoom range. Experimental results show that this focal length variation, combined with the extended depth of focus, translates into an impressive zoom range of 11.9× while maintaining good imaging quality. We see applications for such a zoom metalens in surveillance cameras of drones or microrobots to reduce their weight and volume, thus enabling more flexible application scenarios.
超构透镜通常设计为具有固定焦距，其功能局限于静态场景。已经引入了各种方法来实现超构透镜的变焦功能。然而，这些方法的变焦范围非常有限，或者需要额外的透镜来实现直接成像。在此，我们展示了一种基于轴向移动的变焦超构透镜，它兼具成像和变焦功能。关键创新在于使用了模仿非球面透镜的多项式相位轮廓，这允许扩展焦深，从而实现大的变焦范围。实验结果表明，这种焦距变化与扩展的焦深相结合，在保持良好成像质量的同时，转化为令人印象深刻的11.9倍变焦范围。我们认为这种变焦超构透镜可应用于无人机或微型机器人的监控摄像头，以减轻其重量和体积，从而实现更灵活的应用场景。
