Dual-layer achromatic metalens design with an effective Abbe number
Dual-layer achromatic metalens design with an effective Abbe number
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具有有效阿贝数的双层消色差超透镜设计
DOI：
10.1364/oe.402478
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发表时间：
2020-08-31
期刊：
影响因子：
3.8
通讯作者：
Chen, Rushan
中科院分区：
文献类型：
--
作者：
Li, Mengmeng;Li, Shuaishuai;Chen, Rushan
厚度为波长量级的平面消色差超透镜因其在超小型光学器件中的潜在应用而受到广泛关注。然而，在宽带宽上实现单层消色差超透镜需要相应的元原子具有复杂的横截面以用于正确的相位分布和色散补偿。本文引入有效阿贝数，利用透镜制造方程设计了一种双层消色差超透镜，该超透镜采用平凸类超透镜与平凹类超透镜相结合的方法来补偿色散。叠层超透镜的设计基于简单的高折射率介质圆柱形不同半径的元原子，简化了设计和制造过程。我们证明了双层消色差超透镜在可见光波长范围内具有很小的焦距差和超过50%的平均聚焦效率，这证明了该设计方法在多功能平板光学器件中的许多潜在应用是有希望的。(C)根据OSA开放获取出版协议的条款，2020年美国光学学会
Planar achromatic metalenses with a thickness of the order of wavelength have attracted much attention for their potential applications in ultra-compact optical devices. However, realizing single-layer achromatic metalenses across a wide bandwidth requires that the corresponding meta-atoms have complex cross-sections for correct phase profile and dispersion compensation. Herein, we introduce an effective Abbe number and use lens maker equations to design a dual-layer achromatic metalens in which we compensate the dispersion by using a plano-convex liked metalens combined with a plano-concave liked metalens. The stacked metalens are designed based on simple high refractive index dielectric cylindrical meta-atoms with different radii, which simplify the design and fabrication processes. We demonstrate that a dual-layer achromatic metalens has a small focal length difference across the visible wavelength range and an average focusing efficiency above 50%, which proves that the design method is promising for many potential applications in multi-functional flat optical devices. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement