| 关于超透镜斜入射时调制传递函数曲线的研究 |
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| 引用本文： | 刘仕良,余彬彬,陈旭,文静. 关于超透镜斜入射时调制传递函数曲线的研究[J]. 光学仪器, 2020, 42(1): 52-57 |
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| 作者姓名： | 刘仕良 余彬彬 陈旭 文静 |
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| 作者单位： | 上海理工大学 光电信息与计算机工程学院, 上海 200093,上海理工大学 光电信息与计算机工程学院, 上海 200093,上海理工大学 光电信息与计算机工程学院, 上海 200093,上海理工大学 光电信息与计算机工程学院, 上海 200093 |
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| 基金项目： | 国家自然科学基金项目（81701745）；上海市科学技术委员会创新行动计划（16DZ1100303、18DZ1100400） |
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| 摘 要： | 为了实现光学系统的集成和小型化,提高光学系统的成像质量,设计了一种基于广义斯涅尔定律和几何相位的平面超透镜。通过在超透镜界面处设计双曲面相位分布,将入射圆偏振平面波阵面转换为球形波阵面,将光聚焦在期望焦距处,并且在垂直入射时能够实现衍射极限聚焦。分析了入射光以不同角度入射时,光斑的调制传递函数(MTF)曲线,阐述了不同角度入射光入射时导致MTF曲线下降的原因。该分析对平面超透镜的进一步优化设计具有一定的指导意义,有助于实现小型化、集成化的光学系统。
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| 关 键 词： | 超透镜 斜入射 调制传递函数(MTF) |
| 收稿时间： | 2019-01-04 |
Investigations of modulation transfer functions for oblique incidences on metalens |
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| LIU Shiliang,YU Binbin,CHEN Xu and WEN Jing. Investigations of modulation transfer functions for oblique incidences on metalens[J]. Optical Instruments, 2020, 42(1): 52-57 |
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| Authors: | LIU Shiliang YU Binbin CHEN Xu WEN Jing |
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| Affiliation: | School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China and School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | In order to realize integrations and miniaturizations of optical systems and improve optical imaging qualities of the systems, a planar metalens that based on generalized Snell''s law and geometric phase. The metalens converts an incident circularly polarized plane wave into a spherical wave by designing a hyperbolic phase distribution at the interface to focus the light at a desired focal length, which can achieve diffraction limited focusing when the light is at the normal incidence. The modulation transfer function (MTF) curve of the spot is further analyzed when the incident light is at different angles. Finally, the reason why the MTF curve is decreased at different incident angles is explained. This investigation has certain guiding significance for the further optimization design of the planar metalens, which contributes to the realization of miniaturized and integrated optical systems. |
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| Keywords: | metalens oblique incidence modulation transfer function |
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