Metalens Focusing the Co-/cross-polarized Lights in Longitudinal Direction

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• 作者：Wei Wang ; Zhongyi Guo ; Keya Zhou ; Lingling Ran ; Yongxuan Sun ; Fei Shen…
• 关键词：Metasurface ; Optical devices ; Phase modulation ; Metalens
• 刊名：Plasmonics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：12
• 期：1
• 页码：69-75
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Biotechnology; Nanotechnology; Biophysics and Biological Physics; Biochemistry, general;
• 出版者：Springer US
• ISSN：1557-1963
• 卷排序：12

文摘

Recently, metasurface has attracted lots of attentions because of its great capability in phase engineering for the transmitted cross-polarization light, and many functional optical elements have been designed and investigated. Commonly, the co-polarization and cross-polarization lights will coexist in the transmitted fields. Here, we propose a planar metalens composed of L-shaped nanoholes, which can focus an incident plane wave to two different focal spots in longitudinal direction for the co-polarized and cross-polarized transmitted lights respectively. In our design, the focal length of the transmitted cross-polarized lights can be tuned easily according to Fermat principle. Meanwhile, the focal length of the co-polarized transmitted lights can also be modulated by the ring number of the designed metalens. Because of the polarization-independent characteristic of the L-shaped nanoantenna, the designed planar metalens can also be suitable for both linear and circular polarized incident lights.