Home > Archive>Volume 18, Issue 2, 2022 >72-76. DOI:https://doi.org/10.1007/s11801-022-1095-9
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Focusing enhanced broadband metalens via height optimization
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Henan Key Laboratory of Laser and Opto-electric Information Technology, School of Information Engineering, Zhengzhou University, Zhengzhou 450001, China

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    Abstract:

    Metalenses are two-dimensional planar metamaterial lenses, which have the advantages of high efficiency and easy integration. Based on the method of spatial multiplexing, a metalens with a wide working waveband is designed by arranging TiO2 nanopillars under the resonance phase regulation. In addition, choosing an assistant metalens with optimized heights is effective to enhance metalens’s focusing, which is also illustrated in this paper. The metalens, designed with numerical aperture (NA) of 0.72 and center working wavelength of 600 nm, achieves the working waveband of 550—660 nm, the focus point’s size of below 420 nm, and the focusing efficiency of more than 30%.

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WANG Junjie, CHEN Deli, WANG Zhan, XUE Qi, SUN Xiaohong. Focusing enhanced broadband metalens via height optimization[J]. Optoelectronics Letters,2022,18(2):72-76

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History
  • Received:June 11,2021
  • Revised:August 19,2021
  • Online: February 23,2022
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