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Transmissive terahertz metalens with full phase control based on a dielectric metasurface

机译:具有基于电介质元表面的全相控制的透射太赫兹金属

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摘要

In this paper, we report a transmissive terahertz (THz) metalens based on a dielectric metasurface that consists of periodically arranged sub-wavelength silicon cross resonators with a spatially hyperboloidal phase profile. By varying arm lengths of the cross resonators, we obtained a full 2 pi phase coverage with high transmission at target frequency. The fabricated metalens was experimentally demonstrated to focus a continuous THz beam to a spot with a full width at half-maximum of 630 mu m at a focal length of 28 mm, which agrees well with the theoretical calculation. This device has potential for applications in THz imaging and communications, and our work can also easily be extended in the design of other planar THz components, such as beam deflectors or vortex plates. (C) 2017 Optical Society of America
机译:在本文中,我们报告了一种基于介电质元表面的透射太赫兹(THz)金属,其包括周期性地布置具有空间双曲线相谱的子波长硅交叉谐振器。 通过不同的交叉谐振器的臂长度,我们在目标频率下获得了具有高传输的完整2 PI相位覆盖。 通过实验证明制造的金属将连续的THz光束聚焦到具有全宽的斑点,以28毫米的焦距为630 mu m的全宽度,这与理论计算吻合良好。 该设备具有在THz成像和通信中的应用程序,并且我们的工作也可以在其他平面THZ组件的设计中轻松扩展,例如光束偏转器或涡流板。 (c)2017年光学学会

著录项

  • 来源
    《Optics Letters》 |2017年第21期|共4页
  • 作者单位

    Peking Univ Inst Microelect Natl Key Lab Sci &

    Technol Micro Nano Fabricat Beijing 100871 Peoples R China;

    Peking Univ Inst Microelect Natl Key Lab Sci &

    Technol Micro Nano Fabricat Beijing 100871 Peoples R China;

    Peking Univ Inst Microelect Natl Key Lab Sci &

    Technol Micro Nano Fabricat Beijing 100871 Peoples R China;

    Peking Univ Inst Microelect Natl Key Lab Sci &

    Technol Micro Nano Fabricat Beijing 100871 Peoples R China;

    Capital Normal Univ Beijing Adv Innovat Ctr Imaging Technol Dept Phys Beijing 100048 Peoples R China;

    Capital Normal Univ Beijing Adv Innovat Ctr Imaging Technol Dept Phys Beijing 100048 Peoples R China;

    Peking Univ Inst Microelect Natl Key Lab Sci &

    Technol Micro Nano Fabricat Beijing 100871 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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