High-permittivity ceramics enabled highly homogeneous zero-index metamaterials for high-directivity antennas and beyond

Yueyang Liu; Tian Dong; Xu Qin; Weijia Luo; Ning Leng; Yujing He; Yong Yuan; Ming Bai; Jingbo Sun; Ji Zhou; Yue Li; Yang Li

doi:10.1186/s43593-023-00059-x

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High-permittivity ceramics enabled highly homogeneous zero-index metamaterials for high-directivity antennas and beyond

eLight Vol. 4, (2024)

RESEARCH ARTICLE | Updated：2024-09-25

- High-permittivity ceramics enabled highly homogeneous zero-index metamaterials for high-directivity antennas and beyond
- Affiliations：
  
  State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
  State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  The School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
- Author bio：
  
  *Ming Baimbai@buaa.edu.cn
  Jingbo Sunjingbosun@mail.tsinghua.edu.cn
  Ji Zhouzhouji@tsinghua.edu.cn
  Yue Lilyee@tsinghua.edu.cn
  Yang Liyli9003@mail.tsinghua.edu.cn
- Funds：
- DOI：10.1186/s43593-023-00059-x
  CLC：
- Received：19 July 2023，
  
  Revised：12 November 2023，
  
  Accepted：2023-11-18，
  
  Published Online：05 February 2024，
  
  Published：2024-12
- Accepted：
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Yueyang Liu, Tian Dong, Xu Qin, et al. High-permittivity ceramics enabled highly homogeneous zero-index metamaterials for high-directivity antennas and beyond[J]. Elight, 2024, 4.
DOI：

Yueyang Liu, Tian Dong, Xu Qin, et al. High-permittivity ceramics enabled highly homogeneous zero-index metamaterials for high-directivity antennas and beyond[J]. Elight, 2024, 4. DOI： 10.1186/s43593-023-00059-x.

摘要

Abstract

Zero-index metamaterials (ZIMs) can support uniform electromagnetic field distributions at any frequency

but their applications are hampered by the ZIM’s homogenization level—only 3 unit cells per free-space wavelength

which is fundamentally limited by the low-permittivity inclusions (

≈ 12) and background matrix (

≈ 1). Here

by filling high-permittivity SrTiO

ceramic (

≈ 294) pillars in BaTiO

(

≈ 25) background matrix

we demonstrate a highly homogeneous microwave ZIM with an over threefold increase in the homogenization level. Leveraging such a ZIM

we achieve not only an antenna

approaching the fundamental limit in the directivity with outstanding scalability

but also a concave lens with a focal length of as short as 1

. Our highly homogeneous ZIM has profound implications in ceramics

ZIM-based waveguides and cavities

free-space wavefront manipulation

and microwave quantum optics

and opens up enormous possibilities in wireless communications

remote sensing

global positioning satellites

etc.

关键词

Keywords

references

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