螺旋阵列超表面支持的各向同性反向波。

Isotropic Backward Waves Supported by a Spiral Array Metasurface.

作者信息

Tremain Ben, Hooper Ian R, Sambles J Roy, Hibbins Alastair P

机构信息

Department of Physics and Astronomy, University of Exeter, EX4 4QL, Exeter, United Kingdom.

出版信息

Sci Rep. 2018 May 8;8(1):7098. doi: 10.1038/s41598-018-25469-7.

DOI:10.1038/s41598-018-25469-7

PMID:29740039

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5940691/

Abstract

A planar metallic metasurface formed of spiral elements is shown to support an isotropic backward wave over a narrow band of microwave frequencies. The magnetic field of this left-handed mode is mapped experimentally using a near-field scanning technique, allowing the anti-parallel group and phase velocities to be directly visualised. The corresponding dispersion relation and isofrequency contours are obtained through Fourier transformation of the field images.

摘要

由螺旋元件构成的平面金属超表面被证明在窄带微波频率范围内支持各向同性的反向波。使用近场扫描技术对这种左手模式的磁场进行了实验测绘，从而能够直接观察到反平行的群速度和相速度。通过对场图像进行傅里叶变换，得到了相应的色散关系和等频率轮廓。