Experimental demonstration of tunable negative phase velocity and negative refraction in a ferromagnetic/ferroelectric composite metamaterial

被引：26
|
作者：
Zhao, Hongjie [1 ]
Kang, Lei [1 ]
Zhou, Ji [1 ]
Zhao, Qian [1 ]
Li, Longtu [1 ]
Peng, Liang [2 ]
Bai, Yang [3 ]
机构：
[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Zhejiang Univ, Electromagnet Acad, Hangzhou 310027, Peoples R China
[3] Univ Sci & Technol Beijing, Minist Educ, Key Lab Environm Fracture, Ctr Corros & Protect, Beijing 100083, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 20期
基金：
美国国家科学基金会;
关键词：
barium compounds; composite materials; ferroelectric materials; ferromagnetic materials; magnetoelectric effects; metamaterials; permittivity; refraction; refractive index; strontium compounds; yttrium compounds;
D O I：
10.1063/1.3033397
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A tunable left-handed transmission is demonstrated experimentally in a ferromagnetic/ferroelectric composite metamaterial (CMM) consisting of an array of yttrium iron garnet (YIG) rods combined with barium strontium titanate (BST) rods. We observed a passband in the CMM within the overlap of the stop bands of YIG rods alone and BST rods alone. Both measured phase velocity and refractive index of the CMM are shown to be negative at the relevant frequency range. The frequency showing left handedness can be adjusted continuously, dynamically, and reversibly by an applied magnetic field with a sensitive response of 3.5 GHz/kOe.
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页数：3
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