A thin wire array and magnetic host structure with n<0 -: art. no. 10Q101
A thin wire array and magnetic host structure with n<0 -: art. no. 10Q101
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DOI：
10.1063/1.1846032
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发表时间：
2005-05-15
影响因子：
3.2
通讯作者：
Dewar, G
中科院分区：
文献类型：
--
作者：
Dewar, G
具有负折射率的人工介质的构造可以通过使用非导电亚铁磁主介质来提供负磁导率和使用导线阵列来提供负介电常数来简化。亚铁磁体和导线阵列之间的相互作用，破坏了导线阵列的负介电常数，可以通过用绝缘的非磁性护套包覆导线来克服。本文计算了正方形包层导线阵列在亚铁磁介质中的传播常数和传输系数。对于显著大于线阵列的晶格参数的波长，计算接近精确。对于直径为几微米的导线，晶格常数为0.8 mm，并且在偏置磁场中具有适当的亚铁磁主体，以16 GHz附近为中心的0.5 GHz宽的传输带呈现负折射率。亚铁磁体中的损耗和阻抗与真空的失配将通过3.0 cm厚的板的峰值传输幅度比限制为约3%。(c)2005年美国物理学会。
Construction of artificial media possessing a negative index of refraction can be simplified by using a nonconducting ferrimagnetic host medium to provide a negative permeability and an array of conducting wires to provide a negative permittivity. The interaction between the ferrimagnet and the wire array, which destroys the negative permittivity of the wire array, can be overcome by cladding the wires with an insulating, non magnetic jacket. Calculations of the propagation constants and transmission coefficients for a square array of cladded wires in a ferrimagnetic host are presented. The calculations are near exact for wavelengths significantly greater than the lattice parameter of the wire array. For wires a few microns in diameter, a lattice constant of 0.8 mm, and an appropriate ferrimagnetic host in a biasing magnetic field, a transmission band 0.5 GHz wide centered near 16 GHz exhibits a negative index of refraction. Losses in the ferrimagnet and impedance mismatch to vacuum limit the peak transmission amplitude ratio through a slab 3.0 cm thick to approximate to 3%. (c) 2005 American Institute of Physics.