Experimental demonstration of electromagnetic tunneling through an epsilon-near-zero metamaterial at microwave frequencies

被引:418
作者
Liu, Ruopeng [1 ]
Cheng, Qiang [2 ]
Hand, Thomas [1 ]
Mock, Jack J. [1 ]
Cui, Tie Jun [2 ]
Cummer, Steven A. [1 ]
Smith, David R. [1 ]
机构
[1] Duke Univ, Dept Elect & Comp Engn, Ctr Metamat & Integrated Plasmon, Durham, NC 27708 USA
[2] Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Peoples R China
关键词
D O I
10.1103/PhysRevLett.100.023903
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Silveirinha and Engheta have recently proposed that electromagnetic waves can tunnel through a material with an electric permittivity (epsilon) near zero (ENZ). An ENZ material of arbitrary geometry can thus serve as a perfect coupler between incoming and outgoing waveguides with identical cross-sectional area, so long as one dimension of the ENZ is electrically small. In this Letter we present an experimental demonstration of microwave tunneling between two planar waveguides separated by a thin ENZ channel. The ENZ channel consists of a planar waveguide in which complementary split ring resonators are patterned on the lower surface. A tunneling passband is found in transmission measurements, while a two-dimensional spatial map of the electric field distribution reveals a uniform phase variation across the channel-both measurements in agreement with theory and numerical simulations.
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页数:4
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