Flexible metamaterial absorbers for stealth applications at terahertz frequencies

We have wrapped metallic cylinders with strongly absorbing metamaterials. These resonant structures, which are patterned on flexible substrates, smoothly coat the cylinder and give it an electromagnetic response designed to minimize its radar cross section. We compare the normal-incidence, small-bea...

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Bibliographic Details
Published in:Optics express 2012-01, Vol.20 (1), p.635-643
Main Authors: Iwaszczuk, Krzysztof, Strikwerda, Andrew C, Fan, Kebin, Zhang, Xin, Averitt, Richard D, Jepsen, Peter Uhd
Format: Article
Language:English
Subjects:
Computer Simulation
Elastic Modulus
Light
Manufactured Materials
Models, Theoretical
Refractometry - methods
Scattering, Radiation
Terahertz Radiation
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Summary:We have wrapped metallic cylinders with strongly absorbing metamaterials. These resonant structures, which are patterned on flexible substrates, smoothly coat the cylinder and give it an electromagnetic response designed to minimize its radar cross section. We compare the normal-incidence, small-beam reflection coefficient with the measurement of the far-field bistatic radar cross section of the sample, using a quasi-planar THz wave with a beam diameter significantly larger than the sample dimensions. In this geometry we demonstrate a near-400-fold reduction of the radar cross section at the design frequency of 0.87 THz. In addition we discuss the effect of finite sample dimensions and the spatial dependence of the reflection spectrum of the metamaterial.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.20.000635