title: Flexible metamaterial absorbers for stealth applications at terahertz frequencies.
abstract: 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.
authors.affiliation: DTU Fotonik—Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Iwaszczuk
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Strikwerda
authors.forename: Kebin
authors.initials: K
authors.lastname: Fan
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Richard D
authors.initials: RD
authors.lastname: Averitt
authors.forename: Peter Uhd
authors.initials: PU
authors.lastname: Jepsen
mesh_terms: D003198:Computer Simulation; D055119:Elastic Modulus; D008027:Light; D008420:Manufactured Materials; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D055053:Terahertz Radiation