Flexible terahertz metamaterial is useful in stealth applications

A flexible metamaterial film created by researchers at the Technical University of Denmark (Lyngby, Denmark) and Boston University (Boston, MA) drastically reduces reflection of terahertz radiation, and can serve as a "stealth" material to minimize objects' radar cross-section at terahertz frequencies. The material was wrapped around a metallic cylinder for test, reducing the cylinder’s cross-section by close to 400 times at 0.87 THz.

The film consists of a 12-μm-thick polyimide (PI) layer, a 200-nm-thick layer of gold (Au), a second 12-μm-thick layer of PI, and a second 200-nm-thick layer of Au patterned by photolithography. The pattern is a periodic array of split-ring resonators with a unit cell size of 75 μm and a resonator side length of 54.5 μm. Total active area is 20 × 10 mm, spanned by two 10 × 10 mm inactive areas so the cylinder could be rotated to vary reflectivity. For radar tests, electro-optically generated terahertz pulses showed a reduction in cross-section by an average factor of at least 10 in the ±20° angular range. Contact Peter Uhd Jepsen at puje@fotonik.dtu.dk.

Most Popular Articles


Click here to have your products listed in the Laser Focus World Buyers Guide.



Up to 18W TEMoo, ultra low noise, integrated chiller


Up to 10W TEMoo, ultra low noise, integrated chiller


Fiber optics Partial discharge sensors and system



Manufactures high performance CCD/CMOS cameras for machine vision, medical, traffic sys...

Photonics Bretagne

Offers a cluster composed of research centers, schools and companies all in the field o...

Lighthouse Photonics Inc

Provides sealed, turn-key, cost-effective, diode-pumped solid-state (DPSS) lasers for s...

Social Activity

Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS