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.



50 YEARS OF SOLID-STATE LASERS


A long way from the ruby laser

Most Popular Articles

Webcasts

Ray Optics Simulations with COMSOL Multiphysics

The Ray Optics Module can be used to simulate electromagnetic wave propagation when the wavelength is much smaller than the smallest geometric entity in the ...

Multichannel Spectroscopy: Technology and Applications

This webcast, sponsored by Hamamatsu, highlights some of the photonic technology used in spectroscopy, and the resulting applications.

Handheld Spectrometers

Spectroscopy is a powerful and versatile tool that traditionally often required a large and bulky instrument. The combination of compact optics and modern pa...

Fracking, climate change, and lasers:  new tools to reduce fugitive methane emissions

This webcast, sponsored by Hamamatsu Corporation, covers recent developments and field deployments of compact quantum-cascade-laser (QCL)-based methane senso...
White Papers

Narrow-line fiber-coupled modules for DPAL pumping

A new series of fiber coupled diode laser modules optimized for DPAL pumping is presented, featur...

Accurate LED Source Modeling Using TracePro

Modern optical modeling programs allow product design engineers to create, analyze, and optimize ...

Optical Isolators Improve Engraving Performance of Pulsed Fiber Lasers

The deleterious effects of back reflections on pulsed fiber lasers used in marking and engraving ...
Technical Digests

ADHESIVES, SEALANTS, AND COATINGS: Solutions for optical technologies

A vast array of optical systems of various types and degrees of complexity require the use of adh...

WAVELENGTH-SWEPT LASERS: Dispersion-tuned fiber laser sweeps over a 140 nm range for OCT

By eliminating the use of mechanical tunable filters and instead tuning by intensity-modulation i...

Keeping pace with developments in photonic materials research

For demanding or custom spectroscopy solutions, care must be taken in selecting and integrating a...

HIGH-POWER FIBER LASERS: Working in the kilowatt regime

High-power materials-processing fiber lasers are available in an increasing variety of forms, as ...

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

RELATED PRODUCTS

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