Application of terahertz (sub-terahertz) inspection systems in the integrated security systems

Terahertz Radome Inspection

Radomes protecting sensitive radar, navigational, and communications equipment of, e.g., aircraft, are strongly exposed to the environment and have to withstand harsh weather conditions and potential impacts. Besides their significance to the structural integrity of the radomes, it is often crucial to optimize the composite structures for best possible radio performance. Hence, there exists a s...

hotonic Control of Terahertz Systems

The use of Optical Control for millimeter wave systems has been extended recently to frequencies well over 100 GHZ. New types of optical modulators, detectors and mixers can now be used to make novel systems for the first time operating at submillimeter wavelengths. In addition to the fabrication of the next generation of traveling wave polymer modulators and phototransistors, we have also deve...

Microelectromechanical systems bimaterial terahertz sensor with integrated metamaterial absorber.

This Letter describes the fabrication of a microelectromechanical systems (MEMS) bimaterial terahertz (THz) sensor operating at 3.8 THz. The incident THz radiation is absorbed by a metamaterial structure integrated with the bimaterial. The absorber was designed with a resonant frequency matching the quantum cascade laser illumination source while simultaneously providing structural support, des...

Resonant Tunneling Diodes for Sub-Terahertz and Terahertz Oscillators

Terahertz spectroscopy of quantum 2D electron systems

Terahertz time-domain spectroscopy permits the coherent motion of charges to be examined in a diverse range of two-dimensional semiconductor heterostructures. Studies of the THz conductivity and magnetoconductivity of two-dimensional quantum systems are reviewed, including cyclotron resonance spectroscopy and the transverse conductivity in the Hall and quantum Hall regimes. Experiments are desc...