Contactless Terahertz Sensing of Ultrafast Switching in Marx Generator Based on Avalanche Transistors

the effect analysis of proficiency on language - switching in iranian efl learners writing

abstract in a protocol analysis of second language writing from 20 adult english as a foreign language (efl) iranian students, this research observed how language-switching (l-s), i.e., first language use in l2 writing, was affected by l2 proficiency. switching interactively between first (l1) and second (l2) languages has been recognized as one of the salient characteristics of l2 writing....

Ultrafast Pulsed Terahertz Sensing for Process Monitoring and Industrial Imaging

We present here a recently developed approach of Terahertz Time Domain Spectroscopy (THz-TDS) and its application on rapid and precise Non-Destructive Testing (NDT) of composites and concealed objects. Electromagnetic radiation of THz frequencies can penetrate dielectric materials without ionizing effect; it allows the contact-free testing of dielectric volumes or buried metallic surfaces and c...

Plasmonic Terahertz Wave Detectors Based on Silicon Field-Effect Transistors

Ultrafast optical switching of terahertz metamaterials fabricated on ErAs/GaAs nanoisland superlattices.

We demonstrate optical switching of electrically resonant terahertz planar metamaterials fabricated on ErAs/GaAs nanoisland superlattice substrates. Photoexcited charge carriers in the superlattice shunt the capacitive regions of the constituent elements, thereby modulating the resonant response of the metamaterials. A switching recovery time of 20 ps results from fast carrier recombination in ...

Portable Marx Generator for Microplasma Applications

There are many applications using pulsed power such as the triggering of high speed cameras and spectrometers, the processing or chemical analysis of minute material, and the stimulation of cells by electrical pulses. The pulse width and voltage required for each application are different in the range of ns and kV. The energy required is usually in the mJ regime. Here, a novel portable pulse po...