Broadband semiconductor superlattice detector for THz radiation

Broadband semiconductor superlattice detector for THz radiation

We report on a broadband GaAs/AlAs superlattice detector for THz radiation; a THz field reduces the current through a superlattice, which is carried by miniband electrons, due to modulation of the Bloch oscillations of the miniband electrons. We studied the detector response, by use of a free electron laser, in a large frequency range ~5–12 THz!. The responsivity showed strong minima at frequen...

Reflection of THz Radiation by a Superlattice

The dynamics of a charged particle in a superlattice under the action of an external electric field has been the subject of intense research [1–6]. Under different conditions, an electron is predicted to reveal a variety of time-dependent phenomena such as Bloch oscillations [1], Zener tunneling [2], self-induced transparency [3], miniband collapse [4], negative differential conductivity, and a...

Ultrafast graphene-based broadband THz detector

An implantable semiconductor beta-radiation detector.

An implantable beta-radiation detector suitable for the measurement of reginal blood flow in the experimental animal by the indicator clearance principle is described. A lithium-drifted silicon diode encapsulated in a stainless steel case is sutured over the site of interest. A suitable beta-emitting isotope, such as 85Kr in saline solution, is injected into the arterial supply and its calibrat...

Semiconductor high-energy radiation scintillation detector

We propose a new scintillation-type detector in which high-energy radiation generates electron–hole pairs in a direct-gap semiconductor material that subsequently recombine producing infrared light to be registered by a photo-detector. The key issue is how to make the semiconductor essentially transparent to its own infrared light, so that photons generated deep inside the semiconductor could r...