MIPT scientists and their colleagues from Japan and the U.S. have calculated the parameters of photodetectors comprised of layers of graphene and a combination of black phosphorus and black arsenic. These sensors are able to detect radiation with energy less than the band gap of the constituent layers without graphene. It is also easy to modify them in order to increase their sensitivity to the required wavelength of light. Such sensors could replace far-infrared and terahertz radiation detectors. The research findings were published in the journal Optics Express.
The new sensors will benefit many areas of science and technology. The far-infrared band is substantial both for household applications and for fundamental science. These waves are emitted by cosmic dust, whose study reveals the evolution of galaxies. Infrared light sensors are used in night vision equipment, remote controls, homing missiles, and heartbeat sensors. Terahertz radiation offers a less dangerous alternative to X-ray baggage scanners.
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