New graphene-based light detector can unearth everything hidden

Terahertz radiation can be brought to market with the help of a new detector. Terahertz radiation is a type of light with far longer wavelengths compared to infrared rays and may be helpful in examining almost everything very effectively.
Researchers have concluded that this latest graphene-based light detector may be able to calculate wavelengths of light that human eye may not see.
A report while talking about terahertz says, “The terahertz range refers to electromagnetic waves with frequencies between 100 GHz and 10 THz, or wavelengths between 3 mm and 30 μm. Light between radio waves and infrared has some unique properties. Terahertz waves pass through a variety of amorphous substances – many synthetics and textiles, but also paper and cardboard are transparent to terahertz waves. Many biomolecules, proteins, explosives or narcotics also feature characteristic absorption lines, so-called spectral “fingerprints”, at frequencies between 0.1 and 2 THz. The two main advantages of terahertz radiation are thus the penetration of conventionally opaque materials on one hand, and a high chemical selectivity on the other hand”.
Researchers have said that Terahertz radiation that is located in between infrared and microwave frequencies on the electromagnetic spectrum and detectors may be able to work at the two given frequencies to come up with more sensor equipment with much greater sensitivity than today’s technology.
There is no denying the fact that graphene, a sheet of carbon one atom thick, has without doubt great electronic and physical properties. It also has the capability to absorb a wide range of electromagnetic frequencies, making it ideal for use as a terahertz detector.
In a press release Center for Nanophysics and Advanced Materials says, “University of Maryland researchers have discovered a way to control magnetic properties of graphene that could lead to powerful new applications in magnetic storage and magnetic random access memory”. Light hitting graphene in the detector excites atoms of carbon in the material. According to them the excessive energy is then drained very fast to surrounding molecules. According to them if electrical contacts are placed on the graphene, this energy will consequently move toward the metal. They say that applying two varying materials for the contacts, like chromium and gold, creates a current in the device. This helps the new detector to measure the amount of terahertz energy.