Photothermoelectric Terahertz Detectors based on 3D Graphene

Terahertz, located between microwave and infrared, is in the intersection of electronics and photonics. It has the advantages of safety, fingerprint spectrum, broadband and penetrability. It can be widely used in biomedical, non-destructive testing, radar, communication, military, aerospace and other fields. Terahertz detectors are an integral part of terahertz applications, but due to limitations in material properties, terahertz detectors are slow to develop. As a new two-dimensional material, 3D graphene has an ultra-high absorption in terahertz, which is very suitable as a terahertz detector. Here we design and fabricated 3D grapheme THz detectors with low NEP, high responsivities and fast response speed. The results show that these kind of photothermoelectric detectors are expected to be a new generation of high performance detectors in terahertz region.