Gate-controlled graphene nanoribbon array thz detector and tuning method

Abstract

The invention relates to a terahertz detector, in particular to a grid-control graphene nano-ribbon array THz (terahertz) detector and a tuning method. The detector comprises a bottom grid 1, a low-resistivity silicon substrate 2, a double-layer graphene nano-ribbon array 3, source and drain electrodes 4 and 5, insulating layers 6, top grids 7, 8 and 9 and a driving circuit 10. The double-layer graphene nano-ribbon array 3, the source and drain electrodes 4 and 5, the insulating layers 6, the top grids 7, 8 and 9 and the driving circuit 10 are arranged on the substrate. The tuning method includes constructing grid-control double-layer graphene nano-ribbon arrays with different widths by the aid of energy gap double regulation and control mechanisms of double-layer graphene under the effects of lateral constraints and perpendicular electric fields; changing grid voltages; synchronously scanning terahertz waves in a subsection manner to achieve the purpose of detecting wide bands. The grid-control graphene nano-ribbon array THz detector and the tuning method have the advantages of high sensitivity, fast response, broad detection band widths, flexibility in regulation, simple structure, convenience in integration, small size and capability of working at room temperatures. Besides, the grid-control graphene nano-ribbon array THz detector and the tuning method can be widely applied to security inspection, drug enforcement, anti-terrorism, medical imaging, nondestructive examination, electronic countermeasure, radar, remote sensing and outer space wideband communication fields and the like.

Description

technical field [0001] The invention relates to a terahertz detector, more specifically, the invention relates to a grid-controlled graphene nanoribbon array THz detector and a tuning method. technical background [0002] Compared with microwaves and light waves, terahertz waves have the characteristics of low photon energy, high temporal and spatial coherence, and strong penetration. In recent years, the demand for portable terahertz imaging / spectroscopy systems has become increasingly urgent in the fields of anti-terrorism and anti-terrorism, security inspection, anti-drug and on-site non-destructive testing. The miniaturization of terahertz systems and equipment puts forward requirements such as miniaturization and room temperature operation for its core components, THz source and THz detector. [0003] At present, the commonly used THz detection technology can be divided into coherent detection technology and direct detection technology. Compared with the expensive and...

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Problems solved by technology

According to its principle, it can be roughly divided into three categories: Thermal principle THz detector can realize broadband detection, but it needs to achieve high response speed and sensitivity in low temperature environment, and the accessory device required to realize low temperature environment is large, and the detector components are difficult to micro Miniaturization; plasma field effect tube THz detector has fast response speed and high sensitivity, but it needs to introduce antenna to couple terahertz signal, which is only suitable for low-frequency THz, and its bandwidth is relatively narrow, so its application in terahertz spectroscopy system is limited; photon The type THz detector can realize the detection of high-frequency THz waves, and has the advantages of fast response speed, high sensitivity, and simple structure, but its narrow response bandwidth is limited by the application of THz spectroscopy systems.

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