Detection mechanisms in graphene radiation sensors

交流电流整流在太赫兹石墨烯辐射传感器的主要检测机制将被检查，通过进行系统的实验与不同的布局和材料与石墨烯的组合，在频率从亚太赫兹到红外范围和宽的温度范围从4K到室温的设备。太赫兹辐射-石墨烯相互作用的基本方面，特别是太赫兹辐射检测的热电和等离子体激元（Dyakonov-Shur）机制的相互作用将被研究，着眼于光电应用。布局和材料将根据特定的目标探测机制进行调整，采用与行业兼容的工艺。然后将设计和测试室温辐射传感器的最佳布局，其中两个或多个检测机制将对输出信号做出建设性贡献，从而实现最大的响应度和最小的噪音。主要探测机制的识别和优化探测器的开发也将促进其他高频石墨烯设备的新设计，如THz混频器和快速焦平面成像阵列。

The main detection mechanisms of the ac-current rectification in THz graphene radiation sensors will be examined, by conducting systematic experiments on devices with different layouts and materials in combination with graphene, at frequencies from sub-THz to infrared range and wide temperature range from 4K up to room temperature. Fundamental aspects of terahertz radiation-graphene interaction and, in particular, interplay of the thermoelectric and plasmonic (Dyakonov-Shur) mechanisms of terahertz-radiation detection will be investigated, with an eye to optoelectronic applications. The layouts and materials will be tailored to favour a particular target detection mechanism using industry compatible processes. The optimal layout of the room-temperature radiation sensors will then be designed and tested, in which two- or several detection mechanisms will contribute constructively to the output signal, thereby allowing for the maximum responsivity and minimum noise. The identification of the main detection mechanisms and development of optimized detectors will also promote new designs of other high frequency graphene devices like THz mixers and fast focal plane imaging arrays.