Detection mechanisms in graphene radiation sensors

通过在不同布局和材料的器件上，结合石墨烯，在从亚太赫兹到红外的频率和从4K到室温的宽温度范围内进行系统的实验，研究了太赫兹石墨烯辐射传感器中交流整流的主要检测机制。太赫兹辐射-石墨烯相互作用的基本方面，特别是太赫兹辐射探测的热电和等离子体(Dyakonov-Shur)机制的相互作用将被研究，着眼于光电子应用。布局和材料将进行量身定做，以支持使用行业兼容工艺的特定目标检测机制。然后将设计和测试室温辐射传感器的最佳布局，其中两个或几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声。对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器件的新设计，如太赫兹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.