论文标题
在Terahertz频率下具有亚纳秒响应时间的热电石墨烯光电探测器
Thermoelectric graphene photodetectors with sub-nanosecond response times at Terahertz frequencies
论文作者
论文摘要
Terahertz（THZ）频率范围（0.1-10 THz）和室温下的超快和敏感（噪声等效功率<1 NWHZ-1/2）的光检测对于时间分辨的THz频谱，例如气体的THZ光谱，复杂分子和冷量，成像，量级，超速和量化数据，量量和室温是关键。在纳米级的材料和设备中捕获超快动力学的快照。在这里，我们报告了室温Thz纳米接收器，利用天线耦合的石墨烯现场效应晶体晶体管，这些晶体晶体管与光刻图案的高伴侣（〜100 GHz）芯片集成在一起，与高速（数百个PS PS响应时间）组合使用（数百个PS响应时间）和高灵敏度（噪声等效功率）（噪声等效功率<120 PWHZ-1/2）。值得注意的是，这是通过各种天线和晶体管架构（单门，双门）实现的，它们的操作频率可以在整个0.1-10 THz范围内扩展，从而为在远红外的Ultrafast石墨烯阵列设计铺平了道路，以靶向面向上述应用程序。
Ultrafast and sensitive (noise equivalent power <1 nWHz-1/2) light-detection in the Terahertz (THz) frequency range (0.1-10 THz) and at room-temperature is key for applications such as time-resolved THz spectroscopy of gases, complex molecules and cold samples, imaging, metrology, ultra-high-speed data communications, coherent control of quantum systems, quantum optics and for capturing snapshots of ultrafast dynamics, in materials and devices, at the nanoscale. Here, we report room-temperature THz nano-receivers exploiting antenna-coupled graphene field effect transistors integrated with lithographically-patterned high-bandwidth (~100 GHz) chips, operating with a combination of high speed (hundreds ps response time) and high sensitivity (noise equivalent power <120 pWHz-1/2) at 3.4 THz. Remarkably, this is achieved with various antenna and transistor architectures (single-gate, dual-gate), whose operation frequency can be extended over the whole 0.1-10 THz range, thus paving the way for the design of ultrafast graphene arrays in the far infrared, opening concrete perspective for targeting the aforementioned applications.
