High Sensitivity Terahertz Detection through Large-Area Plasmonic Nano-Antenna Arrays.
High Sensitivity Terahertz Detection through Large-Area Plasmonic Nano-Antenna Arrays.
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DOI：
10.1038/srep42667
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发表时间：
2017-02-16
影响因子：
4.6
通讯作者：
Jarrahi M
中科院分区：
文献类型：
--
作者：
Yardimci NT;Jarrahi M
在时域太赫兹成像和光谱系统中，等离子体光电导天线对于提高传统光电导探测器的响应度和探测灵敏度具有很大的前景。然而，先前展示的等离子体光电导天线的操作带宽受到其天线的带宽约束和光电导体寄生效应的限制。在这里，我们提出了一个强大的技术，实现宽带太赫兹探测器通过大面积等离子体光导纳米天线阵列。一个关键的新奇，使所提出的太赫兹探测器上级国家的最先进的是一个特定的大面积的设备几何形状，提供了一个强大的相互作用的入射太赫兹光束和光泵在纳米级，同时保持了广泛的操作带宽。大的器件有源区域允许针对光学和太赫兹光束未对准的鲁棒操作。我们展示了宽带太赫兹检测的信噪比高达107 dB的水平。
Plasmonic photoconductive antennas have great promise for increasing responsivity and detection sensitivity of conventional photoconductive detectors in time-domain terahertz imaging and spectroscopy systems. However, operation bandwidth of previously demonstrated plasmonic photoconductive antennas has been limited by bandwidth constraints of their antennas and photoconductor parasitics. Here, we present a powerful technique for realizing broadband terahertz detectors through large-area plasmonic photoconductive nano-antenna arrays. A key novelty that makes the presented terahertz detector superior to the state-of-the art is a specific large-area device geometry that offers a strong interaction between the incident terahertz beam and optical pump at the nanoscale, while maintaining a broad operation bandwidth. The large device active area allows robust operation against optical and terahertz beam misalignments. We demonstrate broadband terahertz detection with signal-to-noise ratio levels as high as 107 dB.