利用100 GHz、3 dB带宽的中红外量子阱光电探测器实现室温实时啁啾脉冲外差探测
Real-time, chirped-pulse heterodyne detection at room-temperature with 100GHz 3dB-bandwidth mid-infrared quantum-well photodetectors
AI总结：
本文研制室温100 GHz带宽的GaAs多量子阱中红外光电探测器，并以宽带外差电子学单次实时获取逾100 GHz的频率校准分子光谱。
摘要：
得益于ps时间尺度上本征较短的电子弛豫过程，III-V族半导体单极器件是在中红外频段实现超高速工作的理想候选者。本工作展示了工作于10–11 μm范围、天线耦合且基于GaAs的多量子阱光电探测器；其在室温下具有0.3 A/W的响应度和100 GHz的3 dB截止带宽。频率响应测量最高达到220 GHz：在100 GHz以上，我们发现滚降主要由光激发电子2.5 ps的复合时间主导。为说明这些探测器的潜力，本文搭建了一项实验，以电子方式实时测量脉冲模式下工作的量子级联激光器随时间变化的发射频率，覆盖超过60 GHz的频率范围。通过利用宽带电子学，并借助其高信噪比，该技术能够单次采集跨度高达100 GHz乃至更宽、经频率校准的中红外分子光谱，这对于环境或燃烧监测等领域中的快速主动遥感应用尤其具有吸引力。
英文摘要：
Thanks to intrinsically short electronic relaxation on the ps time scale, III-V semiconductor unipolar devices are ideal candidates for ultrahigh-speed operation at mid-infrared frequencies. In this work, antenna-coupled, GaAs-based multi quantum-well photodetectors operating in the 10-11um range are demonstrated, with a responsivity of 0.3A/W and a 3dB-cutoff bandwidth of 100GHz at room-temperature. The frequency response is measured up to 220GHz: beyond 100GHz we find a roll-off dominated by the 2.5 ps-long recombination time of the photo-excited electrons. The potential of the detectors is illustrated by setting up an experiment where the time dependent emission frequency of a quantum cascade laser operated in pulsed mode is measured electronically and in real-time, over a frequency range >60GHz. By exploiting broadband electronics, and thanks to its high signal-to-noise ratio, this technique allows the acquisition, in a single-shot, of frequency-calibrated, mid-infrared molecular spectra spanning up to 100GHz and beyond, which is particularly attractive for fast, active remote sensing applications in fields such as environmental or combustion monitoring.
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