采用贴片天线量子级联探测器的长波红外光伏外差接收机
Long-wavelength infrared photovoltaic heterodyne receivers using patch-antenna quantum cascade detectors
摘要：
量子级联探测器（QCD）是单极红外器件，其中光激发载流子的传输通过受限的电子态发生，而无需施加偏压。在该光伏模式中，检测器的噪声不受暗散粒噪声过程支配，因此，相对于光电导检测器，性能在高温下降低较少。本工作描述了一个9微米的量子色动力学嵌入到一个贴片天线超材料，其操作与国家的最先进的性能。超材料在收集区域Acoll上收集光子，Acoll比探测器的几何区域大得多，将信噪比提高到室温。在83 K时，背景极限探测率为5.5 x 10^10 cm Hz^1/2 W^-1，而在室温下，0 V偏压下的响应率为50 mA/W。贴片天线QCD是一种理想的接收器的外差检测设置，其中信号在频率为1.4 GHz和T=295 K的报告作为第一个演示的非制冷9 μ m的光伏接收器与GHz的电带宽。这些发现指导了非制冷红外量子限制探测的研究。
英文摘要：
Quantum cascade detectors (QCD) are unipolar infrared devices where the transport of the photo excited carriers takes place through confined electronic states, without an applied bias. In this photovoltaic mode, the detector's noise is not dominated by a dark shot noise process, therefore, performances are less degraded at high temperature with respect to photoconductive detectors. This work describes a 9 um QCD embedded into a patch-antenna metamaterial which operates with state-of-the-art performances. The metamaterial gathers photons on a collection area, Acoll, much bigger than the geometrical area of the detector, improving the signal to noise ratio up to room temperature. The background-limited detectivity at 83 K is 5.5 x 10^10 cm Hz^1/2 W^-1, while at room temperature, the responsivity is 50 mA/W at 0 V bias. Patch antenna QCD is an ideal receiver for a heterodyne detection set-up, where a signal at a frequency 1.4 GHz and T=295 K is reported as first demonstration of uncooled 9um photovoltaic receivers with GHz electrical bandwidth. These findings guide the research towards uncooled IR quantum limited detection.
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