3.5 THz quantum-cascade laser emission from dual diagonal feedhorns
3.5 THz quantum-cascade laser emission from dual diagonal feedhorns
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DOI：
10.1017/s175907871900028x
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发表时间：
2019-05
影响因子：
1.4
通讯作者：
B. Ellison;A. Valavanis;O. Auriacombe;D. Gerber;T. Rawlings;N. Brewster;M. Oldfield;Y. Han;L. Li;E. Zafar;E. Linfield;A. Davies;G. Savini;M. Emes;B. Winter;D. Walker;E. Sáenz
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文献类型：
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作者：
B. Ellison;A. Valavanis;O. Auriacombe;D. Gerber;T. Rawlings;N. Brewster;M. Oldfield;Y. Han;L. Li;E. Zafar;E. Linfield;A. Davies;G. Savini;M. Emes;B. Winter;D. Walker;E. Sáenz
摘要 介绍了从双金属超太赫兹频率 (supra-THz) 量子级联激光器 (QCL) 获得的天线方向图测量结果。 QCL 安装在包含双对角馈源的机械微加工波导腔内。在 3.5 THz 的连续波模式下工作，在 ~60 K 的环境温度下，QCL 发射通过馈源被引导至安装在多轴线性扫描仪上的超太赫兹探测器。模拟和测量的远场天线方向图的比较表明，波束宽度（半高全宽）和旁瓣内容之间具有出色的相关性，并且与未安装的设备相比，有非常显着的改进。此外，单个输出已用于成功照亮和演示与未来超太赫兹地球观测星载有效载荷相关的光学面包板布置。因此，我们的新型设备为未来星载超高频地球观测外差辐射计的超太赫兹对角馈源喇叭和 QCL 设备的有效性提供了有价值的演示。
Abstract Antenna-pattern measurements obtained from a double-metal supra-terahertz-frequency (supra-THz) quantum cascade laser (QCL) are presented. The QCL is mounted within a mechanically micro-machined waveguide cavity containing dual diagonal feedhorns. Operating in continuous-wave mode at 3.5 THz, and at an ambient temperature of ~60 K, QCL emission has been directed via the feedhorns to a supra-THz detector mounted on a multi-axis linear scanner. Comparison of simulated and measured far-field antenna patterns shows an excellent degree of correlation between beamwidth (full-width-half-maximum) and sidelobe content and a very substantial improvement when compared with unmounted devices. Additionally, a single output has been used to successfully illuminate and demonstrate an optical breadboard arrangement associated with a future supra-THz Earth observation space-borne payload. Our novel device has therefore provided a valuable demonstration of the effectiveness of supra-THz diagonal feedhorns and QCL devices for future space-borne ultra-high-frequency Earth-observing heterodyne radiometers.