Krzesimir Szkudlarek, Maciej Sypek, Grzegorz Cywiński, Jarosław Suszek, Przemysław Zagrajek, Anna Feduniewicz-Żmuda, Ivan Yahniuk, Sergey Yatsunenko, Anna Nowakowska-Siwińska, Dominique Coquillat, Dmytro B. But, Martyna Rachoń, Karolina Węgrzyńska, Czesław Skierbiszewski, and Wojciech Knap
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-18-20119
We present the concept, the fabrication processes and the experimental results for materials and optics that can be used for terahertz field-effect transistor detector focal plane arrays. More specifically, we propose 3D printed arrays of a new type – diffractive multi-zone lenses of which the performance is superior to that of previously used mono-zone diffractive or refractive elements and evaluate them with GaN/AlGaN field-effect transistor terahertz detectors. Experiments performed in the 300-GHz atmospheric window show that the lens arrays offer both a good efficiency and good uniformity, and may improve the signal-to-noise ratio of the terahertz field-effect transistor detectors by more than one order of magnitude. In practice, we tested 3 × 12 lens linear arrays with printed circuit board THz detector arrays used in postal security scanners and observed significant signal-to-noise improvements. Our results clearly show that the proposed technology provides a way to produce cost-effective, reproducible, flat optics for large-size field-effect transistor THz-detector focal plane arrays.
© 2016 Optical Society of America
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