Terahertz 3D printed diffractive lens matrices for field-effect transistor detector focal plane arrays. Auteur(s): Szkudlarek Krzesimir, Sypek Maciej, Cywiński Grzegorz, Suszek Jarosław, Zagrajek Przemysław, Feduniewicz-Żmuda Anna, Yahniuk Ivan, Yatsunenko Sergey, Nowakowska-Siwińska Anna, Coquillat D., But D., Rachoń Martyna, Węgrzyńska Karolina, Skierbiszewski Czesław, Knap W. (Article) Publié: Optics Express, vol. 24 p.20119-20131 (2016) Texte intégral en Openaccess : Ref HAL: hal-01406354_v1 PMID 27607620 DOI: 10.1364/OE.24.020119 WoS: WOS:000386091300023 Exporter : BibTex | endNote 12 Citations Résumé: 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. |