Terahertz 3D printed diffractive lens matrices for field-effect transistor detector focal plane arrays.
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.
Krzesimir
K
Szkudlarek
Maciej
M
Sypek
Grzegorz
G
Cywiński
Jarosław
J
Suszek
Przemysław
P
Zagrajek
Anna
A
Feduniewicz-Żmuda
Ivan
I
Yahniuk
Sergey
S
Yatsunenko
Anna
A
Nowakowska-Siwińska
Dominique
D
Coquillat
Dmytro B
DB
But
Martyna
M
Rachoń
Karolina
K
Węgrzyńska
Czesław
C
Skierbiszewski
Wojciech
W
Knap