Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 50: HL Poster IV
HL 50.6: Poster
Donnerstag, 15. März 2018, 19:00–21:00, Poster B
Investigation of 3D-printed phase waveplates for THz beam shaping — •Jan Gospodaric1, Stefan Rotter2, Christian Huber3, Dieter Suess3, and Andrei Pimenov1 — 1Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria — 2Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria — 3Faculty of Physics, University of Vienna, 1090 Wien, Austria
Additive manufacturing with 3D-printers has gained significant attention in the recent years due to its versatility, accessibility and generally because it presents a quick, easy-to-use and affordable technique to produce complex and high-precision structures. The layer height resolution of 3D-printers (up to 0.1 mm) and high transparency of the polymers used in 3D-printers are suitable for printing devices that manipulate electromagnetic radiation in the THz region — a frequency range that recently gained a lot of attention. Here we present a way of calculating, designing and fabricating a THz waveplate that phase modulates an incident THz beam (λ=2.14 mm) in order to create a predefined intensity profile of the optical wavefront on the distant image plane. The calculation was performed for two distinct target intensities with the use of the Gerchberg-Saxton algorithm. Resulting phase modulating profiles were used to model two elements, which were printed out of polyactide (PLA) with a commercially available 3D-printer and then tested in an optical experimental setup, which showed good agreement with the preliminary theoretical predictions.