Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Optomechanics and Photonics
Q 40.13: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Estimating the point spread function of a THz imaging system based on real image data — •Florian Lemke1,2, Konstantin Wenzel1, Clemens Seibold1, Martin Schell1,2, Peter Eisert1, Björn Globisch1,2, and Lars Liebermeister1 — 1Fraunhofer Heinrich Hertz Institute, Einsteinufer 37, 10587 Berlin, Germany — 2Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstraße 36, 10623 Berlin, Germany
Time-Domain-Spectroscopy (TDS) based on pulsed Terahertz (THz) radiation has steadily improved in recent years, leading to diverse applications in science and industry. Since THz radiation is reflected by conductors and transmitted by dielectric materials, THz TDS is well suited for non-destructive inspection of complex devices through raster scan imaging. In practice, however, the image quality of THz scans is not only limited by wavelength (0.03 mm to 3 mm) but also by the THz optical setup. In conventional image restoration, a sharpened image can be reconstructed by deconvolution of the recorded image with the optical system’s characteristic point spread function (PSF). For THz imaging, this has only been done with a theory-based modeled PSF that does not account for aberrations caused by the setup itself. In our work, we estimate the PSF of a THz TDS imaging system using real image data through deconvolution of THz scans of specifically designed samples with their corresponding sharp models. This opens the possibility for image restoration with the obtained PSF and provides a method to evaluate the imaging quality of THz optical setups and components.