Open AccessTerahertz diffractive structures for compact in-reflection inspection setup
Author(s) -
Agnieszka Siemion,
Paweł Komorowski,
Mateusz Surma,
Izabela Ducin,
Piotr Sobotka,
Michał Walczakowski,
Elżbieta Czerwińska
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.382272
Subject(s) - optics , terahertz radiation , raster graphics , raster scan , detector , diffraction , reflection (computer programming) , materials science , radiation , sample (material) , focal length , physics , computer science , lens (geology) , artificial intelligence , thermodynamics , programming language
Two diffractive optical elements are used to create a compact raster THz scanning setup in reflective configuration. The first one focuses the radiation into the small focal spot on the sample, while the second one collects reflected radiation and focuses it on the detector. To assure small size of the setup and large apertures of optical elements, structures work in the off-axis geometry. Thus, the focal spot is formed 100 mm after and 60 mm below the optical axis of the element, which measures 75 mm in diameter. The designed iterative algorithm allows further minimization of these values.