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Open AccessArticle

Off-Axis Diffractive Optics for Compact Terahertz Detection Setup

1
Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00662 Warsaw, Poland
2
Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00662 Warsaw, Poland
3
Institute of Optoelectronics, Military University of Technology, Kaliskiego 2, 00908 Warsaw, Poland
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(23), 8594; https://doi.org/10.3390/app10238594
Received: 12 November 2020 / Revised: 26 November 2020 / Accepted: 27 November 2020 / Published: 30 November 2020
(This article belongs to the Special Issue THz Spectroscopy: Basic Science and Application)
Medical and many other applications require small-volume setups enabling terahertz imaging. Therefore, we aim to develop a device for the in-reflection examination of the samples. Thus, in this article, we focus on the diffractive elements for efficient redirection and focusing of the THz radiation. A terahertz diffractive optical structure has been designed, optimized, manufactured (using extrusion-based 3D printing) and tested. Two manufacturing methods have been used—direct printing of the structures from PA12, and casting of the paraffin structures out of 3D-printed molds. Also, the limitations of the off-axis focusing have been discussed. To increase the efficiency, an iterative algorithm has been proposed that optimizes off-axis structures to focus the radiation into small focal spots located far from the optical axis, at an angle of more than 30 degrees. Moreover, the application of higher-order kinoform structure design allowed the maintaining of the smallest details of the manufactured optical element, using 3D printing techniques. View Full-Text
Keywords: THz; diffractive optics; 3D printing; skin cancer diagnosis; iterative design; off-axis structures; beam redirecting THz; diffractive optics; 3D printing; skin cancer diagnosis; iterative design; off-axis structures; beam redirecting
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MDPI and ACS Style

Komorowski, P.; Surma, M.; Walczakowski, M.; Zagrajek, P.; Siemion, A. Off-Axis Diffractive Optics for Compact Terahertz Detection Setup. Appl. Sci. 2020, 10, 8594. https://doi.org/10.3390/app10238594

AMA Style

Komorowski P, Surma M, Walczakowski M, Zagrajek P, Siemion A. Off-Axis Diffractive Optics for Compact Terahertz Detection Setup. Applied Sciences. 2020; 10(23):8594. https://doi.org/10.3390/app10238594

Chicago/Turabian Style

Komorowski, Paweł; Surma, Mateusz; Walczakowski, Michał; Zagrajek, Przemysław; Siemion, Agnieszka. 2020. "Off-Axis Diffractive Optics for Compact Terahertz Detection Setup" Appl. Sci. 10, no. 23: 8594. https://doi.org/10.3390/app10238594

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