Abstract-Multiplexing THz Vortex Beams With a Single Diffractive 3-D Printed Len

Federico Machado, Przemysław Zagrajek, Vicente Ferrando, Juan A. Monsoriu, Walter D. Furlan

https://ieeexplore.ieee.org/document/8550797

We present a novel method for experimentally generating multiplexed THz vortex beams by using a single three-dimensional printed element that combines a set of radially distributed spiral phase plates, and a binary focusing Fresnel lens. With this element, we have experimentally demonstrated that THz multiplexing can be tailored to fit within a small space on an optical bench. Results are presented beside numerical simulations, demonstrating the robust nature of the experimental method.

Abstract-Multiplexing THz vortex beams with a single diffractive 3D printed lens

Federico Machado,  Przemyslaw Zagrajek, Vicente Ferrando, Juan A. A. Monsoriu,  Walter D. Furlan


https://ieeexplore.ieee.org/document/8550797

We present a novel method for experimentally generating multiplexed THz vortex beams by using a single 3D printed element that combines a set of radially distributed spiral phase plates, and a binary focusing Fresnel lens. With this element we have experimentally demonstrated that THz multiplexing can be tailored to fit within a small space on an optical bench. Results are presented beside numerical simulations, demonstrating the robust nature of the experimental method.

Abstract- Terahertz Sieves

Federico Machado,  Zagrajek, Juan A. Monsoriu, Walter D. Furlan

http://ieeexplore.ieee.org/document/8093702/

Imaging at terahertz (THz) frequencies offers a great potential for applications including security screening, telecommunications biodetection, and spectroscopy. Some of these applications need specially designed lenses with customized characteristics that are not commercially available. In this letter, we present the THz sieves as a new kind of THz lenses. We demonstrate that these lenses improve the resolution of conventional zone plates constructed with the same level of detail. Amplitude and phase THz sieves were three-dimensional printed and tested experimentally. Excellent agreement was obtained between the experimental and calculated results.

Abstract-3D printed diffractive terahertz lenses

Walter D. Furlan, Vicente Ferrando, Juan A. Monsoriu, Przemysław Zagrajek, Elżbieta Czerwińska, and Mieczysław Szustakowski
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-41-8-1748

A 3D printer was used to realize custom-made diffractive THz lenses. After testing several materials, phase binary lenses with periodic and aperiodic radial profiles were designed and constructed in polyamide material to work at 0.625 THz. The nonconventional focusing properties of such lenses were assessed by computing and measuring their axial point spread function (PSF). Our results demonstrate that inexpensive 3D printed THz diffractive lenses can be reliably used in focusing and imaging THz systems. Diffractive THz lenses with unprecedented features, such as extended depth of focus or bifocalization, have been demonstrated.

© 2016 Optical Society of America

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