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Proceedings Paper

Fibonacci subterahertz imaging: features and applications
Author(s): Domas Jokubauskis; Linas Minkevičius; Mindaugas Karaliūnas; Irmantas Kašalynas; Simonas Indrišiūnas; Gediminas Račiukaitis; Gintaras Valušis
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Paper Abstract

Fibonacci or bifocal terahertz (THz) imaging based on silicon diffractive zone plate in a continuous wave mode at 0.6 THz is demonstrated. Silicon as a low absorbing material was used in the laser ablation process to fabricate the Fibonacci structures. Zone plates were designed by the three-dimensional finite-difference time-domain method. To illustrate the Fibonacci focusing, the performance was studied both theoretically and experimentally by determining spatial profiles, the distance between the foci and the focal depth at frequencies of 0.3 THz and 0.6 THz. Terahertz images of various packaged objects at the 0.6 THz frequency were simultaneously recorded with the spatial resolution of wavelength in two different planes separated by 7 mm distance. Imaging performance using the Fibonacci lens is compared with the operation of the conventional silicon phase zone plate.

Paper Details

Date Published: 6 September 2019
PDF: 4 pages
Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 111240X (6 September 2019);
Show Author Affiliations
Domas Jokubauskis, Ctr. for Physical Sciences and Technology (Lithuania)
Linas Minkevičius, Ctr. for Physical Sciences and Technology (Lithuania)
Mindaugas Karaliūnas, Ctr. for Physical Sciences and Technology (Lithuania)
Irmantas Kašalynas, Ctr. for Physical Sciences and Technology (Lithuania)
Simonas Indrišiūnas, Ctr. for Physical Sciences and Technology (Lithuania)
Gediminas Račiukaitis, Ctr. for Physical Sciences and Technology (Lithuania)
Gintaras Valušis, Ctr. for Physical Sciences and Technology (Lithuania)


Published in SPIE Proceedings Vol. 11124:
Terahertz Emitters, Receivers, and Applications X
Manijeh Razeghi; Alexei N. Baranov; Miriam S. Vitiello, Editor(s)

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