Flexible materials for terahertz optics: advantages of graphite-based structures

Flexible materials for applications in terahertz (THz) range imaging systems are investigated in this study. THz time-domain spectroscopy and THz imaging at 0.6 THz frequency are used to analyze optical properties of zone plates (TZP) with integrated cross-shaped filters, which are fabricated using...

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Bibliographic Details
Published in:Optical materials express 2019-11, Vol.9 (11), p.4438
Main Authors: Ivaškevičiūtė-Povilauskienė, Rusnė, Minkevičius, Linas, Jokubauskis, Domas, Urbanowicz, Andrzej, Indrišiūnas, Simonas, Valušis, Gintaras
Format: Article
Language:English
Subjects:
Computer simulation
Direct laser writing
Finite difference time domain method
Graphite
Imaging
Optical properties
Terahertz frequencies
Tetragonal zirconia polycrystals
Zone plates
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Summary:Flexible materials for applications in terahertz (THz) range imaging systems are investigated in this study. THz time-domain spectroscopy and THz imaging at 0.6 THz frequency are used to analyze optical properties of zone plates (TZP) with integrated cross-shaped filters, which are fabricated using direct laser writing on thin graphite, HB pencil-shaded graphite on paper, as well as reference metal-based and pure paper zone plates. Spectral features and focusing power comparable to the best metal-based TZP is achieved with graphite-based TZP. The pure paper and paper with pencil-shaded graphite TZPs showed increase in focusing power by a factor of ∼1.5, supporting numerical 3D finite-difference time-domain simulations. The findings show that graphite-based TZPs can serve as a flexible, compact, and inexpensive optics elements for emerging THz imaging systems.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.9.004438