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Scattering of spoof surface plasmon polaritons in defect-rich THz waveguides

Klein, Andreas K.; Basden, Alastair; Hammler, Jonathan; Tyas, Luke; Cooke, Michael; Balocco, Claudio; Zeze, Dagou; Girkin, John M.; Gallant, Andrew

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Authors

Andreas K. Klein

Alastair Basden

Luke Tyas

Michael Cooke

Claudio Balocco

Dagou Zeze



Abstract

We report on the first observation of ‘Spoof’ Surface Plasmon Polariton (SPP) scattering from surface defects on metal-coated 3D printed, corrugated THz waveguiding surfaces. Surface defects, a result of the printing process, are shown to assist the direct coupling of the incident free-space radiation into a spoof SPP wave; removing the need to bridge the photon momentum gap using knife-edge or prism coupling. The free space characteristics, propagation losses and confinement of the spoof SPPs to the surface are measured, and the results are compared to finite-difference time domain simulations. Angular resolved THz spectroscopy measurements reveal the scattering patterns from surfaces and are compared with Mie theory, taking into account the shortened wavelength of the photons in their bound SPP state compared to their free space wavelength. These results confirm yet another similarity between the properties of THz spoof SPPs and their natural, non-spoof, counterparts at optical and infrared frequencies which also, unexpectedly, adds functionality to the structures.

Citation

Klein, A. K., Basden, A., Hammler, J., Tyas, L., Cooke, M., Balocco, C., …Gallant, A. (2019). Scattering of spoof surface plasmon polaritons in defect-rich THz waveguides. Scientific Reports, 9(1), Article 6288. https://doi.org/10.1038/s41598-019-42412-6

Journal Article Type Article
Acceptance Date Mar 24, 2019
Online Publication Date Apr 18, 2019
Publication Date Apr 18, 2019
Deposit Date Apr 23, 2019
Publicly Available Date Apr 23, 2019
Journal Scientific Reports
Publisher Nature Research
Peer Reviewed Peer Reviewed
Volume 9
Issue 1
Article Number 6288
DOI https://doi.org/10.1038/s41598-019-42412-6

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.





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