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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Klein AK,Basden A,Hammler J,Tyas L,Cooke M,Balocco C,Zeze D,Girkin JM,Gallant Adoi
10.1038/s41598-019-42412-6subject
Has Abstractpub_date
2019-04-18 00:00:00pages
6288issue
1issn
2045-2322pii
10.1038/s41598-019-42412-6journal_volume
9pub_type
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