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Sensors 2018, 18(11), 3848; https://doi.org/10.3390/s18113848

THz Sensing With Anomalous Extraordinary Optical Transmission Hole Arrays

1
Antennas Group-TERALAB, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
2
Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk Branch “TDIAM”, Lavrentiev Ave. 2/1, 630090 Novosibirsk, Russia
3
Novosibirsk State University, Pirogova St. 2, 630090 Novosibirsk, Russia
4
Institute of Automation and Electrometry SB RAS, Koptyug Ave. 1, 630090 Novosibirsk, Russia
5
Institute of Smart Cities Campus Arrosadía, 31006 Pamplona, Spain
*
Author to whom correspondence should be addressed.
Received: 1 October 2018 / Revised: 5 November 2018 / Accepted: 6 November 2018 / Published: 9 November 2018
(This article belongs to the Special Issue Resonator Sensors 2018)
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Abstract

Subwavelength hole array (HA) metasurfaces support the so-called extraordinary optical transmission (EOT) resonance that has already been exploited for sensing. In this work, we demonstrate the superior performance of a different resonant regime of HA metasurfaces called anomalous EOT, by doing a thorough numerical and experimental study of its ability in thin-film label-free sensing applications in the terahertz (THz) band. A comprehensive analysis using both the regular and anomalous EOT resonances is done by depositing thin layers of dielectric analyte slabs of different thicknesses on the structures in different scenarios. We carry out a detailed comparison and demonstrate that the best sensing performance is achieved when the structure operates in the anomalous EOT resonance and the analyte is deposited on the non-patterned side of the metasurface, improving by a factor between 2 and 3 the results of the EOT resonance in any of the considered scenarios. This can be explained by the comparatively narrower linewidth of the anomalous EOT resonance. The results presented expand the reach of subwavelength HAs for sensing applications by considering the anomalous EOT regime that is usually overlooked in the literature. View Full-Text
Keywords: metasurface; sensing; thin film; terahertz; anomalous EOT metasurface; sensing; thin film; terahertz; anomalous EOT
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jáuregui-López, I.; Rodriguez-Ulibarri, P.; Kuznetsov, S.A.; Nikolaev, N.A.; Beruete, M. THz Sensing With Anomalous Extraordinary Optical Transmission Hole Arrays. Sensors 2018, 18, 3848.

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