Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays

We characterize the terahertz (THz) magneto-plasmonic response of a cobalt-based periodic aperture array. The bare cobalt surface allows for low loss propagation of surface plasmon-polaritons, as evidenced by comparing the reflection from aperture arrays coated with Au and with Co. When an external...

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Autores principales: Gupta, Barun, Pandey, Shashank, Nahata, Anjali, Sensale-Rodriguez, Berardi, Guruswamy, Sivaraman, Nahata, Ajay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5607252/
https://www.ncbi.nlm.nih.gov/pubmed/28931911
http://dx.doi.org/10.1038/s41598-017-12369-5
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author Gupta, Barun
Pandey, Shashank
Nahata, Anjali
Sensale-Rodriguez, Berardi
Guruswamy, Sivaraman
Nahata, Ajay
author_facet Gupta, Barun
Pandey, Shashank
Nahata, Anjali
Sensale-Rodriguez, Berardi
Guruswamy, Sivaraman
Nahata, Ajay
author_sort Gupta, Barun
collection PubMed
description We characterize the terahertz (THz) magneto-plasmonic response of a cobalt-based periodic aperture array. The bare cobalt surface allows for low loss propagation of surface plasmon-polaritons, as evidenced by comparing the reflection from aperture arrays coated with Au and with Co. When an external magnetic field is applied in a polar Kerr geometry, we observe a maximum polarization rotation of ~0.6° and an ellipticity of ~0.35° from the Co-based array. These values are larger than expected based on existing models that include only interband transitions in ferromagnetic metals. We discuss possible reasons for the difference between experiment and theory.
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spelling pubmed-56072522017-09-24 Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays Gupta, Barun Pandey, Shashank Nahata, Anjali Sensale-Rodriguez, Berardi Guruswamy, Sivaraman Nahata, Ajay Sci Rep Article We characterize the terahertz (THz) magneto-plasmonic response of a cobalt-based periodic aperture array. The bare cobalt surface allows for low loss propagation of surface plasmon-polaritons, as evidenced by comparing the reflection from aperture arrays coated with Au and with Co. When an external magnetic field is applied in a polar Kerr geometry, we observe a maximum polarization rotation of ~0.6° and an ellipticity of ~0.35° from the Co-based array. These values are larger than expected based on existing models that include only interband transitions in ferromagnetic metals. We discuss possible reasons for the difference between experiment and theory. Nature Publishing Group UK 2017-09-20 /pmc/articles/PMC5607252/ /pubmed/28931911 http://dx.doi.org/10.1038/s41598-017-12369-5 Text en © The Author(s) 2017 https://creativecommons.org/licenses/by/4.0/Open Access 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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Gupta, Barun
Pandey, Shashank
Nahata, Anjali
Sensale-Rodriguez, Berardi
Guruswamy, Sivaraman
Nahata, Ajay
Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
title Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
title_full Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
title_fullStr Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
title_full_unstemmed Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
title_short Terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
title_sort terahertz magneto-plasmonics using cobalt subwavelength aperture arrays
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5607252/
https://www.ncbi.nlm.nih.gov/pubmed/28931911
http://dx.doi.org/10.1038/s41598-017-12369-5
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