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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Published inScientific reports Vol. 7; no. 1; pp. 12019 - 6
Main Authors Gupta, Barun, Pandey, Shashank, Nahata, Anjali, Sensale-Rodriguez, Berardi, Guruswamy, Sivaraman, Nahata, Ajay
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 20.09.2017
Nature Publishing Group
Subjects
140/125
639/624/400/1021
639/766/400/561
Aperture
Arrays
Cobalt
Dielectric properties
Electric fields
Geometry
Gold
Heavy metals
Humanities and Social Sciences
Magnetic fields
Metals
multidisciplinary
Propagation
Radiation
Science
Stainless steel
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Summary: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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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-12369-5