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dc.contributor.authorLoughran, THJ
dc.contributor.authorRoth, J
dc.contributor.authorKeatley, PS
dc.contributor.authorHendry, E
dc.contributor.authorBarnes, WL
dc.contributor.authorHicken, RJ
dc.contributor.authorEinsle, JF
dc.contributor.authorAmy, A
dc.contributor.authorHendren, W
dc.contributor.authorBowman, RM
dc.contributor.authorDawson, P
dc.date.accessioned2018-06-05T12:25:52Z
dc.date.issued2018-05-01
dc.description.abstractThe design and fabrication of a novel plasmonic cavity, intended to allow far-field recovery of signals arising from near field magneto-optical interactions, is presented. Finite element modeling is used to describe the interaction between a gold film, containing cross-shaped cavities, with a nearby magnetic under-layer. The modeling revealed strong electric field confinement near the center of the cross structure for certain optical wavelengths, which may be tuned by varying the length of the cross through a range that is compatible with available fabrication techniques. Furthermore, the magneto optical Kerr effect (MOKE) response of the composite structure can be enhanced with respect to that of the bare magnetic film. To confirm these findings, cavities were milled within gold films deposited upon a soluble film, allowing relocation to a ferromagnetic film using a float transfer technique. Cross cavity arrays were fabricated and characterized by optical transmission spectroscopy prior to floating, revealing resonances at optical wavelengths in good agreement with the finite element modeling. Following transfer to the magnetic film, circular test apertures within the gold film yielded clear magneto-optical signals even for diameters within the sub-wavelength regime. However, no magneto-optical signal was observed for the cross cavity arrays, since the FIB milling process was found to produce nanotube structures within the soluble under-layer that adhered to the gold. Further optimization of the fabrication process should allow recovery of magneto-optical signal from cross cavity structures.en_GB
dc.description.sponsorshipFinancial support from the UK Engineering and Physical Science Research Council (EPSRC) grants EP/1038470/I and EP/1038411/1 is gratefully acknowledged. We also acknowledge the support of Seagate Technology (Ireland) under SOW 00077300.0. RMB contribution to project was supported by the Royal Academy of Engineering under the Research Chairs and Senior Research Fellowships Scheme.en_GB
dc.identifier.citationVol. 8 (5), article 055207.en_GB
dc.identifier.doi10.1063/1.5021538
dc.identifier.urihttp://hdl.handle.net/10871/33084
dc.language.isoenen_GB
dc.publisherAIP Publishingen_GB
dc.relation.sourceThe research materials supporting this publication can be publicly accessed in the open research Exeter (ORE) repository via the following persistent identifier: https://doi.org/10.24378/exe.309.en_GB
dc.relation.urlhttp://hdl.handle.net/10871/32604
dc.rights© 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5021538.en_GB
dc.titleDesign and fabrication of plasmonic cavities for magneto-optical sensing (article)en_GB
dc.typeArticleen_GB
dc.date.available2018-06-05T12:25:52Z
dc.descriptionThis is the author accepted manuscript. The final version is available from AIP Publishing via the DOI in this record.en_GB
dc.descriptionThe dataset associated with this article is located in ORE at: http://hdl.handle.net/10871/32604
dc.identifier.eissn2158-3226
dc.identifier.journalAIP Advancesen_GB


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