Tunable focusing in natural hyperbolic magnetic media

Macêdo, R. , Dumelow, T. and Stamps, R. L. (2016) Tunable focusing in natural hyperbolic magnetic media. ACS Photonics, 3(9), pp. 1670-1677. (doi: 10.1021/acsphotonics.6b00321)

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While optical effects such as negative refraction and imaging obtained from slab lenses with plane parallel sides are widely studied using metamaterials, it is less well known that these effects can occur naturally in certain materials. We discuss a class of natural hyperbolic materials that not only display similar effects but also allow one to modify the focal length of a slab lens with an externally applied magnetic field. This is possible because antiferromagnets are gyrotropic and support magnetic polaritons whose frequencies are sensitive to magnetic fields. In addition, a rich caustic structure emerges at low temperatures, when damping should be small. These materials also produce slab focusing at higher temperatures, although the caustic structure disappears.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Stamps, Professor Robert and Macedo, Dr Rair
Authors: Macêdo, R., Dumelow, T., and Stamps, R. L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:ACS Photonics
Publisher:American Chemical Society
ISSN (Online):2330-4022
Published Online:16 August 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in ACS Photonics 3(9):1670-1677
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
683531Consortium for advanced materials based on spin chiralityRobert StampsEngineering & Physical Sciences Research Council (EPSRC)EP/M024423/1S&E P&A - PHYSICS & ASTRONOMY