Oriented asymmetric wave propagation and refraction bending in hyperbolic media

Macêdo, R. , Dumelow, T., Camley, R. E. and Stamps, R. L. (2018) Oriented asymmetric wave propagation and refraction bending in hyperbolic media. ACS Photonics, 5(12), pp. 5086-5094. (doi:10.1021/acsphotonics.8b01402)

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Abstract

Crystal quartz is a well-known anisotropic medium with optically active phonons in the THz region where hyperbolic phonon-polaritons can be excited. Here, we use this material to illustrate how the behavior of bulk and surface hyperbolic polaritons can be drastically modified by changing the orientation of the crystal’s anisotropy axis with respect to its surface. We demonstrate, both theoretically and experimentally, phenomena associated with the orientation of hyperbolic media. We show the consequences of changes in the crystal’s orientation in various ways, such as the modification of the effective reststrahl regions and associated surface phonon polariton dispersion. Of particular significance, however, is the transmission behavior of radiation passing through a rotated hyperbolic crystal. Here, even a small rotation of the optical axes with respect to the crystal surface can lead to a very large degree of asymmetry in the transmitted intensity. In addition, the refracting angle (which in a hyperbolic medium may correspond to negative refraction and slab lensing behavior) itself becomes asymmetric, so that a slab lens with a laterally displaced image becomes possible. We discuss some of the possible consequences of these types of effects.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stamps, Professor Robert and Macedo, Dr Rair
Authors: Macêdo, R., Dumelow, T., Camley, R. E., 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:2330-4022
ISSN (Online):2330-4022
Published Online:28 November 2018
Copyright Holders:Copyright © 2018 American Chemical Society
First Published:First published in ACS Photonics 5(12):5086-5094
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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