Emergent asymmetries and enhancement in the absorption of natural hyperbolic crystals

Wu, X., McEleney, C. A., González-Jiménez, M. and Macêdo, R. (2019) Emergent asymmetries and enhancement in the absorption of natural hyperbolic crystals. Optica, 6(12), pp. 1478-1483. (doi: 10.1364/OPTICA.6.001478)

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The effects of the anisotropy orientation in hyperbolic media have only recently emerged as a way to control and manipulate several optical effects. Here, we show from both experimental and theoretical evidence that highly oriented-asymmetric absorption can be induced in simple crystal quartz. This can be achieved by controlling the orientation of the anisotropy with respect to the surface of the crystal at infrared regions where crystal quartz behaves as a hyperbolic medium. What is perhaps most intriguing here is that not only is the absorption asymmetric, but it can also be significantly enhanced. Finally, we also show various mechanisms through which the asymmetry in the absorption can be optimized, such as controlling the thickness of the crystal. Such phenomena are key for directional-dependent optical devices and present a pathway for engineering angle-encoded detection and sensing.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Macedo, Dr Rair
Authors: Wu, X., McEleney, C. A., González-Jiménez, M., and Macêdo, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optica
Publisher:Optical Society of America
ISSN (Online):2334-2536
Published Online:25 November 2019
Copyright Holders:Copyright © 2019 Optical Society of America
First Published:First published in Optica 6(12): 1478-1483
Publisher Policy:Reproduced under a Creative Commons License

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