@article {625930,
	title = {A mid-infrared biaxial hyperbolic van der Waals crystal},
	journal = {arXiv:1809.03432},
	year = {2018},
	abstract = {Hyperbolic media have attracted much attention in the photonics community, thanks to their ability to confine light to arbitrarily small volumes and to their use for super-resolution applications. The 2D counterpart of these media can be achieved with hyperbolic metasurfaces, which support in-plane hyperbolic guided modes thanks to nanopatterns which, however, pose significant fabrication challenges and limit the achievable confinement. We show that thin flakes of the van der Waals material α-MoO3 can support naturally in-plane hyperbolic polariton guided modes at mid-infrared frequencies without any patterning. This is possible because α-MoO3 is a biaxial hyperbolic crystal, with three different Restrahlen bands, each for a different crystal axis. Our findings can pave the way towards new paradigm to manipulate and confine light in planar photonic devices.},
	url = {https://arxiv.org/abs/1809.03432},
	author = {Zebo Zheng and Ningsheng Xu and Oscurato, Stefano Luigi and Tamagnone, Michele and Fengsheng Sun and Yinzhu Jiang and Yanlin Ke and Chen, Jianing and Wuchao Huang and William L. Wilson and Ambrosio, Antonio and Shaozhi Deng and Huanjun Chen}
}
