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Title: Super-collimation and negative refraction in hyperbolic Van der Waals superlattices
Authors: Sreekanth, Kandammathe Valiyaveedu
Simpson, Robert E.
Keywords: Science::Physics
Issue Date: 2019
Source: Sreekanth, K. V., & Simpson, R. E. (2019). Super-collimation and negative refraction in hyperbolic van Der waals superlattices. Optics Communications, 440, 150-154. doi:10.1016/j.optcom.2019.02.020
Journal: Optics Communications
Abstract: In this paper, we investigate supercollimation and negative group refraction properties of Van der Waals crystals. Van der Waals crystals, such as Bi 2 Se 3 , show both type I and type II hyperbolic dispersion at terahertz (THz) frequencies. An all angle negative group index of refraction is observed at frequencies that exhibit type I hyperbolic dispersion. However, a negative group index of refraction is observed at higher angles in the type II spectral region. The supercollimation effect is achieved at the inversion point of type II and the Reststrahlen band, where the resonance cone angle is close to zero. We further show broadband tunable hyperbolic dispersion from THz to mid infrared frequencies and a widening of the negative group index spectral band using topological insulator–dielectric insulator based superlattice structures.
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2019.02.020
Schools: School of Physical and Mathematical Sciences 
Organisations: Centre for Disruptive Photonic Technologies
The Photonic Institute
Rights: © 2019 Elsevier B.V. All rights reserved. This paper was published in Optics Communications and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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