Super-collimation and negative refraction in hyperbolic Van der Waals superlattices

• Main Authors: Sreekanth, Kandammathe Valiyaveedu, Simpson, Robert E.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics; Hyperbolic Metamaterials; THz Frequencies
• Online Access: https://hdl.handle.net/10356/143027
• Institution: Nanyang Technological University

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 observe...