Tunable hyperbolic metamaterials utilizing phase change heterostructures
Date of this Version
3-24-2014Abstract
We present a metal-free tunable anisotropic metamaterial where the iso-frequency surface is tuned from elliptical to hyperbolic dispersion by exploiting the metal-insulator phase transition in the correlated material vanadium dioxide (VO2). Using VO2-TiO2 heterostructures, we demonstrate the transition in the effective dielectric constant parallel to the layers to undergo a sign change from positive to negative as the VO2 undergoes the phase transition. The possibility to tune the iso-frequency surface in real time using external perturbations such as temperature, voltage, or optical pulses creates new avenues for controlling light-matter interaction. (C) 2014 AIP Publishing LLC.
Discipline(s)
Nanoscience and Nanotechnology
Comments
This is the publisher PDF of Krishnamoorthy, HNS; Zhou, Y; Ramanathan, S; Narimanov, E; and Menon, VM. "Tunable hyperbolic metamaterials utilizing phase change heterostructures." Applied Physics Letters 104, 121101. 2014. Copyright AIP, it is available at http://dx.doi.org/10.1063/1.4869297.