Tunable hyperbolic metamaterials utilizing phase change heterostructures

Harish N.S. Krishnamoorthy, CUNY Queens College
You Zhou, Harvard University
Shriram Ramanathan, Harvard University
Evgenii Narimanov, Purdue University, Birck Nanotechnology Center
Vinod M. Menon, CUNY Queens College

Date of this Version



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.


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.


Nanoscience and Nanotechnology