期刊
APPLIED PHYSICS LETTERS
卷 104, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4869297
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资金
- MRSEC Program of the National Science Foundation [DMR 1120923]
- NSF [DMR-0952794]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- City University of New York Provost's dissertation fellowship
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.
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