Tunable VO2/Au Hyperbolic Metamaterial
Journal Article - Open Access
MASSACHUSETTS INST OF TECH LEXINGTON LEXINGTON United States
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Vanadium dioxide VO2 is known to have a semiconductor-to-metal phase transition at 68C. Therefore, it can be used as a tunable component of an active metamaterial. The lamellar metamaterial studied in this work is composed of subwavelength VO2 and Au layers and is designed to undergo a temperature controlled transition from the optical hyperbolic phase to the metallic phase. VO2 films and VO2Au lamellar metamaterial stacks have been fabricated and studied in electrical conductivity and optical transmission and reflection experiments. The observed temperature-dependent changes in the reflection and transmission spectra of the metamaterials and VO2 thin films are in a good qualitative agreement with theoretical predictions. The demonstrated optical hyperbolic-to-metallic phase transition is a unique physical phenomenon with the potential to enable advanced control of light-matter interactions.
- Metallurgy and Metallography
- Electrical and Electronic Equipment