Journal
ACS PHOTONICS
Volume 5, Issue 2, Pages 371-377Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00334
Keywords
tunable metasurfaces; metal-insulator transition; phase change materials; vanadium dioxide
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Funding
- Air Force Office of Scientific Research [FA9550-16-1-0393, FA9550-12-1-0381]
- UC Office of the President Multicampus Research Programs and Initiatives [MR-15-328528]
- Vannevar Bush Faculty Fellowship program - Basic Research Office of the Assistant Secretary of Defense for Research and Engineering
- Office of Naval Research [N00014-15-1-2848]
- DoD, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship [32 CFR 168a]
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Nanophotonic resonators offer the ability to design nanoscale optical elements and engineered materials with unconventional properties. Dielectric-based resonators intrinsically support a complete multipolar resonant response with low absorption, while metallic resonators provide extreme light confinement and enhanced photon electron interactions. Here, we construct resonators out of a prototypical metal insulator transition material, vanadium dioxide (VO2), and demonstrate switching between dielectric and plasmonic resonances. We first characterize the temperature-dependent infrared optical constants of VO2 single crystals and thin-films. We then fabricate VO2 wire arrays and disk arrays. We show that wire resonators support dielectric resonances at low temperatures, a damped scattering response at intermediate temperatures, and plasmonic resonances at high temperatures. In disk resonators, however, upon heating, there is a pronounced enhancement of scattering at intermediate temperatures and a substantial narrowing of the phase transition. These findings may lead to the design of novel nanophotonic devices that incorporate thermally switchable plasmonic-dielectric behavior.
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