ph7b00334_si_001.zip (154.24 kB)
Switchable Plasmonic–Dielectric Resonators with Metal–Insulator Transitions
dataset
posted on 2017-10-30, 00:00 authored by Nikita
A. Butakov, Ilya Valmianski, Tomer Lewi, Christian Urban, Zhensong Ren, Alexander A. Mikhailovsky, Stephen D. Wilson, Ivan K. Schuller, Jon A. SchullerNanophotonic 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.