title: Thermal tunability in terahertz metamaterials fabricated on strontium titanate single-crystal substrates.
abstract: We report an experimental demonstration of thermal tuning of resonance frequency in a planar terahertz metamaterial consisting of a gold split-ring resonator array fabricated on a bulk single-crystal strontium titanate (SrTiO₃) substrate. Cooling the metamaterial starting from 409 K down to 150 K causes about a 43% shift in resonance frequency, and there is very little variation in resonance strength. The resonance shift is due to the temperature-dependent dielectric constant of the strontium titanate. The experiment opens up avenues for designing tunable terahertz devices by exploiting the temperature-sensitive characteristic of high dielectric constant substrates and complex metal oxide materials.
authors.affiliation: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. ranjan@lanl.gov
authors.forename: Ranjan
authors.initials: R
authors.lastname: Singh
authors.forename: Abul K
authors.initials: AK
authors.lastname: Azad
authors.forename: Q X
authors.initials: QX
authors.lastname: Jia
authors.forename: Antoinette J
authors.initials: AJ
authors.lastname: Taylor
authors.forename: Hou-Tong
authors.initials: HT
authors.lastname: Chen