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 () substrate. Cooling the metamaterial starting from down to 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.
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