A tunable metamaterial dependent on electric field at terahertz with barium strontium titanate thin film

A tunable metamaterial with resonance frequency at terahertz (THz) was developed. Electromagnetic response of the metamaterial was characterized with THz time domain spectrometer at various direct current electric fields. The resonance frequency increased monotonously with increasing electric field. The finite difference time domain method was used to simulate the transmission spectra of the metamaterial at THz frequencies. By comparing the simulated resonance frequency with the experimental curve, dielectric property of the Ba0.6Sr0.4TiO3 (BST60) thin film at THz, over 0-33 kV/cm, was evaluated. (C) 2014 AIP Publishing LLC.