In this paper, we present a design technique to realize reconfigurable terahertz (THz) frequency selective surface (FSS) polarizer. Our approach relies on combining vanadium dioxide (VO2) patches with metallic resonators. Vanadium dioxide behaves as an insulator at room temperatures and as a metal at high temperatures with a characteristic insulator-metal transition temperature of ̃68 °C. We used this attribute to realize a reconfigurable single- to dual-polarized bandpass FSS structure at 0.5 THz. Along with the simulation results, FSS structures fabricated on sapphire substrates were measured using THz time-domain spectroscopy. Measured extinction ratio of ̃25 dB was achieved for the THz polarizer with just a single FSS layer. Good agreement between simulation and experiments were obtained.
- Bandpass filters
- Frequency selective surfaces
- Reconfigurable terahertz structures
- Vanadium dioxide