Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Thin Films Tuesday Sessions
       Session TF-TuP

Paper TF-TuP24
Active Multiband Terahertz Metamaterial Spatial Filters Based on Vanadium Dioxide Thin Films

Tuesday, December 9, 2014, 4:00 pm, Room Mauka

Session: Thin Films Poster Session
Presenter: Han-Cheol Ryu, Sahmyook University, Republic of Korea
Authors: H.-C. Ryu, Sahmyook University, Republic of Korea
J.-H. Shin, ETRI
K.H. Park, ETRI
Correspondent: Click to Email
This work presents the design, fabrication and terahertz performance of active multiband metamaterial spatial filters based on vanadium dioxide (VO2) thin films. VO2 thin films were deposited on Al2O3 (0001) substrates by the pulsed laser deposition method. Epitaxial relations between VO2 thin films and Al2O3 (0001) substrates were investigated using X-ray diffraction measurement and transmission electron microscopy observations. The multiband terahertz metamaterial spatial filters, which are artificial electromagnetic structures, can manipulate electromagnetic response at desired frequency bands. They were designed by electromagnetic simulator and fabricated on VO2 thin films which are phase transition materials due to their insulator-metal transition at a critical temperature. The terahertz characteristics of the fabricated active filters were controlled by electric bias or temperature variation. The tunable frequency responses of the devices were measured by using terahertz time-domain spectroscopy (THz-TDS) system. The measured tunable characteristics of the active terahertz filters based on VO2 thin films clearly show the possibility for the various tunable terahertz applications such as modulators, filters, and sensors.