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Journal Article Gradual Tuning of the Terahertz Passband using a Square-loop Metamaterial based on a W-doped VO2 Thin Film
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Authors
Jun-Hwan Shin, Sang-Pil Han, Minhyup Song, Han-Cheol Ryu
Issue Date
2019-03
Citation
Applied Physics Express, v.12, no.3, pp.1-5
ISSN
1882-0778
Publisher
Japan Society of Applied Physics (JSAP), Institute of Physics (IOP)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.7567/1882-0786/ab0395
Abstract
An electrically controllable terahertz (THz) square-loop metamaterial based on tungsten (W)-doped vanadium dioxide (VO2) films was designed and evaluated. The structure acts as both the bandpass filter and micro-heater. The various W concentrated VO2 films used to integrate with the metamaterial were successfully grown through the sol-gel method. The transition temperature decreased by ~14 K/at% and the resistance-temperature hysteresis curves broadened with higher doping concentrations. By utilizing the designed device, the transmitted THz wave can be tuned precisely, and the modulation depth can reach up to 0.72 in the 0.3-0.7 THz passband with a bias voltage below 2 V.
KSP Keywords
Band-pass filter(BPF), Doping concentration, Hysteresis curves, Micro-heater, THz wave, Temperature hysteresis, W-doped, bias voltage, modulation depth, sol-gel method, thin film(TF)