Electrically Triggered Tunable Terahertz Band-Pass Filter Based on VO2 Hybrid Metamaterial

We demonstrate an electrically triggered tunable terahertz (THz) band-pass filter based on vanadium dioxide (VO 2 ) embedded hybrid metamaterials. The unit cell of the filter consists of two cross resonators and a central bar. The phase transition of VO 2 is induced by the ohmic heating of the centr...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2019-05, Vol.25 (3), p.1-7
Main Authors: Hu, Fangrong, Wang, He, Zhang, Xiaowen, Xu, Xinlong, Jiang, Wenying, Qi Rong, Zhao, Shuai, Jiang, Mingzhu, Zhang, Wentao, Han, Jiaguang
Format: Article
Language:English
Subjects:
Band-pass filters
Bandpass filters
Bars
Conductivity
electrically triggered
hybrid metamaterials
Metamaterials
Modulation
Optical filters
Phase transitions
Resonator filters
Spectroscopy
Spectrum analysis
Terahertz (THz)
Terahertz frequencies
Thin films
Time domain analysis
tunable band-pass filter
Unit cell
Vanadium dioxide
vanadium dioxide (VO<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX"> _{2}</tex-math> </inline-formula>)
Vanadium oxides
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Summary:We demonstrate an electrically triggered tunable terahertz (THz) band-pass filter based on vanadium dioxide (VO 2 ) embedded hybrid metamaterials. The unit cell of the filter consists of two cross resonators and a central bar. The phase transition of VO 2 is induced by the ohmic heating of the central bar. The transmission can be modulated by the applied currents. The mechanism of tunability is that the conductivity of the VO 2 film changes with the applied currents. The relation between the upper cut-off frequency and the geometries is investigated using finite integration time domain method. The sample is fabricated by a thin film process, and characterized using a THz time domain spectroscopy system. The results show that, when the bias current rises from 0 to 0.27 A, the transmission decreases from 0.85 to 0.01. The maximum modulation depth reaches 96%, and the full width at half maximum is about 0.44 THz. This tunable THz band-pass filter has potential applications in THz communication, imaging, and spectroscopy systems.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2018.2885476