Journal
CHINESE PHYSICS B
Volume 28, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/28/5/054203
Keywords
tunable band-pass filter; hybrid metamaterials; terahertz; vanadium dioxide (VO2)
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Funding
- National Natural Science Foundation of China [11574059, 61565004, 11774288]
- National Technology Major Special Project, China [2017ZX02101007-003]
- Natural Science Foundation of Guangxi, China [2015GXNSFDA139039, 2017GXNSFBA198116]
- Guangxi Key Laboratory of Automatic Detection Technology and Instrument, China [YQ16101]
- Innovation Project of Guangxi Graduate Education, China [2018YJCX70, 2018YJCX67, 2018YJCX74]
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We experimentally demonstrate an electrically triggered terahertz (THz) dual-band tunable band-pass filter based on Si3N4-VO2-Si3N4 sandwich-structured hybrid metamaterials. The insulator-metal phase transition of VO2 film is induced by the Joule thermal effect of the top metal layer. The finite-integration-time-domain (FITD) method and finite element method (FEM) are used for numerical simulations. The sample is fabricated using a surface micromachining process, and characterized by a THz time-domain-spectrometer (TDS). When the bias current is 0.225 A, the intensity modulation depths at two central frequencies of 0.56 THz and 0.91 THz are about 81.7% and 81.3%, respectively. This novel design can achieve dynamically electric-thermo-optic modulation in the THz region, and has potential applications in the fields of THz communications, imaging, sensing, and astronomy exploration.
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