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Electrically triggered dual-band tunable terahertz metamaterial band-pass filter based on Si_3N_4–VO_2–Si_3N_4 sandwich

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Chinese Physics B 2019年第5期28卷 111-116页

作者： Shuai Zhao Fangrong Hu Xinlong Xu Mingzhu Jiang Wentao Zhang Shan Yin Wenying Jiang Guangxi Key Laboratory of Optoelectronic Information Processing Guilin University of Electronic Technology nanobiophotonic center State Key Laboratory Incubation Base of Photoelectric Technology and Functional Materials and Institute of Photonics &Photon-Technology Northwest University

We experimentally demonstrate an electrically triggered terahertz(THz) dual-band tunable band-pass filter based on Si_3 N_4–VO_2–Si_3 N_4 sandwich-structured hybrid metamaterials. The insulator–metal phase transition of VO_2 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.

关键词： tunable band-pass filter hybrid metamaterials terahertz vanadium dioxide (VO2)

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Mechanically tunable metamaterials terahertz dual-band bandstop filter

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Chinese Physics B 2017年第7期26卷 183-187页

作者：胡放荣胥欣李鹏徐新龙王月娥 Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing Guilin University of Electronic Technology Guangxi Experiment center of Information Science Guilin University of Electronic Technology nanobiophotonic center State Key Laboratory Incubation Base of Photoelectric Technology and Functional Materialsand Institute of Photonics & Photon-Technology Northwest University

We experimentally demonstrate a mechanically tunable metamaterials terahertz（THz） dual-band bandstop filter. The unit cell of the filter contains an inner aluminum circle and an outside aluminum Ohm-ring on high resistance silicon substrate. The performance of the filter is simulated by finite-integration-time-domain（FITD） method. The sample is fabricated using a surface micromachining process and experimentally demonstrated using a THz time-domain-spectroscopy（TDS） system. The results show that, when the incident THz wave is polarized in y-axis, the filter has two intensive absorption peaks locating at 0.71 THz and 1.13 THz, respectively. The position of the high-frequency absorption peak and the amplitude of the low-frequency absorption peak can be simultaneously tuned by rotating the sample along its normal *** tunability of the high-frequency absorption peak is due to the shift of resonance frequency of two electrical dipoles,and that of the low-frequency absorption peak results from the effect of rotationally induced transparent. This tunable filter is very useful for switch, manipulation, and frequency selective detection of THz beam.

关键词： metamaterials terahertz(THz) bandstop filter mechanically tunable rotationally induced transparent(RIT)

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