Ms. Xiaoting Wu Profile

Xiaoting Wu

at Yunnan Normal Univ

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Publications (2)

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Proceedings Article | 24 November 2021 Paper

Switchable narrowband THz metasurface filter based on vanadium dioxide

Chi Liu, Wei Wang, Xiaoting Wu, Songyuan Yang, Rui He

Proceedings Volume 12061, 120610N (2021) https://doi.org/10.1117/12.2603990

KEYWORDS: Terahertz radiation, Vanadium, Bandpass filters

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A switchable narrowband THz metasurface filter based on vanadium dioxide (VO₂) is demonstrated which can be switched between the “ON” and “OFF” state by applying a bias current to VO2. In the initial “ON” state without applying the bias current, the transmittance of the filter is greater than 80% from 0.72 to 0.78 THz and reaches a maximum of 92% at the center frequency of 0.75 THz. After applying 300 mA current to VO2, the filter is in the “OFF” state and the transmittance is almost zero over the entire frequency range from 0.4 to 1.1 THz. Furthermore, considering the influence of the substrate thickness of the filter on the actual application of the device, the response of the filter with different thicknesses of the substrate is numerically simulated, and the results show that the filter performance is still good when the thickness of the substrate increases to 500 μm.

Proceedings Article | 24 November 2021 Paper

Adjustable electromagnetically induced transparency based on terahertz metamaterial embedded with vanadium dioxide

Xiaoting Wu, Wei Wang, Chi Liu, Ying Zhang, Yide Sun

Proceedings Volume 12061, 120610C (2021) https://doi.org/10.1117/12.2602352

KEYWORDS: Metamaterials, Terahertz radiation, Metals, Resonators, Transparency, Vanadium, Near field, Terahertz metamaterials

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An adjustable electromagnetically induced transparency (EIT) metamaterial embedded with vanadium dioxide (VO₂) is demonstrated at terahertz (THz) region. The unit cell of metamaterial consists of a quartz substrate and two parallel wire metal resonators with different length on top layer. The two ends of the shorter wire metal resonator are filled with VO₂. The short wire metal resonator (SWMR) and the long wire metal resonator (LWMR) are acted as bright mode, which can be directly coupled with the incident THz wave to produce the EIT. Due to the insulator-to-metal transition of VO₂, the amplitude of EIT peak can be actively modulated and the modulation is implemented only in the EIT window with slight changes in transmission dips. When VO₂ is transformed from the insulating phase to the metallic phase with the conductivity changed from 2×10² S/m to 2×10⁵ S/m, the amplitude of the EIT peak can decrease from 0.91 to 0.03, which indicates that the EIT metamaterial achieves a large modulation depth. The physical mechanism of this phenomenon is explained by the magnetic field and current distributions. In addition, it is found that the slow-light effect gradually weakens and disappears with VO₂ changing from the insulating phase to the metallic phase. This work provides a strategy to achieve an adjustable EIT effect in THz metamaterial structure embedded with VO₂and exhibits potential applications in THz modulators and slow-light devices.

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