Ms. Jing Ma Profile

Jing Ma

at Guilin Univ of Electronic Technology

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Publications (2)

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Proceedings Article | 31 August 2021 Paper

Dual-band terahertz biosensor based on metamaterial absorber

Huan Liu, Jing Ma, Gui-Min Chen, Hai-Ling He, Ya-Xian Fan, Zhi-Yong Tao

Proceedings Volume 11907, 1190727 (2021) https://doi.org/10.1117/12.2603109

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Traditional biological detection methods in practical applications, such as polymerase chain reaction, fluorescence microscopy, flow cytometry and so on, are commonly limited by label needed, high cost, complex operation, low sensitivity. Fortunately, metamaterial-based terahertz (THz) biosensors have shown great potential in label-free, integrated chip and ultra-sensitive sensing due to their advantages in light collection and miniaturization. However, most of THz metamaterial biosensors are based on transmission spectrum measurement, the one-way transmission will lead to the weak interactions between analyte and THz wave, so the sensitivity will be greatly reduced. Here, we proposed a label-free dual-band THz biosensor with ultra-high sensitivity based on metamaterial absorber. The device consists of the asymmetric cross shaped metal metasurface, hollow sensing channel and a back reflector. The simulation results show that the two resonance modes are excited at 0.626 THz and 1.504 THz and the absorptivity is higher than 95%. With the increasing the refractive index of the analyte, the two absorption peaks have obvious red shift. The maximum sensitivities for mode A and mode B are up to 250 GHz/RIU and 630 GHz/RIU, respectively. By simulating the electromagnetic field distribution of the structure, the absorption sensing mechanism is discussed in detail. The proposed THz metamaterial biosensor exhibits promising applications in chemical and biological detection.

Proceedings Article | 2 December 2020 Paper

Tunable terahertz metasurface resonator based on phase transition of VO2 crosses

huan liu, Lin Li, Kun Zhang, Jing Ma, Gui-Min Chen, Ya-Xian Fan, Zhi-Yong Tao

Proceedings Volume 11717, 1171710 (2020) https://doi.org/10.1117/12.2585895

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Based on the insulator to metal transition (IMT) characteristics of vanadium dioxide (VO₂), a highly active tunable terahertz (THz) metasurface resonator patterned VO₂ cross structures is proposed. The simulation results show that the transmission of the proposed structure at low temperature is higher than 0.7 because of the VO₂ in its insulation phase. With the increasing temperature, a strong transmission dip appears at 0.76 THz due to the metal phase of VO₂, which indicates the onset of a new resonant mode. The maximum tunable range of transmission for THz wave is 0.06-0.86. Simultaneously, we also demonstrate that the resonant responses of the heating and cooling processes are quite different and the heating process is more sensitive. The transition temperature is close to room temperature and the device can achieve good modulation effect on both TE and TM waves. The TE and TM mode resonances are selective by altering the cross arms, which is almost impossible for other THz devices. So, the resonator can greatly promote practical applications of THz functional devices such as filters, sensors, modulators, and switches.

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