Dr. Haizi Yao Profile

Dr. Haizi Yao

at Huang Huai College

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Proceedings Article | 8 July 2022 Paper

Research on terahertz near-field probe based on surface plasmon polaritons

Chongwu Zhu, Xue Zhang, Haizi Yao

Proceedings Volume 12284, 1228408 (2022) https://doi.org/10.1117/12.2616495

KEYWORDS: Metals, Terahertz radiation, Near field, Surface plasmon polaritons, Electromagnetism, Electromagnetic radiation, Plasma, Optical properties, Electrons, Dielectrics

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A cylindrical metal tapered probe with a periodic sub-wavelength groove is studied in this paper. The surface plasmon polaritons (SPPs) is supported by periodic ring grooves on the surface of the metal line. To achieve enhancement of the electric field, the tapered tip is used to focus the surface waves tightly. The affection of the sub-wavelength microstructure parameters on the transmission loss and the enhancement factor of the electric field are compared. When the frequency of the electromagnetic field is low, the loss of the periodic grooved metal line negative correlates with the groove depth and width but positive correlates with the radius and the period. As the frequency increases, the correlation between the transmission loss of the metal line and the groove depth, width, radius, and the period reverse. Similar to the loss of the metal line, the field enhancement factor of the probe tip is also vulnerable to the frequency of the electromagnetic field. The field enhancement factor of the probe tip increases as the period decreases when the electromagnetic field frequency is low. In contrast, the field enhancement factor of the probe tip declines as the period decreases as the frequency increases. However, the field enhancement factor of the tip positive correlates with the groove depth and width but negative with the radius in the whole passband. The simulation result prove the feasibility of the proposed method and pave the way for the development of low-loss, miniaturized, low background noise, and high-focus electric field enhancement factor terahertz near-field probes.

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