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针尖-样品距离对扫描微波显微成像的影响分析

薛一凡，王采慧，裴 涛，温焕飞*
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2024年 第43卷 第3期:  1000-6281（2024）03-303-006     下载地址：

针尖-样品距离对扫描微波显微成像的影响分析

薛一凡，王采慧，裴  涛，温焕飞*

(中北大学仪器与电子学院仪器科学与动态测试教育部重点实验室，山西太原030051)

摘  要   随着芯片制备工艺的不断完善，半导体集成电路朝着小型化、集成化的方向不断发展，给近场微波成像技术带来了新的挑战。本文建立了探针-样品三维电磁耦合模型，并利用有限元数值分析法研究了探针针尖与样品之间的电磁相互作用。在不同探针-样品间距下，对硅基芯片表面结构进行扫描微波成像。成像结果与仿真结果相一致，随着针尖-样品间距的增加，扫描微波测试系统的灵敏度和分辨率降低。对于由原子力显微术结合微波测量技术发展而来的扫描微波显微镜的改进与产业化具有重大意义。

关键词   扫描微波显微镜；有限元法；电磁建模；针尖-样品间距

中图分类号：TH742       文献标识码：A        doi：10.3969/j.issn.1000-6281.2024.03.005

    

Analysis of the influence of needle tip sample distance on scanningmicrowave microscopy imaging

XUE Yifan，WANG Caihui，PEI Tao，WEN Huanfei*

(Key Laboratory of instrumental science and dynamic testing, Ministry of Education, School of Instrumentation and Electronics, North University of China, Taiyuan Shanxi 030051, China)

Abstract    With the continuous improvement of chip preparation process, semiconductor integrated circuits are being developed toward miniaturization and integration, which brings new challenges to the near-field microwave imaging technology. In this paper, a probe-sample three-dimensional electromagnetic coupling model was established. The electromagnetic interaction between probe tip and sample was investigated using finite element numerical analysis. Scanning microwave imaging of the surface structure of Si-based chip was performed at different probe-sample spacings. Imaging results were consistent with simulation results. The sensitivity and resolution of the scanning microwave test system decreased as the tip-sample spacing increased. It is of great significance for the improvement and industrialization of scanning microwave microscopy developed from the combination of atomic force microscopy and microwave measurement technology.

Keywords    scanning microwave microscope; finite element method; electromagnetic modeling; needle tip sample spacing

 

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