[论文解读] Optimization of the metal-dielectric metasurface unit cell for sensitivity enhancement in determination of IgG concentration in solutions

K. S. Kuznetsova, V. A. Pashynska+1 more|arXiv (Cornell University)|Jan 9, 2026

Microwave and Dielectric Measurement Techniques被引用 0

一句话总结

该论文开发了一种金属-介质超表面单元结构，以增强对水溶液中IgG浓度测量的灵敏度，结合实验与COMSOL建模。它确定四个谐振器单元在检测浓度引起的变化时最优。

ABSTRACT

This study focuses on developing a metal-dielectric sensor structure with optimized unit cell geometry for determination of protein Immunoglobulin G (IgG) concentration in aqueous solutions. The research combines both experimental and theoretical investigations, utilizing the differential microwave dielectrometry method and numerical modeling with COMSOL software. Complex permittivity (CP) values dependence of IgG water solutions on the protein concentration was experimentally obtained at the microwaves using original microwave dielectrometer setup. It was shown that increase of IgG concentration resulted in the CP values of the solutions studied decrease. The experimentally obtained CP data for the IgG water solutions were used as a basis for microwave metal-dielectric metasurface unit cell numerical modeling. The metal-dielectric metasurface consisting of Teflon substrate and plane copper microresonators was combined with a standard 96-well microplate used in clinical laboratories. Optimization of the obtained metasurface unit cell revealed that the size and position of the copper microresonators within the unit cell significantly impact the sensor sensitivity for determining the IgG concentration in aqueous solutions. The metasurface with the unit cell containing four copper microresonators provided the most sensitive platform for detecting variations in the IgG concentration in the sample. The frequency shift of the reflection coefficient was directly related to changes in the protein concentration. The calibration graph was developed for effective determination of IgG concentrations in the aqueous solutions.

研究动机与目标

• 为IgG在水溶液中检测浓度开发金属-介质传感结构。
• 使用微波介电测量法实验确定IgG浓度随极化率的复数变化。
• 对超表面单元几何进行建模与优化，以最大化传感灵敏度。
• 将超表面与标准96孔微板集成以实现实际实验室应用。

提出的方法

• 使用微波介质测定仪在微波频段实验测量IgG-水溶液的复数介电常数。
• 在COMSOL中对微波金属-介质超表面单元进行数值建模，输入采用实验得到的CP数据。
• 对单元几何进行系统化优化，重点关注单元内铜微谐振器的尺寸与位置。
• 通过反射系数频率漂移来评估传感灵敏度。
• 为IgG浓度测定建立标定图。

实验结果

研究问题

• RQ1 IgG浓度在微波频段如何影响水溶液的复数介电常数？
• RQ2 如何优化金属-介质超表面单元几何以最大化对IgG浓度变化的灵敏度？
• RQ3 哪种单元配置能在IgG浓度与可测微波响应之间提供最强相关？
• RQ4 该超表面能否与标准实验设备（如96孔板）集成用于实用IgG传感？

主要发现

• 在测试的溶液中，IgG浓度提高导致复数介电常数值下降。
• 具有四个铜微谐振器的超表面单元在所测试的配置中显示出最高的传感灵敏度。
• 反射系数的频率漂移与IgG浓度变化相关。
• 建立了标定图以实现对水溶液中IgG浓度的有效测定。