[論文レビュー] 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被引用数 0

ひとこと要約

The paper develops a metal-dielectric metasurface unit cell to enhance sensitivity for measuring IgG concentration in aqueous solutions, combining experiments and COMSOL modeling. It identifies the four-resonator unit cell as optimal for detecting concentration-induced changes.

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.

研究の動機と目的

• Develop a metal-dielectric sensor structure for IgG concentration detection in aqueous solutions.
• experimentally determine complex permittivity changes with IgG concentration using microwave dielectrometry.
• Model and optimize the metasurface unit cell geometry to maximize sensor sensitivity.
• Integrate the metasurface with a standard 96-well microplate for practical laboratory use.

提案手法

• Experimentally measured complex permittivity of IgG-water solutions at microwave frequencies using a microwave dielectrometer setup.
• Numerical modeling of the microwave metal-dielectric metasurface unit cell in COMSOL, using the experimental CP data as input.
• Systematic optimization of unit cell geometry, focusing on size and position of copper microresonators within the unit cell.
• Assessment of sensor sensitivity via the frequency shift of the reflection coefficient.
• Calibration graph development for IgG concentration determination.

実験結果

リサーチクエスチョン

• RQ1 How does IgG concentration affect the complex permittivity of aqueous solutions at microwave frequencies?
• RQ2 How can the unit cell geometry of a metal-dielectric metasurface be optimized to maximize sensitivity to IgG concentration changes?
• RQ3 What unit cell configuration provides the strongest correlation between IgG concentration and measurable microwave response?
• RQ4 Can the metasurface be integrated with standard laboratory equipment (e.g., 96-well plates) for practical IgG sensing?

主な発見

• Increase in IgG concentration leads to decreasing complex permittivity values in the tested solutions.
• The metasurface unit cell with four copper microresonators yielded the highest sensor sensitivity among configurations tested.
• The frequency shift of the reflection coefficient correlates with IgG concentration changes.
• A calibration graph was developed to enable effective IgG concentration determination in aqueous solutions.