Engraved Microwave Metasurfaces for Potential Application in Honey Quality Control

Area of Science:

• Metasurfaces and metamaterials
• Electromagnetic sensing technologies
• Food quality control

Background:

• Honey quality control is crucial for consumer safety and market integrity.
• Existing spectroscopic techniques for honey analysis can be complex and costly.
• Development of novel, efficient, and cost-effective sensing methods is needed.

Purpose of the Study:

• To investigate the potential of millimeter-scale metasurfaces as sensors for honey quality control.
• To evaluate the electromagnetic response of complementary split-ring resonator metasurfaces to different honey types and adulterants.
• To compare the performance of metasurface sensors with established spectroscopic methods.

Main Methods:

• Fabrication of complementary split-ring resonator metasurfaces using Computer Numerical Control (CNC) engraving.
• Measurement of metasurface resonance frequencies under unloaded conditions (3-6 GHz).
• Analysis of the electromagnetic response of metasurfaces in the presence of various honey types (chestnut, pine, orange blossom) and adulterants (sugar, maple syrup, microplastics).

Main Results:

• Metasurfaces exhibited distinct resonance frequency shifts and intensity modulations corresponding to different honey types and adulteration.
• The observed electromagnetic responses were consistent with data from Raman and Fourier-transform infrared (FTIR) spectroscopy.
• The fabricated metasurfaces demonstrated efficiency in detecting honey adulteration and contamination.

Conclusions:

• Millimeter-scale metasurfaces are effective sensors for honey quality control and adulteration detection.
• The distinct electromagnetic signatures allow for differentiation of honey types and identification of contaminants.
• Metasurface-based sensors offer a promising alternative to traditional spectroscopic techniques for honey analysis.