A Dual-Band High-Sensitivity THz Metamaterial Sensor Based on Split Metal Stacking Ring.

Area of Science:

• Physics
• Materials Science
• Spectroscopy

Background:

• Terahertz (THz) detection offers rapid, non-destructive analysis but faces sensitivity limitations due to weak sources and analyte signals.
• Metamaterials (MMs) are engineered structures with unique electromagnetic properties, offering a promising route to enhance THz detection capabilities.
• Current THz sensors often lack the sensitivity and multi-feature matching required for complex analyses.

Purpose of the Study:

• To propose and demonstrate a high-sensitivity, dual-band terahertz metamaterial sensor.
• To improve the reliability and sensitivity of THz spectroscopy through multi-point resonance matching.
• To validate the sensor's performance in distinguishing analytes with similar properties.

Main Methods:

• Design and fabrication of a split metal stacking ring resonator (SMSRR) based metamaterial sensor.
• Characterization of the sensor's dual-band resonance properties in the 0.1 to 3 THz range.
• Testing the sensor's sensitivity and performance using analytes with varying refractive indices, such as edible oils.

Main Results:

• The proposed SMSRR sensor exhibits two distinct resonances at 0.97 THz and 2.88 THz.
• Achieved highest sensitivities of 304 GHz/RIU and 912 GHz/RIU at the respective resonant frequencies.
• Successfully distinguished four types of edible oils by leveraging multi-point matching of resonance frequencies and analyte characteristics.

Conclusions:

• The dual-band THz MM sensor demonstrates significant improvements in sensitivity and reliability.
• Multi-point feature matching enhances the accuracy and robustness of THz detection.
• This work provides a foundation for advanced THz sensing with potential applications in various fields.