研究目的
To present a highly confined spoof surface plasmon (SSP) based sensor for testing dielectric materials in microwave and terahertz (THz) frequency regions, facilitating ease of integration with modern RF and THz frequency systems and enabling the testing of small volume liquid specimens.
研究成果
The proposed spoof surface plasmon based planar CPW line dielectric sensor demonstrates high confinement of E-field at electrically small regions, enabling the sensing of liquid samples with very low volume. It exhibits a relatively higher quality factor compared to existing planar sensors, making it suitable for distinguishing samples with nearly similar dielectric loss characteristics. The sensor's design allows for easy integration with modern microwave and THz systems, presenting a potential candidate for chemical and biomedical sensing applications.
研究不足
The experimental validation and measurements are primarily carried out at microwave frequency regime due to the unavailability of THz measurement setup. The sensor's performance at THz frequencies is numerically analyzed but not experimentally validated.
1：Experimental Design and Method Selection:
The sensor design involves a main coplanar waveguide (CPW) line and a defected T-shaped SSP line at the top and bottom of the substrate, respectively. The defect in the SSP line provides a stop band, localizing transmission energy at the defect location. The resonance frequency and energy localization are tuned by varying the defect height and SSP strip periodicity.
2：Sample Selection and Data Sources:
Standard solid and liquid samples are used for testing the sensor in the microwave frequency region.
3：List of Experimental Equipment and Materials:
The sensor is fabricated on a 0.635 mm thick Roger RT duroid 6010LM substrate with a 0.035 mm thick copper layer. The full wave electromagnetic solver (CST-MWS) is used for numerical optimization and testing.
4：635 mm thick Roger RT duroid 6010LM substrate with a 035 mm thick copper layer. The full wave electromagnetic solver (CST-MWS) is used for numerical optimization and testing.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The sensor prototype is fabricated and tested using a vector network analyzer (VNA) for experimental validation at microwave frequencies.
5：Data Analysis Methods:
The transmission response of the sensor is analyzed to distinguish test samples with closely spaced dielectric constants, leveraging the sensor's high quality factor and sensitivity.
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