研究目的
Investigating the design and testing of a highly sensitive metasurface device based on free-standing complementary asymmetric split-ring resonators for sensing applications at terahertz frequencies.
研究成果
The free-standing complementary planar metasurface sensor demonstrated high sensitivity for terahertz sensing applications, with a frequency sensitivity of 91.7 GHz/RIU. The absence of a substrate enhances the interaction between the terahertz confined field and the analyte overlayer, offering potential for efficient and cost-effective biosensors.
研究不足
The sensitivity of the sensor is limited by the fabrication precision and the roughness of the sensor's surface, which can affect the transmission amplitude. The use of laser machining, while cost-effective, may introduce limitations in the minimum achievable feature size.
1：Experimental Design and Method Selection
The study involved designing and simulating a free-standing complementary asymmetric split-ring resonator (FCA-SRR) metasurface using commercial software Microwave Studio CST. The structure was fabricated by laser machining through a 12 μm aluminum layer.
2：Sample Selection and Data Sources
The sensor was characterized in transmission using terahertz time-domain spectroscopy. Terahertz pulses were recorded for a time window of 200 ps, allowing a frequency resolution of 5 GHz.
3：List of Experimental Equipment and Materials
Laser machining setup for fabrication, terahertz time-domain spectroscopy system for characterization, and galactose and sucrose analytes for testing.
4：Experimental Procedures and Operational Workflow
The FCA-SRR structure was excited with the E-field pointing in the y-direction to probe the broken symmetry, inducing a Fano resonance. The sensor's performance was evaluated by measuring the frequency shift induced by the deposition of galactose and sucrose analytes.
5：Data Analysis Methods
The frequency shift of the resonant frequency was analyzed to determine the sensor's sensitivity. The Q-factor was evaluated by taking the ratio of the resonance frequency to the full width at half maximum bandwidth.
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