研究目的
To propose a terahertz refractive index sensor integrated with a microfluidic channel for high-performance sensing of various materials, including highly absorptive materials.
研究成果
The proposed terahertz refractive index sensor integrated with a microfluidic channel demonstrates high Q-factor and figure of merit, enabling high-performance sensing of various materials, including highly absorptive materials. The sensor's design can be extended to work in other frequency regions, offering potential applications in gases, liquids, and biological materials sensing.
研究不足
The study is based on numerical simulations, and the practical fabrication and experimental validation of the proposed sensor are not discussed. The influence of fabrication imperfections on the sensor's performance is not considered.
1：Experimental Design and Method Selection:
The study involves the design of a toroidal dipole resonance metasurface integrated with a microfluidic channel for terahertz refractive index sensing. The methodology includes numerical simulations to investigate the excitation of toroidal dipole resonance and localized electromagnetic field enhancement.
2：Sample Selection and Data Sources:
The study uses numerical simulations to analyze the sensor's performance with different refractive indices of analytes, including non-polar and polar liquids.
3：List of Experimental Equipment and Materials:
The proposed structure is constructed by 200 nm-thick metal aluminum (Al) with conductivity σdc = 3.56 × 107 S m?1. The microfluidic channel is formed by reactive ion etching, and the unit cell structure on quartz is fabricated by photolithography and liftoff.
4：56 × 107 S m?The microfluidic channel is formed by reactive ion etching, and the unit cell structure on quartz is fabricated by photolithography and liftoff.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The interaction between toroidal dipole resonance and analyte in microfluidic channel is studied using electromagnetic simulation software CST Microwave Studio, where THz waves are normal incidence with electric field along x-direction.
5：Data Analysis Methods:
The study calculates the quality factor and figure of merit from the transmission spectra to evaluate the sensor's performance.
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