研究目的
To design a terahertz microfluidic sensor based on metasurface for analysis of extremely small volume of sample with ultrahigh sensitivity.
研究成果
A terahertz microfluidic sensor based on metasurface was designed, and a measuring system for it was constructed. The sensor can be used in analysis for extremely small volume of sample with ultrahigh sensitivity. Asymmetry metasurface were discussed with the considering of figure of merit. A new tradeoff index FD was defined to assess the performance of microfluidic sensor and the best metasurface for our microfluidic sensor was selected through FD.
研究不足
The sensing sensitivities were limited by structure of metasurface or excitation. The experiment reproducibility of dehydrated samples would not be satisfied and the effect of aqueous environment should not be ignored.
1：Experimental Design and Method Selection:
Numerical simulations were conducted to determine the structure and excitation mode for metasurface. A method to obtain the concentration of sample solution was given as an application of the sensor.
2：Sample Selection and Data Sources:
Solution samples with varying permittivity were used to simulate the change of concentration.
3：List of Experimental Equipment and Materials:
A THz measuring system similar to the conventional terahertz time domain spectroscopy was utilized, pumped by a femtosecond laser.
4：Experimental Procedures and Operational Workflow:
Pump lasers were guided to focus on the GaAs substrate, while probe lasers were sent through a mechanical delay line for detecting.
5：Data Analysis Methods:
Transmission spectrum was detected by an optical probe, and transmittivity was analyzed through the data of S21.
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