研究目的
Investigating the prospects of integrating terahertz (THz) time-domain spectroscopy (TDS) within polymer-based microfluidic platforms and characterizing the THz absorption coefficients of various polar and nonpolar polymers for their use in such platforms.
研究成果
The study demonstrated that the THz absorption characteristics of polymers significantly affect the performance of microfluidic platforms in THz-TDS analyses. The UHMWPE microfluidic platform, with its low THz absorption, provided reliable measurements up to a higher frequency (1.75 THz) compared to the PET platform (1.38 THz). These findings are crucial for the development of future THz technology and polymer-based microfluidic systems.
研究不足
The study was limited to the characterization of specific polar and nonpolar polymers and their integration into microfluidic platforms for THz-TDS analyses. The performance of the platforms was evaluated with a single test fluid (PDMS-CA), and the findings may not be directly applicable to other fluids or materials without further investigation.
1：Experimental Design and Method Selection
The study involved measuring the THz absorption coefficients of various polar and nonpolar polymers and designing, fabricating, and testing two microfluidic platforms based on PET and UHMWPE to evaluate their performance in THz-TDS analyses.
2：Sample Selection and Data Sources
Samples of polar polymers (PET, PC, PMMA, PDMS) and nonpolar polymers (FEP, PS, HDPE, UHMWPE) were prepared with thicknesses optimized for THz absorption measurements. The microfluidic platforms were fabricated with PET and UHMWPE as representative high-loss and low-loss polymers, respectively.
3：List of Experimental Equipment and Materials
A CO2 laser cutter (H-Series 20 × 12 30 W, Full Spectrum Laser LLC) was used for patterning the microfluidic platforms. The THz-TDS system included an ultrafast pulsed laser (FFS-SYS-2B, TOPTICA Photonics AG), parabolic mirrors, a pellicle beamsplitter, an electro-optic ZnTe crystal, a quarter waveplate, a polarizing beamsplitter, and a differential photodetector.
4：Experimental Procedures and Operational Workflow
The THz absorption coefficients of the polymer samples were measured using a THz-TDS system. The microfluidic platforms were tested with PDMS-CA as a test fluid to evaluate their performance in THz-TDS analyses.
5：Data Analysis Methods
The THz amplitude and phase distributions were used to calculate the frequency-dependent refractive index, transmissivity, reflectivity, and absorption coefficient of the samples. The dynamic range and maximum measurable THz absorption coefficient were also determined.
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