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Updated: Feb 2, 2026
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
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Characterization and Integration of Terahertz Technology within Microfluidic Platforms.
Salman Alfihed1,2, Mark H Bergen3, Antonia Ciocoiu4
1School of Engineering, University of British Columbia (UBC), Kelowna, BC V1V 1V7, Canada. salfihed@alumni.ubc.ca.
Micromachines
|November 15, 2018
Summary
This study explores integrating terahertz (THz) time-domain spectroscopy (TDS) with polymer microfluidics. Ultra-high-molecular-weight polyethylene (UHMWPE) platforms enable reliable THz measurements to higher frequencies than polyethylene terephthalate (PET) platforms.
Area of Science:
- Optoelectronics
- Materials Science
- Chemical Engineering
Background:
- Terahertz (THz) time-domain spectroscopy (TDS) offers unique capabilities for material characterization.
- Polymer-based microfluidic platforms are increasingly utilized for lab-on-a-chip applications.
- Integrating THz-TDS with microfluidics requires careful consideration of polymer properties and THz wave interaction.
Purpose of the Study:
- To investigate the feasibility of integrating THz-TDS with various polymer microfluidic platforms.
- To evaluate the performance of microfluidic platforms made from both polar and nonpolar polymers for THz-TDS applications.
- To determine the optimal polymer materials for advanced THz-TDS microfluidic systems.
Main Methods:
- Measurement of THz absorption coefficients for several polar (PET, PC, PMMA, PDMS) and nonpolar (FEP, PS, HDPE, UHMWPE) polymers.
- Design, fabrication, and testing of two microfluidic platforms: one from PET (high-loss polar) and one from UHMWPE (low-loss nonpolar).
- Comparative analysis of THz-TDS measurement capabilities and frequency limitations of the fabricated platforms.
Main Results:
- UHMWPE microfluidic platforms demonstrated reliable THz absorption coefficient measurements up to 1.75 THz.
- PET microfluidic platforms showed reliable measurements only up to 1.38 THz.
- Performance differences were attributed to varying THz absorption levels and dielectric properties (loss tangent) of the polymers.
Conclusions:
- Low-loss nonpolar polymers like UHMWPE are superior for THz-TDS microfluidic applications compared to high-loss polar polymers like PET.
- Material selection is critical for extending the operational frequency range of THz-TDS microfluidic systems.
- Findings support the future integration of THz technology with advanced polymer microfluidic devices for enhanced sensing and analysis.
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