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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
Fabrication and testing of planar chalcogenide waveguide integrated microfluidic sensor.
Optics Express
|June 18, 2009
Summary
This study presents the first microfluidic device with integrated chalcogenide glass waveguides on silicon for chemical sensing. It detects N-methylaniline with high sensitivity, offering a promising platform for various applications.
Area of Science:
- Materials Science
- Optical Engineering
- Chemical Sensing
Background:
- Microfluidic devices are crucial for lab-on-a-chip applications.
- Chalcogenide glass waveguides offer unique optical properties.
- Integration of optical components with microfluidics is challenging.
Purpose of the Study:
- To develop and demonstrate the first microfluidic device monolithically integrated with planar chalcogenide glass waveguides on a silicon substrate.
- To utilize the device for sensitive chemical detection of N-methylaniline.
- To evaluate the sensor's performance and potential for practical applications.
Main Methods:
- Fabrication of Ge23Sb7S70 glass films via thermal evaporation on silicon.
- Definition of high-index-contrast channel waveguides using SF6 plasma etching.
- Microfluidic channel patterning in SU8 and sealing with polydimethylsiloxane (PDMS).
Main Results:
- Achieved low transmission loss of 2.3 dB/cm at 1550 nm for chalcogenide waveguides.
- Successfully detected N-methylaniline using its N-H bond absorption fingerprint near 1496 nm.
- Demonstrated linear sensor response and expected sensitivity down to 0.7 vol. % N-methylaniline concentration.
Conclusions:
- The integrated device represents a novel platform for chemical sensing.
- The low-cost fabrication and robust design make it suitable for practical applications.
- This technology holds promise for advancing microfluidic-based chemical analysis.
