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Updated: Oct 24, 2025

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

High precision dual-modulation differential terahertz ATR sensor for liquid measurements.

Xiujun Zheng, Thomas Gevart, Guilhem Gallot

|August 13, 2021

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A new quantum-cascade-laser terahertz sensor achieves high sensitivity and stability for detecting low-concentration solutions. This breakthrough advances terahertz sensing for analyzing liquid and biological samples with remarkable precision.

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Last Updated: Oct 24, 2025

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Published on: August 30, 2012

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Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Area of Science:

Terahertz spectroscopy
Quantum cascade laser applications
Chemical sensing

Background:

Terahertz (THz) radiation offers unique properties for non-invasive analysis.
Current THz sensors face challenges in sensitivity and stability for dilute solutions.
Attenuated Total Reflection (ATR) geometry is effective for liquid sample analysis.

Purpose of the Study:

To develop a highly sensitive and stable terahertz sensor for detecting very low concentration solutions.
To leverage quantum-cascade-laser (QCL) technology and ATR geometry for enhanced sensing.
To demonstrate the sensor's capability for analyzing diverse chemical and biological samples.

Main Methods:

Utilized a quantum-cascade-laser (QCL) as the terahertz source.
Employed an attenuated total reflection (ATR) geometry for sample interaction.
Implemented a dual-modulation differential approach to enhance signal-to-noise ratio and stability.

Main Results:

Achieved high sensitivity for detecting solutions at concentrations as low as 1 µM.
Demonstrated excellent long-term stability of 40 dB, crucial for reliable measurements.
Validated sensor performance using standard solutions of ions, sugars, and proteins.

Conclusions:

The developed QCL-based ATR terahertz sensor provides a robust platform for sensitive analysis of dilute solutions.
This technology significantly expands the potential of terahertz spectroscopy for liquid and biological sample characterization.
The sensor's high dynamic range and stability pave the way for advanced applications in chemical and biochemical sensing.