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Borwen You, Ching-Yu Chen, Chin-Ping Yu

|April 26, 2017

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This study introduces a novel terahertz waveguide using a metal rod array for label-free fluid sensing. The device enhances phase sensitivity, enabling sensitive detection of liquid analytes.

Area of Science:

Terahertz (THz) technology
Materials science
Microfluidics

Background:

Terahertz spectroscopy offers unique capabilities for material characterization.
Microfluidic devices are crucial for miniaturized sensing platforms.
Label-free sensing is highly desirable for real-time analysis.

Purpose of the Study:

To develop a miniaturized terahertz waveguide for enhanced fluid sensing.
To investigate the wave guidance mechanism in a metal rod array.
To demonstrate label-free detection and identification of liquid analytes.

Main Methods:

Experimental investigation of terahertz transmission spectra through a metal rod array.
Integration of the metal rod array into a microfluidic system.

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Characterization of terahertz wave interaction with fluid analytes.

Main Results:

Wave guidance attributed to transverse-electric-polarized wave resonance in metal rod slits.
Achieved an order of magnitude enhancement in phase change due to extended optical path length.
Successfully identified acetone, methanol, and ethanol with high sensitivity (detection limit < 0.1 mmol).

Conclusions:

The metal rod array functions as an effective terahertz waveguide in microfluidics.
The enhanced phase sensitivity enables precise label-free detection of liquid analytes.
The developed sensor shows potential for lab-on-chip applications in industrial and medical diagnostics.