Related Experiment Video
Updated: Jun 28, 2026
07:28
Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
Integrated optical sensor using a liquid-core waveguide in a Mach-Zehnder interferometer
Patrick Dumais1, Claire L Callender, Julian P Noad
1Communications Research Centre Canada, Station H, Ottawa, Ontario, Canada.
Optics Express
|October 30, 2008
Summary
This study presents a novel optical sensor using a liquid-core waveguide in a Mach-Zehnder interferometer. It achieves high-resolution refractometry by utilizing the thermo-optic effect of liquids.
Area of Science:
- Photonics and optical sensing
- Microfluidics and integrated optics
Background:
- Mach-Zehnder interferometers are sensitive optical devices.
- Liquid-core waveguides offer unique optical properties for sensing applications.
Purpose of the Study:
- To demonstrate an optical sensor based on a monolithically integrated Mach-Zehnder interferometer with a liquid-core waveguide.
- To achieve high-resolution refractometry using the thermo-optic effect.
Main Methods:
- Fabrication of a silica-on-silicon device with self-forming microchannels.
- Integration of a liquid-core waveguide into one arm of the interferometer.
- Utilizing the thermo-optic effect to modulate the refractive index of the liquid core.
Main Results:
- Demonstration of refractometry with a resolution better than 4x10⁻⁶.
- Analysis of the polarization dependence of the sensor's response.
- Successful integration of microfluidic and photonic components.
Conclusions:
- The developed optical sensor offers high-resolution refractometry capabilities.
- The fabrication technique is compatible with standard microfabrication processes.
- The device shows potential for various sensing applications requiring precise refractive index measurements.
