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3D-printed doped optical waveguides for sensing applications: graphite- and zinc-doped structures
Applied Optics
|March 17, 2026
Summary
Researchers developed 3D-printed optical waveguides using graphite and zinc oxide (ZnO) for sensing applications. These low-cost waveguides show promise for detecting alcohol and DNA, offering tunable performance through dopant selection.
Area of Science:
- Materials Science
- Optics
- Chemical Sensing
Background:
- Optical waveguides are crucial for light manipulation in various applications.
- Developing cost-effective and customizable waveguides for specific sensing tasks remains a challenge.
Purpose of the Study:
- To design, fabricate, and optically characterize stereolithography-printed waveguides doped with graphite and zinc oxide (ZnO).
- To evaluate the performance of these waveguides as optofluidic sensors for chemical and biological analytes.
Main Methods:
- Stereolithography 3D printing for waveguide fabrication.
- Bruggeman effective medium approximation for refractive index prediction.
- Experimental validation of optical properties and sensing capabilities.
- Raman spectroscopy for molecular discrimination.
Main Results:
- Successfully fabricated and characterized doped optical waveguides exhibiting total internal reflection.
- Demonstrated the waveguides' ability to detect variations in alcoholic beverages and telomeric DNA concentrations.
- Confirmed molecular discrimination between samples using Raman spectroscopy.
Conclusions:
- Stereolithography offers a reproducible method for producing low-cost, application-specific optical waveguides.
- Dopant selection (graphite and ZnO) allows for tunable waveguide performance.
- These waveguides are suitable for developing advanced chemical and biological sensing platforms.
