Related Experiment Video
Updated: Apr 18, 2026
09:03
A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
7.8K
Optical Gratings Coated with Thin Si3N4 Layer for Efficient Immunosensing by Optical Waveguide Lightmode Spectroscopy
Lorena Diéguez1, David Caballero2, Josep Calderer3
1Department of Electronics, University of Barcelona, C/Martí i Franquès 1, Barcelona, ES 08028, Spain. lorena.dieguez@unisa.edu.au.
Biosensors
|January 15, 2015
Summary
New silicon nitride coatings on optical gratings show promise for real-time biosensing. This advancement in optical waveguide technology paves the way for integrating biosensors with microelectronics.
Area of Science:
- Materials Science
- Biotechnology
- Optoelectronics
Background:
- Optical gratings are crucial components in various sensing applications.
- Silicon nitride (Si3N4) is a material with potential for biosensor development.
- Real-time monitoring of biological interactions is essential for diagnostics.
Purpose of the Study:
- To develop and evaluate silicon nitride coated optical gratings for biosensing.
- To demonstrate the feasibility of using these gratings with Optical Waveguide Lightmode Spectroscopy (OWLS).
- To explore the integration of optical waveguides with microelectronics for advanced biosensors.
Main Methods:
- Deposition of a 10 nm transparent silicon nitride layer on commercial optical gratings via sputtering.
- Characterization of the silicon nitride layer using X-ray photoelectron spectroscopy and atomic force microscopy.
- Testing the sensor performance using Optical Waveguide Lightmode Spectroscopy (OWLS).
Main Results:
- The quality of the sputtered silicon nitride layer was confirmed.
- The silicon nitride coated gratings successfully functioned as sensors.
- OWLS demonstrated real-time detection of an antibody-protein pair based on concentration.
Conclusions:
- Silicon nitride is a viable functional layer for optical biosensors.
- The developed Si3N4 coated gratings enable real-time detection of biomolecular interactions.
- This technology offers new possibilities for integrating optical waveguides with microelectronics in biosensing platforms.
