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Polymer Waveguide Sensor Based on Evanescent Bragg Grating for Lab-on-a-Chip Applications.

Zhenyu Zhang1,2, Ahmad Abdalwareth1,2, Günter Flachenecker1

  • 1Department for Fiber Optical Sensor Systems, Fraunhofer Heinrich Hertz Institute, 38640 Goslar, Germany.

Sensors (Basel, Switzerland)
|February 24, 2024
PubMed
Summary
This summary is machine-generated.

This study presents an integrated Bragg grating waveguide sensor for chemical detection. The sensor demonstrates high sensitivity for refractive index and hydrogen gas concentration, showcasing its lab-on-a-chip potential.

Keywords:
Bragg gratingevanescent field sensorhydrogen sensorlab-on-a-chipnanoparticleson-chip optical sensoroptical sensorpolymer waveguide

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Area of Science:

  • Photonics
  • Chemical Sensing
  • Materials Science

Background:

  • Evanescent field-based sensors offer high sensitivity for chemical detection.
  • Integrated waveguide sensors are crucial for lab-on-a-chip applications.
  • Bragg gratings are versatile optical sensing elements.

Purpose of the Study:

  • To develop and characterize an evanescent Bragg grating sensor integrated into microchannels.
  • To demonstrate its application in refractive index sensing and gas-phase hydrogen detection.
  • To evaluate its potential for lab-on-a-chip systems.

Main Methods:

  • Fabrication of a few-mode planar polymer waveguide with an integrated Bragg grating.
  • Postprocessing using point-by-point direct inscription.
  • Characterization via monitoring Bragg signal wavelength shift.
  • Functionalization with palladium nanoparticles for hydrogen sensing.

Main Results:

  • The sensor exhibited a temperature sensitivity of -47.75 pm/K.
  • Achieved a refractive index sensitivity of 6.5 nm/RIU.
  • Demonstrated reproducible hydrogen gas detection up to 4 vol% with a palladium nanoparticle coating.

Conclusions:

  • The integrated Bragg-grating-based waveguide sensor is a promising platform for lab-on-a-chip chemical analysis.
  • The evanescent field-based approach enables sensitive detection of liquids and gases.
  • The sensor's modular design allows for functionalization for specific analytes.