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Hydrogen sensor based on metallic photonic crystal slabs.

D Nau1, A Seidel, R B Orzekowsky

  • 1Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany.

Optics Letters
|September 18, 2010
PubMed
Summary

This study introduces a novel hydrogen sensor using metallic photonic crystals. The device shows a measurable change in light transmission with varying hydrogen gas concentrations.

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Area of Science:

  • Nanophotonics
  • Gasochromic sensors
  • Optical materials

Background:

  • Metallic photonic crystal slabs offer unique optical properties.
  • Tungsten trioxide (WO(3)) is a known gasochromic material.
  • Nanowire arrays can enhance light-matter interactions.

Purpose of the Study:

  • To develop and characterize a hydrogen sensor based on metallic photonic crystal slabs.
  • To investigate the gasochromic effect of WO(3) in a photonic crystal structure.
  • To analyze the spectral response to hydrogen exposure.

Main Methods:

  • Fabrication of a photonic crystal slab with a WO(3) waveguide and gold nanowires.
  • Exposure of the sensor to varying concentrations of hydrogen gas.
  • Optical transmission measurements to observe spectral changes.

Main Results:

  • The photonic crystal exhibited sharp spectral resonances sensitive to hydrogen.
  • Hydrogen exposure caused a measurable change in optical transmission.
  • The gasochromic mechanism was confirmed within the photonic crystal structure.

Conclusions:

  • The metallic photonic crystal slab functions as an effective hydrogen sensor.
  • The sensor's performance is linked to the gasochromic properties of WO(3).
  • Further theoretical analysis can optimize detection limits and sensitivity.