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Design Principles for Sensitivity Optimization in Plasmonic Hydrogen Sensors.

Florian Sterl1, Nikolai Strohfeldt1, Steffen Both1

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

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|January 31, 2020
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Summary
This summary is machine-generated.

This study presents a novel optical sensor for hydrogen gas detection using palladium nanoantennas. The optimized sensor design achieves robust detection of hydrogen down to 100 parts per million (ppm).

Keywords:
Fourier-plane spectroscopyhydrogen detectionmetasurfacemicrospectroscopypalladiumperfect absorberplasmonic sensingtailored disorder

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Area of Science:

  • Nanotechnology
  • Optical Sensing
  • Materials Science

Background:

  • Palladium nanoparticles exhibit optical property changes with hydrogen concentration, making them suitable for gas detection.
  • Existing hydrogen detectors require improved sensitivity, cost-effectiveness, and simple readout mechanisms.
  • Plasmonic 'perfect absorber' structures offer a promising avenue for sensitive optical hydrogen sensing.

Purpose of the Study:

  • To systematically investigate the geometry of cavity-coupled palladium nanostructures for hydrogen sensing.
  • To optimize the optical system concept for enhanced hydrogen detection sensitivity.
  • To establish design rules for maximizing the performance of palladium-based hydrogen sensors.

Main Methods:

  • Fabrication and characterization of palladium nanoantenna arrays on metallic mirrors.
  • Spectroscopic and photometric analysis of optical response to varying hydrogen concentrations.
  • Systematic investigation of nanostructure geometry and optical system parameters.

Main Results:

  • Demonstrated robust detection of hydrogen down to 100 ppm.
  • Established design principles for optimizing hydrogen sensitivity in plasmonic sensors.
  • Showcased a shift in plasmon resonance and far-field reflectance spectrum upon hydrogen absorption.

Conclusions:

  • Optimized palladium nanostructures and optical systems enable highly sensitive hydrogen gas detection.
  • The developed design rules are applicable to a wide range of plasmonic sensors beyond hydrogen.
  • This work contributes to the development of reliable, low-cost, and widely applicable hydrogen detectors.