Hydrogen detection using polarization diversity via a subwavelength fiber aperture

Steven J. McKeown, Lynford L. Goddard

Research output: Contribution to journalArticle

Abstract

A photonic hydrogen gas sensor is fabricated by etching a subwavelength aperture into an optically thick palladium film deposited on the facet of an optical fiber. Upon adsorption of hydrogen onto the palladium surface, the complex refractive index of the film will change, altering the transmission through the aperture. Due to the plasmonic resonances and enhanced transmission of the C aperture, its response to hydrogen is several times larger than that of a plain film or a nonresonant aperture. Furthermore, the asymmetry of the aperture produces a different hydrogen response for the two polarizations. This leads to different sensitivities to hydrogen. By measuring the polarization-dependent loss (PDL), we can accurately quantify the hydrogen concentration since common-mode noise is eliminated.

Original languageEnglish (US)
Article number6280585
Pages (from-to)1752-1761
Number of pages10
JournalIEEE Photonics Journal
Volume4
Issue number5
DOIs
StatePublished - Sep 19 2012

Keywords

  • Gas detectors
  • nanophotonics
  • optical fiber sensors

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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