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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 15 — Jul. 28, 2014
  • pp: 18556–18563

A hydrogen curing effect on surface plasmon resonance fiber optic hydrogen sensors using an annealed Au/Ta2O5/Pd multi-layers film

Ai Hosoki, Michiko Nishiyama, Hirotaka Igawa, Atsushi Seki, and Kazuhiro Watanabe  »View Author Affiliations

Optics Express, Vol. 22, Issue 15, pp. 18556-18563 (2014)

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In this paper, a response time of the surface plasmon resonance fiber optic hydrogen sensor has successfully improved with keeping sensor sensitivity high by means of hydrogen curing (immersing) process of annealed Au / Ta2O5 / Pd multi-layers film. The hydrogen curing effect on the response time and sensitivity has been experimentally revealed by changing the annealing temperatures of 400, 600, 800°C and through observing the optical loss change in the H2 curing process. When the 25-nm Au / 60-nm Ta2O5 / 10-nm Pd multi-layers film annealed at 600°C is cured with 4% H2 / N2 mixture, it is found that a lot of nano-sized cracks were produced on the Pd surface. After H2 curing process, the response time is improved to be 8 s, which is two times faster than previous reported one in the case of the 25-nm Au / 60-nm Ta2O5 / 3-nm Pd multi-layers film with keeping the sensor sensitivity of 0.27 dB for 4% hydrogen adding. Discussions most likely responsible for this effect are given by introducing the α-β transition Pd structure in the H2 curing process.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(310.6845) Thin films : Thin film devices and applications
(240.6380) Optics at surfaces : Spectroscopy, modulation

ToC Category:

Original Manuscript: April 25, 2014
Revised Manuscript: June 3, 2014
Manuscript Accepted: June 20, 2014
Published: July 24, 2014

Ai Hosoki, Michiko Nishiyama, Hirotaka Igawa, Atsushi Seki, and Kazuhiro Watanabe, "A hydrogen curing effect on surface plasmon resonance fiber optic hydrogen sensors using an annealed Au/Ta2O5/Pd multi-layers film," Opt. Express 22, 18556-18563 (2014)

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