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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)
http://dx.doi.org/10.1364/OE.22.018556


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Abstract

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:
Sensors

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

Citation
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)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-15-18556


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