Abstract

In this paper, a femtosecond laser fabricated fiber inline micro Mach-Zehnder interferometer with deposited palladium film for hydrogen sensing is presented. Simulation results show that the transmission spectrum of the interferometer is critically dependent on the microcavity length and the refractive index of Pd film and a short microcavity length corresponds to a high sensitivity. The experimental results obtained in the wavelength region of 1200–1400 nm, and in the hydrogen concentration range of 0–16%, agree well with that of the simulations. The developed system has high potential in hydrogen sensing with high sensitivity.

© 2012 Optical Society of America

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[CrossRef]

IEEE Photon. Technol. Lett. (2)

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[CrossRef]

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J. Opt. Soc. Am. B (1)

Meas. Sci. Technol. (1)

S. W. James and R. P. Tatam, Meas. Sci. Technol. 14, R49 (2003).
[CrossRef]

Opt. Express (3)

Opt. Fiber Technol. (1)

Y. J. Rao, Opt. Fiber Technol. 12, 227 (2006).
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Opt. Lasers Eng. (1)

K. Schroeder, W. Ecke, and R. Willsch, Opt. Lasers Eng. 47, 1018 (2009).
[CrossRef]

Opt. Lett. (6)

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Figures (4)

Fig. 1.
Fig. 1.

Schematic structure and digital microscope images of MMZI fabricated by fs laser ablation with a 50 μm scale bar. (a) Structural illustration; (b) top view; (c) side view.

Fig. 2.
Fig. 2.

(a) ransmission spectra of MMZI with different microcavity lengths; (b) transmission spectra of MMZI coated with Pd of film between 3 and 2.7, L=40μm, dfilm=110nm; (c) wavelength versus the refractive index of the coated Pd film.

Fig. 3.
Fig. 3.

Normalized transmission spectra of MMZI coated with Pd film of 110 nm in thickness (a)–(b) L=40μm; (c)–(d) L=100μm.

Fig. 4.
Fig. 4.

Wavelength versus hydrogen concentration in different micro-cavity lengths of L=40μm and L=100μm.

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

I=I1+I2+2I1I2cosφ,
φ=2πΔneffL/λ+φ0,
ΔneffL=2(nfilmncore)dfilm+(ncavityncore)(L2dfilm),

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