Abstract

The authors use a surface-relief fiber Bragg grating with a polydimethylsiloxane (PDMS) layer as a volatile organic compound chemical sensor. A PDMS layer is used because it is compatible with the optical properties of the grating and exhibits good chemical selectivity. As the analyte is absorbed the refractive index of the PDMS changes, causing the Bragg wavelength to shift, and this shift is correlated to chemical type and concentration. The direction and amount of the Bragg wavelength shift is dependent on the absorbed chemical. The authors demonstrate chemical differentiation between dichloromethane and acetone in gaseous states.

© 2007 Optical Society of America

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References

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2006 (1)

2005 (4)

G. B. Tait, G. C. Tepper, D. Pestov, and P. M. Boland, Proc. SPIE 5994, 599407 (2005).
[CrossRef]

X. Chen, K. Zhou, L. Zhang, and I. Bennion, IEEE Photon. Technol. Lett. 17, 864 (2005).
[CrossRef]

W. Liang, Y. Huang, Y. Xu, R. K. Lee, and A. Yariv, Appl. Phys. Lett. 86, 151122 (2005).
[CrossRef]

A. Iadicicco, S. Campopiano, A. Cutolo, M. Giordano, and A. Cusano, IEEE Photon. Technol. Lett. 17, 1250 (2005).
[CrossRef]

2003 (1)

J. N. Lee, C. Park, and G. M. Whitesides, Anal. Chem. 75, 6544 (2003).
[CrossRef] [PubMed]

1999 (1)

R. A Potyrailo and G. M. Hieftje, Fresenius' J. Anal. Chem. 364, 32 (1999).
[CrossRef]

1997 (1)

K. Spaeth, G. Kraus, and G. Gauglitz, Fresenius' J. Anal. Chem. 357, 32 (1997).
[CrossRef]

1993 (1)

1992 (1)

M. A. Jensen and R. H. Selfridge, Appl. Opt. 31, 211 (1992).

Anal. Chem. (1)

J. N. Lee, C. Park, and G. M. Whitesides, Anal. Chem. 75, 6544 (2003).
[CrossRef] [PubMed]

Appl. Opt. (2)

Appl. Phys. Lett. (1)

W. Liang, Y. Huang, Y. Xu, R. K. Lee, and A. Yariv, Appl. Phys. Lett. 86, 151122 (2005).
[CrossRef]

Appl. Spectrosc. (1)

Fresenius' J. Anal. Chem. (2)

R. A Potyrailo and G. M. Hieftje, Fresenius' J. Anal. Chem. 364, 32 (1999).
[CrossRef]

K. Spaeth, G. Kraus, and G. Gauglitz, Fresenius' J. Anal. Chem. 357, 32 (1997).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

X. Chen, K. Zhou, L. Zhang, and I. Bennion, IEEE Photon. Technol. Lett. 17, 864 (2005).
[CrossRef]

A. Iadicicco, S. Campopiano, A. Cutolo, M. Giordano, and A. Cusano, IEEE Photon. Technol. Lett. 17, 1250 (2005).
[CrossRef]

Proc. SPIE (1)

G. B. Tait, G. C. Tepper, D. Pestov, and P. M. Boland, Proc. SPIE 5994, 599407 (2005).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Scanning electron microscope image of grating etched into the flat side of the D-shaped optical fiber. The NA is 0.32, and the cutoff wavelength is 1230 ± 130 nm .

Fig. 2
Fig. 2

Change in Bragg wavelength for both the TE and TM modes as a function of SRI. The shift in Bragg wavelength is also shown for the TM mode for a grating coated with sapphire.

Fig. 3
Fig. 3

(a) Drawing of the side view cross section of the completed VOC sensor coated with sapphire and PDMS. (b) Reflection spectrum from the SR-FBG with the 80 nm of deposited sapphire and 2 μ m of spun-on cured PDMS.

Fig. 4
Fig. 4

Graph of the Bragg wavelength shift as a function of VOC concentration.

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