Abstract

We present highly sensitive refractometers based on a long-period grating in a large-mode-area photonic crystal fiber (PCF). The maximum sensitivity is 1500nmrefractive index unit at a refractive index of 1.33, to our knowledge the highest reported for any fiber grating. The minimal detectable index change is 2×105. The high sensitivity is obtained by infiltrating the sample into the holes of the PCF to give a strong interaction between the sample and the probing field.

© 2008 Optical Society of America

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References

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2008 (1)

2007 (1)

2006 (1)

L. Rindorf, J. B. Jensen, M. Dufva, L. H. Pedersen, P. E. Hoiby, and O. Bang, Opt. Express 14, 8824 (2006).
[CrossRef]

2004 (2)

J. H. Chong, P. Shum, H. Haryono, A. Yohana, M. K. Rao, C. Lu, and Y. Zhu, Opt. Commun. 229, 65 (2004).
[CrossRef]

J. M. Fini, Meas. Sci. Technol. 15, 1120 (2004).
[CrossRef]

2003 (1)

2002 (2)

2000 (1)

H. El-Kashef, Physica B 279, 295 (2000).
[CrossRef]

1999 (1)

1996 (1)

1973 (1)

A. Yariv, IEEE J. Quantum Electron. QE-9, 919 (1973).
[CrossRef]

IEEE J. Quantum Electron. (1)

A. Yariv, IEEE J. Quantum Electron. QE-9, 919 (1973).
[CrossRef]

J. Lightwave Technol. (1)

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

Meas. Sci. Technol. (1)

J. M. Fini, Meas. Sci. Technol. 15, 1120 (2004).
[CrossRef]

Opt. Commun. (1)

J. H. Chong, P. Shum, H. Haryono, A. Yohana, M. K. Rao, C. Lu, and Y. Zhu, Opt. Commun. 229, 65 (2004).
[CrossRef]

Opt. Express (1)

L. Rindorf, J. B. Jensen, M. Dufva, L. H. Pedersen, P. E. Hoiby, and O. Bang, Opt. Express 14, 8824 (2006).
[CrossRef]

Opt. Lett. (5)

Physica B (1)

H. El-Kashef, Physica B 279, 295 (2000).
[CrossRef]

Other (2)

Cosmol Multiphysics, http://www.comsol.com.

Crystal Fibre A/S, http://www.crystal-fibre.com.

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Figures (4)

Fig. 1
Fig. 1

Scanning-electron-microscope pictures of the LMA10 PCF [7] used. The parameters are d Λ = 0.478 , Λ = 7.12 μ m .

Fig. 2
Fig. 2

Spectra of the PCF-LPG filled with air and methanol. Each pair is offset by 5 dBm for clarity. Inset, the refractive index of silica glass, water, and methanol.

Fig. 3
Fig. 3

Shifts for different resonance wavelengths for methanol-filled LPGs. Inset, the refractive index coefficient for the different resonant wavelengths.

Fig. 4
Fig. 4

Group-index mismatch calculated from the resonance wavelengths and grating periods for air- and methanol-filled PCF-LPG. The field fraction as a function of wavelength for the core and cladding mode is shown.

Tables (1)

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Table 1 Resonant Wavelengths for Methanol-Filled PCF-LPGs and the Corresponding Material Parameters n r and ( d λ r ) ( d n r ) for Methanol at the Resonance Wavelength a

Equations (1)

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d λ r d n r d ( n co n cl ) d n r 2 n co n r ( f u , co f u , cl ) ,

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