Abstract

We report an original design approach based on the modal dispersion curves for the development of long period gratings in transition mode near the dispersion turning point exhibiting ultrahigh refractive index sensitivity. The theoretical model predicting a giant sensitivity of 9900 nm per refractive index unit in a watery environment was experimentally validated with a result of approximately 9100 nm per refractive index unit around an ambient index of 1.3469. This result places thin film coated LPGs as an alternative to other fiber-based technologies for high-performance chemical and biological sensing applications.

© 2012 Optical Society of America

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2011 (2)

2010 (1)

2009 (2)

D. K. C. Wu, B. T. Kuhlmey, and B. J. Eggleton, Opt. Lett. 34, 322 (2009).
[CrossRef]

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

2008 (2)

2006 (1)

A. Cusano, A. Iadicicco, P. Pilla, A. Cutolo, M. Giordano, and S. Campopiano, Appl. Phys. Lett. 89, 201116 (2006).
[CrossRef]

2005 (2)

Ambrosio, L.

Arregui, F.

Baldini, F.

C. Trono, F. Baldini, M. Brenci, F. Chiavaioli, and M. Mugnaini, Meas. Sci. Technol. 22, 075204 (2011).
[CrossRef]

Borriello, A.

Brenci, M.

C. Trono, F. Baldini, M. Brenci, F. Chiavaioli, and M. Mugnaini, Meas. Sci. Technol. 22, 075204 (2011).
[CrossRef]

Buosciolo, A.

Campopiano, S.

A. Cusano, A. Iadicicco, P. Pilla, A. Cutolo, M. Giordano, and S. Campopiano, Appl. Phys. Lett. 89, 201116 (2006).
[CrossRef]

A. Cusano, A. Iadicicco, P. Pilla, L. Contessa, S. Campopiano, A. Cutolo, and M. Giordano, Opt. Lett. 30, 2536 (2005).
[CrossRef]

Cheung, C. S.

Chiavaioli, F.

C. Trono, F. Baldini, M. Brenci, F. Chiavaioli, and M. Mugnaini, Meas. Sci. Technol. 22, 075204 (2011).
[CrossRef]

Contessa, L.

Cusano, A.

Cutolo, A.

Del Villar, I.

Eggleton, B. J.

Fan, X.

Ghalmi, S.

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

Giordano, M.

Heflin, J. R.

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

Iadicicco, A.

A. Cusano, A. Iadicicco, P. Pilla, A. Cutolo, M. Giordano, and S. Campopiano, Appl. Phys. Lett. 89, 201116 (2006).
[CrossRef]

A. Cusano, A. Iadicicco, P. Pilla, L. Contessa, S. Campopiano, A. Cutolo, and M. Giordano, Opt. Lett. 30, 2536 (2005).
[CrossRef]

James, S. W.

Kuhlmey, B. T.

Lalanne, P.

Lee, C. L.

Lin, C. J.

Lin, Y.

Malachovská, V.

Matías, I.

Mugnaini, M.

C. Trono, F. Baldini, M. Brenci, F. Chiavaioli, and M. Mugnaini, Meas. Sci. Technol. 22, 075204 (2011).
[CrossRef]

Pilla, P.

Ramachandran, S.

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

Stolen, R. H.

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

Tatam, R. P.

Topliss, S. M.

Trono, C.

C. Trono, F. Baldini, M. Brenci, F. Chiavaioli, and M. Mugnaini, Meas. Sci. Technol. 22, 075204 (2011).
[CrossRef]

Van Cott, K.

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

Wang, Z.

Z. Wang, J. R. Heflin, K. Van Cott, R. H. Stolen, S. Ramachandran, and S. Ghalmi, Sensors Actuators B 139, 618 (2009).
[CrossRef]

Weng, Z. Y.

White, I. M.

Wu, D. K. C.

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Figures (4)

Fig. 1.
Fig. 1.

MDP for a bare LPG in a Fibercore PS1250/1500 and with SRI = 1 (bold lines); modal transition for the LP 011 as the overlayer thickness is increased and with SRI = 1.33 (dashed lines).

Fig. 2.
Fig. 2.

Grating period versus overlayer thickness to obtain coupling of cladding modes ( LP 09 LP 011 ) at a wavelength of 1.55 μm. Sensitivity to SRI changes were evaluated at each working point and detailed in the color bar.

Fig. 3.
Fig. 3.

Spectral features of the bare LPG ( Λ = 200 μm ) and of the same grating after the PS overlayer deposition with estimated thickness of 245 nm; the spectra are compared with the numerical model.

Fig. 4.
Fig. 4.

Experimental SRI characterization of the coated LPG. Inset, spectral position of the attenuation band against the SRI changes along with a fitting of the data.

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