Abstract

A water core photonic crystal Fresnel fiber exploiting a hole distribution on zone plates of a cylindrical waveguide was developed and characterized. This fiber has similar guiding properties as the pristine air-hole guiding fiber although a large loss edge ~900nm is observed indicating that the bandgap associated with Fresnel guidance has shifted to longer wavelengths. The absorption bands of the water in the region of the NIR were observed. The application to biosensing is discussed.

© 2005 Optical Society of America

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References

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Appl. Opt.

Appl. Phys. Lett.

J. Stone, �??Optical transmission in liquid-core quartz fibers,�?? Appl. Phys. Lett. 20, 239-240 (1972).
[CrossRef]

IEEE J. Quantum Electron

J. Stone, �??Optical transmission loss in liquid-core hollow fibers,�?? IEEE J. Quantum Electron 8, 386-388 (1972).
[CrossRef]

Meas. Sci. Technol.

J.M. Fini, �??Microstructure fibres for optical sensing in gases and liquids,�?? Meas. Sci. Technol. 15, 1120-1128 (2004).
[CrossRef]

Med. & Bio. Engineering & Computing

P.M. Gewehr, D.T. Delpy, �??Optical oxygen sensor based on phosphorescence lifetime quenching and employing a polymer immobilized metalloporphyrin probe .1. Theory and instrumentation,�?? Medical & Biological Engineering & Computing 31, 2-10 (1993).
[CrossRef] [PubMed]

Opt. Commun.

G.R. Kumar, M. Ravikanth, S. Banerje, A. Sevian, �??Third order optical nonlinearity in basket handle porphyrins-picosecond four-wave mixing and excited state dynamics,�?? Opt. Commun. 144, 245-251 (1997).
[CrossRef]

J. Canning, �??Diffraction-free mode generation and propagation in optical waveguides,�?? Opt. Commun. 207, 35-39 (2002).
[CrossRef]

Opt. Express

Opt. Lett.

Other

E. Hecht, Optics, (Addison-Wesley 1998).

A.J. Welch and M.J.C. van Gemert, Optical-Thermal Response of Laser-Irradiated Tissue, (Series: Lasers, Photonics, and Electro-Optics �??Plenum Press 1995).

N. Groothoff, C. Martelli, J. Canning, �??Fresnel Fibre Gratings,�?? In preparation.

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Figures (5)

Fig. 1.
Fig. 1.

SEM image of the cross-section of the Fresnel fiber.

Fig. 2.
Fig. 2.

Fabrication process of the end caps to selectively fill the central hole of the air-core Fresnel fiber. a) Schematic of the fabrication process; b) side image of the end caps showing the length of the end cap; c) cross section image with the focal point in the central hole of the Fresnel fiber showing that central hole is completely open; d) Cross section image of the end face of the water-core Fresnel fiber.

Fig. 3.
Fig. 3.

Experimental setup to characterize the water core Fresnel fiber.

Fig. 4.
Fig. 4.

Modal evolution for 1550nm of the air-core Fresnel fiber (a) and of the water core Fresnel fiber (b) showing the mode in three different axial positions of the near field of the fibers.

Fig. 5.
Fig. 5.

Transmission bands of the air-core Fresnel fiber (a) and the water-core Fresnel fiber (b). The main absorption bands of water are observed.

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