We describe our recent progress in polymer fibre Bragg grating technology, including the writing of the first FBGs in
TOPAS cyclic olefin copolymer, enhancements to photosensitivity brought about by dopants and studies on grating
annealing.
We report on the temperature response of FBGs recorded in pure PMMA and TOPAS holey fibres. The gratings are fabricated for operational use at near IR wavelengths, using a phase mask and a CW He-Cd laser operating at 325nm. The room temperature grating response is non-linear and characterized by quadratic behaviour for temperatures from room temperature to the glass transition temperature, and this permanent change is affected by the thermal history of the gratings. We also report the first FBG inscription in microstructured polymer optical fibres fabricated from TOPAS. This material is fully polymerized and has very low moisture absorption, leading to very good fibre drawing properties. Furthermore, although TOPAS is chemically inert and bio-molecules do not readily bind to its surface, treatment with Antraquinon and subsequent UV activation allows sensing molecules to be deposited in well defined spatial locations. When combined with grating technology this provides considerable potential for label-free bio-sensing.
We report on the temperature response of FBGs recorded in pure PMMA and TOPAS holey fibers. The gratings are
fabricated for operational use at near IR wavelengths, using a phase mask and a cw He-Cd laser operating at 325nm. The
room temperature grating response is non-linear and characterized by quadratic behavior for temperatures from room
temperature to the glass transition temperature, and this permanent change is affected by the thermal history of the
gratings. We also report the first FBG inscription in microstructured polymer optical fibers fabricated from TOPAS. This
material is fully polymerized and has very low moisture absorption, leading to very good fiber drawing properties.
Furthermore, although TOPAS is chemically inert and bio-molecules do not readily bind to its surface, treatment with
Antraquinon and subsequent UV activation allows sensing molecules to be deposited in well defined spatial locations.
When combined with grating technology this provides considerable potential for label-free bio-sensing.
Raman spectroscopy using a microstructured optical fiber is discussed, with focus on evanescent sensing. It is shown that the optimum fiber has a lattice pitch close to the airhole diameter.
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