25 October 2011 Low-cost and biocompatible long-period fiber gratings
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In this paper, a low-cost long-period fiber grating (LPFG) induced by a polymeric microstructure is demonstrated. LPFGs are induced on a tapered optical fiber (TOF) when a periodic micro-grating comes into contact with the thin region of the fiber. The micro-grating device is made using polydimethylsiloxane (PDMS), an inexpensive, nontoxic and optically transparent polymer that is extensively used in microfluidics, organic electronics and biotechnological applications. Soft lithography, along with molds built from thermoplastic polystyrene sheets, makes the fabrication straightforward and extremely low-cost. Additionally, no precision machining is necessary and the resolution of the microstructures is limited only by the resolution of the laser printer used for patterning the polystyrene sheets. The TOF and the micro-grating were dimensionally characterized using optical microscopy and white light interferometry, respectively. Variations on the optical spectrum due to pressure and temperature were observed and their magnitudes were similar to those obtained using metallic microstructures. Thus, LPFGs can be made in an inexpensive and expeditious way using PDMS and TOFs. These polymeric devices can be integrated into microfluidic and other labon- a-chip systems where biocompatibility is a valuable characteristic.
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Jorge A. Soto-Olmos, Jorge A. Soto-Olmos, Laura Oropeza-Ramos, Laura Oropeza-Ramos, Juan Hernández-Cordero, Juan Hernández-Cordero, } "Low-cost and biocompatible long-period fiber gratings", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80114S (25 October 2011); doi: 10.1117/12.902143; https://doi.org/10.1117/12.902143

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