12 September 2005 Sensitivity of long period fiber gratings to nanoscale ionic self-assembled multilayers
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Abstract
We have shown that ionic self-assembled multilayers (ISAMs) deposited on optical fiber long period gratings (LPGs) yield dramatic resonant-wavelength shifts, even with nanometer-thick films. Precise control of the refractive index and the thickness of these films was achieved by altering the relative fraction of the anionic and cationic materials combined with layer-by-layer deposition. We demonstrate the feasibility of this highly controllable deposition-technique for fine-tuning grating properties for grating applications. In addition, we confirm theoretically that the resonant wavelength shift can result from either the variation of the thickness of the film and/or the variation of its refractive index. Finally, we demonstrate that ISAMs adsorbed on LPGs function effectively as biosensors. These simulations and experimental results confirm that ISAM-coated-LPGs provide a thermally-stable, reusable, robust, and attractive platform for building efficient fiber optic sensors and devices.
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Zhiyong Wang, Zhiyong Wang, J. R. Heflin, J. R. Heflin, Kevin Vancott, Kevin Vancott, Rogers H. Stolen, Rogers H. Stolen, Siddharth Ramachandran, Siddharth Ramachandran, Samir Ghalmi, Samir Ghalmi, } "Sensitivity of long period fiber gratings to nanoscale ionic self-assembled multilayers", Proc. SPIE 5925, Nanophotonic Materials and Systems II, 59250U (12 September 2005); doi: 10.1117/12.616002; https://doi.org/10.1117/12.616002
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