Highly sensitive optical response of optical fiber long period gratings to nanometer-thick ionic self-assembled multilayers

Zhiyong Wang; Heflin, J. R.; Stolen, Rogers H.; Ramachandran, Siddharth
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p223104
Academic Journal
Ionic self-assembled multilayers deposited on long period fiber gratings (LPGs) yield dramatic resonant-wavelength shifts, even with nanometer-thick films. Fine 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. In addition a variety of biological and chemical sensing agents can easily be incorporated into these films, which makes this an attractive platform for realization of high-performance LPG-based sensors.


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