Sensitivity of long period fiber gratings to nanoscale ionic self-assembled multilayers

Zhiyong Wang, J. R. Heflin, Kevin Vancott, Rogers H. Stolen, Siddharth Ramachandran, Samir Ghalmi

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


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-coaled-LPGs provide a thermally-stable, reusable, robust, and attractive platform for building efficient fiber optic sensors and devices.

Original languageEnglish (US)
Article number59250U
Pages (from-to)1-10
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
Externally publishedYes
EventNanophotonic Materials and Systems II - San Diego, CA, United States
Duration: Jul 31 2005Aug 1 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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