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Proceedings Paper

Exploration of higher-order mode coupling in long-period gratings for sensitive monitoring of polyelectrolyte self-assembly at nanoscale
Author(s): Fei Tian; Jiri Kanka; Xiangzhi Li; Henry Du
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Paper Abstract

Layer-by-layer (LbL) self-assembly via hydrogen bonding is one of the primary mechanisms to achieve stimuliresponsive polyelectrolyte thin films for a variety of applications. The ability to monitor the individual LbL steps in situ is of great significance in the development and understanding of hydrogen-bonded LbL systems of new design functions and properties. Long-period gratings in single-mode fiber (SMF-LPG) has the potential for such application by virtue of its high index sensitivity. We report a theoretical and experimental investigation to sort out the coupled cladding mode that is most sensitive to molecular adsorption events during LbL deposition. We have undertaken a combined theoretical and experimental investigation to illustrate and demonstrate the strong correlation between the order of the coupled cladding modes in long-period gratings (LPG) in conventional single mode fiber and their sensitivity to the process of layer-by-layer (LbL) assembly of polyelectrolyte multi-layers. We show that high-order cladding modes such as LP0,10 in LPG are significantly more sensitive than their lower-order counterparts such as LP0,2, with LP0,10 yielding a shift of 1.575 nm in resonance wavelength per polyelectrolyte repeating unit of poly(vinyl pyrrolidone)/poly(methacrylic acid) bi-layer. We illustrate the potential utility of SMF-LPG integrated with stimuli-responsive LbL thin films as sensors. The integrated LPG/LbL strategy as a robust LbL test-bed has broad ramifications in exploring and exploiting sensors and devices enabled by versatile, stimuli-responsive polyelectrolyte thin films.

Paper Details

Date Published: 18 June 2014
PDF: 8 pages
Proc. SPIE 9098, Fiber Optic Sensors and Applications XI, 90980R (18 June 2014); doi: 10.1117/12.2053471
Show Author Affiliations
Fei Tian, Stevens Institute of Technology (United States)
Jiri Kanka, Institute of Photonics and Electronics of the ASCR, v.v.i. (Czech Republic)
Xiangzhi Li, Stevens Institute of Technology (United States)
Henry Du, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9098:
Fiber Optic Sensors and Applications XI
Henry H. Du; Gary Pickrell; Eric Udd; Christopher S. Baldwin; Jerry J. Benterou; Anbo Wang, Editor(s)

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