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Exploration of Higher-Order Mode Coupling in Long-Period Gratings for Sensitive Monitoring of Polyelectrolyte Self-Assembly at Nanoscale
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SYSNO ASEP 0436244 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Exploration of Higher-Order Mode Coupling in Long-Period Gratings for Sensitive Monitoring of Polyelectrolyte Self-Assembly at Nanoscale Author(s) Tian, F. (US)
Kaňka, Jiří (URE-Y)
Li, X. (US)
Du, H. (US)Number of authors 4 Source Title Fiber Optic Sensors and Applications XI, 9098 - Proc. of SPIE. - Bellingham : SPIE, 2014 / Du H. Henry ; Pickrell Gary ; Udd Eric - ISSN 0277-786X - ISBN 9781628410358 Pages 90980r1-90980r8 Number of pages 8 s. Publication form Print - P Action Fiber Optic Sensors and Applications XI Event date 08.05.2014-09.05.2014 VEvent location Baltimore Country US - United States Event type WRD Language eng - English Country US - United States Keywords Long-period grating ; single mode fiber ; mode coupling Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering R&D Projects LH11038 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support URE-Y - RVO:67985882 UT WOS 000345069900019 EID SCOPUS 84907367584 DOI 10.1117/12.2053471 Annotation 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 Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2015
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