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Advantage of multi-mode sapphire optical fiber for evanescent-field SERS sensing
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SYSNO ASEP 0436258 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Advantage of multi-mode sapphire optical fiber for evanescent-field SERS sensing Author(s) Chen, H. (US)
Tian, F. (US)
Chi, J. (US)
Kaňka, Jiří (URE-Y)
Du, H. (US)Number of authors 5 Source Title Optics Letters. - : Optical Society of America - ISSN 0146-9592
Roč. 39, č. 20 (2014), 5822-5825Number of pages 4 s. Publication form Print - P Language eng - English Country US - United States Keywords Fiber optics sensors ; Backscattering ; Nanomaterials 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 000343912000009 EID SCOPUS 84908102161 DOI 10.1364/OL.39.005822 Annotation An unclad, multi-mode single crystal sapphire fiber was used as a platform, and immobilized colloidal Ag nanoparticles (NPs) were used as enabler, for evanescent-field fiber-optic sensing via surface-enhanced Raman scattering (SERS) of Rhodamine 6G (R6G) solution. The dependence of the measured Raman intensity on NP coverage density (to a maximum of 120 particles/μm2) as well as the coverage length (to a maximum of 6 cm) was investigated. We demonstrate the utility of SERS-active sapphire fibers for sensitive measurements (10-8 M R6G). We further reveal, with the aid of theoretical analysis, that multi-mode fiber offers a significant advantage compared to its single-mode counterpart because the former allows two orders of magnitude higher particle coverage density than the latter to maximize SERS benefit, while maintaining the dominance of Raman gain despite the competitive interplay of NP-induced absorption and scattering loss along the interaction path length 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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