A scalable pathway to nanostructured sapphire optical fiber for evanescent-field sensing and beyond

0457460 - ÚFE 2016 RIV US eng J - Journal Article
Chen, H. - Tian, F. - Kaňka, Jiří - Du, H.
A scalable pathway to nanostructured sapphire optical fiber for evanescent-field sensing and beyond.
Applied Physics Letters. Roč. 106, č. 11 (2015), s. 1111021-1111025. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA MŠMT(CZ) LH11038
Institutional support: RVO:67985882
Keywords : Aluminum coatings * Nano-structured * Silver nanoparticles
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering
Impact factor: 3.142, year: 2015

e here report an innovative and scalable strategy of transforming a commercial unclad sapphire optical fiber to an all-alumina nanostructured sapphire optical fiber (NSOF). The strategy entails fiber coating with metal aluminum followed by anodization to form alumina cladding of highly organized pore channel structure. Through experiments and numerical simulation, we demonstrate the utility and benefit of NSOF, analogous to all-silica microstructured optical fiber, for evanescent-field surface-enhanced Raman scattering (SERS) measurements. We experimentally reveal the feasibility of Ag nanoparticles (NPs)-enabled NSOF SERS sensing of 10(-6) M Rhodamine 6G (R6G) after thermal treatment at 500 degrees C for 6 h by taking advantage of porous anodic aluminum oxide (AAO) structure to stabilize the Ag NPs. We show, via numerical simulations, that AAO cladding significantly increases the evanescent-field overlap, lower porosity of AAO results in higher evanescent-field overlap, and optimized AAO nanostructure yields greater SERS enhancement
Permanent Link: http://hdl.handle.net/11104/0257860