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Nanostructured Sapphire Optical Fiber for Evanescent-Field Sensing

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Abstract

We 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. We experimentally demonstrated Ag nanoparticles (NPs)-enabled NSOF for SERS sensing of 10−6 M Rhodamine 6G (R6G) after thermal treatment at 500 °C for 6 hours. We numerically show that AAO cladding significantly increases the evanescent-field overlap, lower porosity of AAO results in higher evanescent-field overlap.

© 2015 Optical Society of America

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