A Shape-Engineered Surface-Enhanced Raman Scattering Optical Fiber Sensor Working from the Visible to the Near-Infrared |
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| Authors: | Antonino Foti Cristiano D’Andrea Francesco Bonaccorso Maurizio Lanza Giuseppe Calogero Elena Messina Onofrio Maria Maragò Barbara Fazio Pietro Giuseppe Gucciardi |
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| Institution: | 1. CNR-Istituto Processi Chimico-Fisici, Viale F. Stagno D’Alcontres 37, 98158, Messina, Italy
2. Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK
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| Abstract: | Surface-enhanced Raman scattering (SERS) takes advantage of the giant electromagnetic field enhancement provided by localized surface plasmons in metal nanoparticles to amplify the weak Raman scattering of the molecules. Optical fibers coated with noble metal nanoparticles can therefore be used as SERS-based sensors for remote detection of molecular species. In this article, we report on the development of an optical fiber SERS sensor capable to operate on a range of excitation wavelengths from the visible to the near-infrared. We introduce a quasistatic chemical etching protocol to engineer the tip shape and investigate the effects of the tip shape on the sensor performances. |
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