Surface-enhanced Raman scattering of amorphous silica gel adsorbed on gold substrates for optical fiber sensors

Abstract : Two kinds of gold substrates are used to produce surface-enhanced Raman scattering (SERS) of amorphous silica obtained via the sol-gel route using tetraethoxysilane Si(OC2H5)(4) (TEOS) solution. The first substrate consists of a gold nanometric film elaborated on a glass slide by sputter deposition, controlling the desired gold thickness and sputtering current intensity. The second substrate consists of an array of micrometer-sized gold inverted pyramidal pits able to confine surface plasmon (SP) enhancing electric field, which results in a distribution of electromagnetic energy inside the cavities. These substrates are optically characterized to observe SPR with, respectively, extinction and reflectance spectrometries. Once coated with thin layers of amorphous silica (SiO2) gel, these samples show Raman amplification of amorphous SiO2 bands. This enhancement can occur in SERS sensors using amorphous SiO2 gel as shells, spacers, protective coatings, or waveguides, and represents particularly a potential interest in the field of Raman distributed sensors, which use the amorphous SiO2 core of optical fibers as a transducer to make temperature measurements.
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https://hal.archives-ouvertes.fr/hal-01228769
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Submitted on : Friday, November 13, 2015 - 5:10:33 PM
Last modification on : Monday, May 20, 2019 - 2:37:07 PM

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S. Degioanni, Anne-Marie Jurdyc, A. Cheap, Bernard Champagnon, François Bessueille, et al.. Surface-enhanced Raman scattering of amorphous silica gel adsorbed on gold substrates for optical fiber sensors. Journal of Applied Physics, American Institute of Physics, 2015, 118 (15), pp.Article number: 153103. ⟨10.1063/1.4933280⟩. ⟨hal-01228769⟩

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