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Guided-mode-resonance-coupled plasmonic-active SiO₂ nanotubes for surface enhanced Raman spectroscopy

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  • We demonstrate a surface enhanced Raman scattering (SERS) substrate by integrating plasmonic-active SiO₂ nanotubes into Si₃N₄ gratings. First, the dielectric grating that is working under guided mode resonance (GMR) provides enhanced electric field for localized surface plasmon polaritons on the surface of metallic nanoparticles. Second, we use SiO₂ nanotubes with densely assembled silver nanoparticles to provide a large amount of "hot spots" without significantly damping the GMR mode of the grating. Experimental measurement on Rhodamine-6G shows a constant enhancement factor of 8 ~ 10 in addition to the existing SERS effect across the entire surface of the SiO₂ nanotubes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4714710]
  • Keywords: Silver Electrode, Single Molecule, Scattering, SERS
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  • Xu, X., Hasan, D., Wang, L., Chakravarty, S., Chen, R., Fan, D., & Wang, A. (2012). Guided-mode-resonance-coupled plasmonic-active SiO2 nanotubes for surface enhanced raman spectroscopy. Applied Physics Letters, 100(19) doi: 10.1063/1.4714710
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  • 100
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  • 19
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  • The authors would like to acknowledge the support from the National Institutes of Health (NIH) under the Small Business Technology Transfer Research (STTR) program (Grant No. 1R41EB012885-01), Welch Foundation F-1734.
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