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

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7 Author(s)
Xu, Xiaobin ; Materials Science and Engineering Program, Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA ; Hasan, Dihan ; Wang, Lei ; Chakravarty, S.
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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.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 19 )

Date of Publication:

May 2012

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