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Proceedings Paper

The Fano resonance in quasi-3D gold plasmonic nanostructure arrays for surface-enhanced Raman scattering
Author(s): Daqian Wang; Xinglong Yu; Qiuming Yu
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Paper Abstract

We demonstrate that the Fano resonances can be generated in a quasi-3D (Q3D) plasmonic nanostructure array fabricated on an indium tin oxide (ITO) coated glass substrate because of the interference between the broad plasmon modes of the gold nanodiscs and the narrow waveguide mode of the dielectric waveguide of the ITO layer. The finite-difference time-domain (FDTD) simulations were performed to investigate the far-field reflectance spectra and the near-field electric field distributions. The Q3D plasmonic nanostructure arrays were fabricated on ITO coated glass substrates via electron beam lithography (EBL) and the reflectance spectra were measured and compared to the simulation results. The effect of the Fano resonances on surface-enhanced Raman scattering (SERS) was studied. The results show that a strong enhancement can be achieved by tuning the narrow Fano resonance near the excitation wavelength and the broad plasmon resonance covering both the excitation and the Stokes Raman scattering wavelengths.

Paper Details

Date Published: 9 October 2012
PDF: 7 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 845717 (9 October 2012); doi: 10.1117/12.930423
Show Author Affiliations
Daqian Wang, Univ. of Washington (United States)
Tsinghua Univ. (China)
Xinglong Yu, Tsinghua Univ. (China)
Qiuming Yu, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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