The Fano resonance in quasi-3D gold plasmonic nanostructure arrays for surface-enhanced Raman scattering

Daqian Wang; Xinglong Yu; Qiuming Yu

doi:10.1117/12.930423

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9 October 2012 The Fano resonance in quasi-3D gold plasmonic nanostructure arrays for surface-enhanced Raman scattering

Daqian Wang, Xinglong Yu, Qiuming Yu

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Proceedings Volume 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X; 845717 (2012) https://doi.org/10.1117/12.930423
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

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.

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Daqian Wang, Xinglong Yu, and Qiuming Yu "The Fano resonance in quasi-3D gold plasmonic nanostructure arrays for surface-enhanced Raman scattering", Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 845717 (9 October 2012); https://doi.org/10.1117/12.930423

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