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Published on: February 26, 2019
Enhancing the Interaction between High-Refractive Index Nanoparticles and Gold Film Substrates Based on Oblique
Yu-Lun Kuo1, Shih-Yi Chuang2, Shiuan-Yeh Chen2
1Institute of Lighting and Energy Photonics and Institute of Imaging and Biomedical Photonics, National Chiao Tung University, 301 Gaofa 3rd Road, Tainan 711, Taiwan.
Abstract:
We investigate the coupling of dipole resonances induced in a heteromaterial system composed of a high-refractive-index nanoparticle and a highly reflective substrate. A broad scattering signal and strong electric near-field enhancement in the near-infrared region are generated by a hybrid Si nanoparticle on a gold-film system under oblique illumination. Dark-field microscopy investigations of the scattering signal measurement reveal the resonance shifts of the dipole mode of silicon nanoparticles on gold films. Further, the scattering signal is enhanced for p-polarized illumination in the near-infrared region. The results indicate that the coupling of Si nanoparticles on a gold-film system facilitates a possible application for both surface-enhanced fluorescence and surface-enhanced Raman scattering.
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