Roles of multipolar resonances and dual plasmonic modes for SERS hot spots

Hui-Hsin Hsiao; Hao Ke; Mykhaylo Dvoynenko; Juen-Kai Wang

doi:10.1117/12.2567972

20 August 2020 Roles of multipolar resonances and dual plasmonic modes for SERS hot spots

Hui-Hsin Hsiao, Hao Ke, Mykhaylo Dvoynenko, Juen-Kai Wang

Proceedings Volume 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII; 114620T (2020) https://doi.org/10.1117/12.2567972
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

The hexagonal silver-nanoparticles (Ag-NPs) array grown in self-assembled anodic aluminum oxide (AAO) nanochannels have been successfully demonstrated to show reliable enhanced Raman-scattering signal. In this work, we systematically explored the roles of multipolar resonances for Ag-NP/AAO substrates in affecting the signal amplification, the background noise, as well as the signal-to-noise ratio at three typical wavelengths for Raman spectroscopy (532 nm, 633nm, and 785 nm). In addition, a duel-resonant system consisting of Ag-NPs embedded in a sinusoidal-shaped AAO/Al substrate was also investigated. The grating structure enables the excitation of surface plasmon polaritons (SPPs) to further couple with the generated hots spots between adjacent Ag-NPs and meanwhile provides a diffraction dispersion which is beneficial for spectral detection.

Conference Presentation

Citation Download Citation

Hui-Hsin Hsiao, Hao Ke, Mykhaylo Dvoynenko, and Juen-Kai Wang "Roles of multipolar resonances and dual plasmonic modes for SERS hot spots", Proc. SPIE 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII, 114620T (20 August 2020); https://doi.org/10.1117/12.2567972

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