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Merging individual metal nanostructures into a superstructure for plasmon mode hybridization and electric-field nanofocusing

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Abstract

Geometry design based plasmon hybridization represents an efficient means for pursuing desired spectral response and near-field enhancement in hybrid structures. Here, we propose to merge individual metal nanostructures into a superstructure to simultaneously realize plasmon mode inheritance and hybridization and electric near-field nanofocusing. As a model demonstration, we combine a metal nanoring supporting two localized surface plasmon resonances (LSPRs) and a metal nanocone sustaining one LSPR and one propagating surface plasmon polaritons (SPPs) mode into a hollow nanocone superstructure, and show numerically that such superstructure exhibits multiple plasmon resonance bands in the visible and near-infrared range and efficient nanofocusing of electric near-fields to the nanocone open apex. We further fabricate the designed superstructure with an ion-track membrane template method that allows for flexible control over relevant structural parameters by varying track etching time. Dark-field scattering measurements on single hollow nanocones confirm the presence of multiple plasmon resonances; surface-enhanced Raman spectroscopy further corroborates that the nanofocusing of electric fields plays a critical role in signal enhancement. We believe that such multi-resonant plasmonic superstructures with efficient near-field nanofocusing capability can find great potential in fundamental nonlinear optics and hot-carrier science studies and practical applications in surface-enhanced spectroscopies and broadband solar light harvesting.

Graphical abstract: Merging individual metal nanostructures into a superstructure for plasmon mode hybridization and electric-field nanofocusing

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Article information


Submitted
18 Mar 2020
Accepted
08 Jun 2020
First published
09 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Merging individual metal nanostructures into a superstructure for plasmon mode hybridization and electric-field nanofocusing

Z. Zhao, G. Xu, J. Zhang, Y. Zhang, J. Liu, S. Lyu, H. Cheng, D. Lei and J. Duan, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01394C

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