期刊
NANOSCALE
卷 14, 期 23, 页码 8362-8373出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nr01402e
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资金
- Croucher Foundation (Croucher Senior Research Fellowships 2020)
- Hong Kong Government (Research Matching Grant Scheme) [8601434]
- Juan de la Cierva Fellowship [FJC2018-036104-I]
This study demonstrates a dual-channel plasmonic system that separates the excitation and emission processes, offering a higher degree of freedom for the manipulation of light-matter interaction. The system consists of high-aspect-ratio Ag nanorods and Si substrates, generating intensive local field enhancement.
Optical antenna effects endow plasmonic nanoparticles with the capability to enhance and control various types of light-matter interaction. Most reported plasmonic systems can be regarded as single-channel nanoantennas, which rely only on a bright dipole plasmon mode for energy exchange between near- and far-field. Herein we demonstrate a dual-channel plasmonic system that can separate the excitation and emission processes into two energy exchange pathways mediated by the different plasmon modes, offering a higher degree of freedom for the manipulation of light-matter interaction. Our system, consisting of high-aspect-ratio Ag nanorods and Si substrates, can support a series of bright and dark plasmon modes with distinct near- and far-field properties and generate relatively intensive local field enhancement in the gap region. As a proof-of-principle, we take plasmon-enhanced fluorescence of dye molecules as an example to reveal the energy exchange mechanism in the dual-channel plasmonic system. Such a system is potentially also useful for manipulating other types of light-matter interaction. Our work represents a step toward the utilization of a broader class of plasmon resonance for the development of optical antennas and various on-chip nanophotonic components.
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