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Manipulation of the dephasing time by strong coupling between localized and propagating surface plasmon modes
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Manipulation of the dephasing time by strong coupling between localized and propagating surface plasmon modes
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Journal Article
Manipulation of the dephasing time by strong coupling between localized and propagating surface plasmon modes
2018
Overview
Strong coupling between two resonance modes leads to the formation of new hybrid modes exhibiting disparate characteristics owing to the reversible exchange of information between different uncoupled modes. Here, we realize the strong coupling between the localized surface plasmon resonance and surface plasmon polariton Bloch wave using multilayer nanostructures. An anticrossing behavior with a splitting energy of 144 meV can be observed from the far-field spectra. More importantly, we investigate the near-field properties in both the frequency and time domains using photoemission electron microscopy. In the frequency domain, the near-field spectra visually demonstrate normal-mode splitting and display the extent of coupling. Importantly, the variation of the dephasing time of the hybrid modes against the detuning is observed directly in the time domain. These findings signify the evolution of the dissipation and the exchange of information in plasmonic strong coupling systems and pave the way to manipulate the dephasing time of plasmon modes, which can benefit many applications of plasmonics.
Strong coupling between two resonant modes is a prerequisite for many scientifically and technologically interesting effects. Here, Yang et al. demonstrate strong coupling between localized and propagating plasmon modes with a splitting energy of 144 meV and controllable dephasing times.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
