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Static and Dynamic Near-Field Measurements of High-Order Plasmon Modes Induced in a Gold Triangular Nanoplate
The Journal of Physical Chemistry Letters
|July 10, 2018
Summary
Understanding plasmon spatiotemporal properties is key for plasmonic nanoparticle applications. This study reveals out-of-plane plasmon modes in gold nanoplates have longer dephasing times, making them ideal for enhanced performance.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Precise understanding of plasmon spatiotemporal characteristics is crucial for advancing plasmonic nanoparticle applications.
- High-order plasmon modes in nanostructures offer unique optical properties but require detailed characterization.
Purpose of the Study:
- To investigate the spatiotemporal properties of high-order plasmon modes in a gold triangular nanoplate.
- To compare the dephasing dynamics of in-plane and out-of-plane polarized plasmon modes.
Main Methods:
- Utilized static and dynamic near-field transmission measurements.
- Performed near-field two-photon excitation imaging.
- Conducted time-resolved autocorrelation measurements to analyze plasmon dephasing.
Main Results:
- Simultaneous excitation and spectral/spatial overlap of in-plane and out-of-plane plasmon modes were observed.
- Plasmon dephasing led to correlation widths broader than the excitation pulse.
- Experimentally demonstrated that out-of-plane plasmon modes possess longer dephasing times than in-plane modes.
Conclusions:
- The out-of-plane plasmon mode exhibits superior dephasing characteristics.
- Out-of-plane plasmon modes are advantageous for enhancing plasmonic device performance.
- These findings provide insights for designing advanced plasmonic nanoparticles.
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