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Observation of the plasmon mode transition from triangular to hexagonal nanoplates
Keisuke Imaeda1, Seiju Hasegawa2, Kohei Imura2
1Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan.
The Journal of Chemical Physics
|February 2, 2022
Summary
Altering the shape of gold nanoplates impacts their plasmonic cavity modes. Tip truncation modifies optical selection rules and energy, guiding the design of plasmonic devices.
Area of Science:
- Plasmonics and Nanophotonics
- Materials Science and Engineering
Background:
- The optical properties of metal nanostructures are critically dependent on their geometrical configuration.
- Plasmonic cavity modes, which arise from light confinement in nanostructures, are key to their optical functionality.
Purpose of the Study:
- To investigate how geometrical modifications, specifically tip truncation, affect plasmonic cavity modes in two-dimensional gold nanoplates.
- To understand the influence of varying truncation sizes on the optical selection rules and energy of these modes.
Main Methods:
- Experimental characterization using near-field transmission measurements on triangular and tip-truncated triangular gold nanoplates.
- Numerical simulations were performed on nanoplates with diverse snipping (truncation) sizes to analyze geometrical effects.
Main Results:
- Plasmonic cavity modes in tip-truncated nanoplates were found to be qualitatively similar to those in untruncated triangular nanoplates for minor truncation.
- Numerical simulations revealed that tip truncation significantly influences both the optical selection rules and the energy of plasmonic cavity modes.
Conclusions:
- Geometrical modifications, particularly tip truncation, offer a method to tune the optical behavior of plasmonic cavities.
- These findings provide essential insights for the rational design of plasmonic nanostructures with tailored optical functionalities.
