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Characterization of Overlapped Plasmon Modes in a Gold Hexagonal Plate Revealed by Three-Dimensional Near-Field
Takuya Matsuura1, Keisuke Imaeda2, Seiju Hasegawa1
1Department of Chemistry and Biochemistry, School of Advanced Science and Engineering , Waseda University , Shinjuku , Tokyo 169-8555 , Japan.
The Journal of Physical Chemistry Letters
|February 9, 2019
Summary
This study reveals how to distinguish overlapping plasmon modes in gold nanoplates using 3D near-field measurements. This technique allows for selective visualization of individual plasmon modes, crucial for plasmonics applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Spectroscopy
Background:
- Characterizing plasmon modes is vital for understanding plasmon behavior and enabling practical applications.
- High-order plasmon modes in nanostructures exhibit complex near-field behaviors.
Purpose of the Study:
- To investigate the 3D near-field characteristics of high-order plasmon modes in a gold hexagonal nanoplate.
- To differentiate spectrally and spatially overlapped in-plane and out-of-plane plasmon modes.
Main Methods:
- Utilized three-dimensional near-field spectroscopy to probe plasmon modes.
- Performed detailed near-field measurements on a gold hexagonal nanoplate.
- Analyzed the influence of probe tip-sample distance on mode visualization.
Main Results:
- Observed spectrally and spatially overlapped in-plane and out-of-plane plasmon modes near 900 nm.
- Demonstrated that out-of-plane modes confine electromagnetic fields more tightly than in-plane modes.
- Showed that in-plane modes become dominant with increasing probe tip-sample distance.
Conclusions:
- Three-dimensional near-field measurements can selectively visualize individual plasmon modes.
- This technique is effective even when multiple plasmon modes are spectrally and spatially overlapped.
- Findings advance the understanding and manipulation of plasmon modes in nanostructures.
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