期刊
ACS PHOTONICS
卷 4, 期 5, 页码 1257-1263出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00204
关键词
electron energy-loss spectroscopy; electron beam lithography; surface plasmon; edge mode; breathing mode; aluminum plasmonic
类别
资金
- computing facility center CALMIP of the University Paul Sabatier of Toulouse
- Region Champagne-Ardenne
- Conseil General de l'Aube
- FEDER funds from the European Community
- ANR [ANR-14-CE260013]
We use electron energy loss spectroscopy (EELS) to perform a comprehensive spectroscopy and mapping of the plasmonic modes sustained by aluminum nanotriangles. Behind the apparent simplicity of such structures, a rich variety of plasmonic modes is observed. Edge modes and pseudoradial breathing modes (pseudo-RBMs) are unveiled as they couple efficiently with the electron source. We propose analytical models confirmed by rigorous simulations to index both families of modes and describe their spatial symmetry. Edge modes could be indexed as nanoantenna modes, while pseudo-RBMs match triangular cavities ones. The dispersion relation of both modes is measured highlighting their different nature. Plasmonic resonances ranging from near-infrared (IR) to ultraviolet (UV) are obtained by varying the triangle sizes, and especially, we found pseudo-RBMs resonances in the UV region, making them interesting for UV applications.
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