- Title
- Multipolar and dark-mode plasmon resonances on drilled silver nano-triangles
- Creator
- Fletcher, Glen; Arnold, Matthew D.; Pedersen, Therese; Keast, Vicki J.; Cortie, Michael B.
- Relation
- ARC.DP120102545
- Relation
- Optics Express Vol. 23, Issue 14, p. 18002-18013
- Publisher Link
- http://dx.doi.org/10.1364/OE.23.018002
- Publisher
- Optical Society of America
- Resource Type
- journal article
- Date
- 2015
- Description
- Dark-mode plasmon resonances can be excited by positioning a suitable nano-antenna above a nanostructure to couple a planar incident wave-front into a virtual point source. We explore this phenomenon using a prototypical nanostructure consisting of a silver nanotriangle into which a hole has been drilled and a rod-like nano-antenna of variable aspect ratio. Using numerical simulations, we establish the behavior of the basic drilled nanotriangle under plane wave illumination and electron beam irradiation to provide a baseline, and then add the nano-antenna to investigate the stimulation of additional dark-mode plasmon resonances. The introduction of a suitably tuned nano-antenna provides a new and general means of exciting dark-mode resonances using plane wave light. The resulting system exhibits a very rich variety of radiant and sub-radiant resonance modes.
- Subject
- nanoparticles; plasmon resonances; multipolar resonances; magnetic fields
- Identifier
- http://hdl.handle.net/1959.13/1331507
- Identifier
- uon:26653
- Identifier
- ISSN:1094-4087
- Language
- eng
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