期刊
NANO LETTERS
卷 15, 期 2, 页码 1229-1237出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5043775
关键词
nanooptics; plasmonics; electron energy loss spectroscopy; cathodoluminescence; bright and dark modes; light scattering
类别
资金
- French State [ANR-10-EQPX-50]
- HYNNA project
- French General Directorate for Armament
- European Union [n312483, 262348]
- Sao Paulo Research Foundation (FAPESP) [2011/05989-5, 2013/06167-4]
- JAE from CSIC
- European Research Council [267867]
- ICREA Funding Source: Custom
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/05989-5] Funding Source: FAPESP
Plasmon modes of the exact same individual gold nanoprisms are investigated through combined nanometer-resolved electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements. We show that CL only probes the radiative modes, in contrast to EELS, which additionally reveals dark modes. The combination of both techniques on the same particles thus provides complementary information and also demonstrates that although the radiative modes give rise to very similar spatial distributions when probed by EELS or CL, their resonant energies appear to be different. We trace this phenomenon back to plasmon dissipation, which affects in different ways the plasmon signatures probed by these techniques. Our experiments are in agreement with electromagnetic numerical simulations and can be further interpreted within the framework of a quasistatic analytical model. We therefore demonstrate that CL and EELS are closely related to optical scattering and extinction, respectively, with the addition of nanometer spatial resolution.
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