期刊
ACS PHOTONICS
卷 5, 期 3, 页码 861-866出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01060
关键词
plasmonics; electron energy loss spectroscopy; cathodoluminescence; transmission electron microscopy; nanoparticles
类别
资金
- FWF SFB NextLite [F4905-N23]
- ESTEEM2 (FP7 project) [312483]
- NAWI Graz
- Graz Centre for Electron Microscopy (ZFE)
Due to a vanishing dipole moment, radial breathing modes in small flat plasmonic nanoparticles do not couple to light and have to be probed with a near-field source, as in electron energy loss spectroscopy (EELS). With increasing particle size, retardation gives rise to light coupling, enabling probing breathing modes optically or by cathodoluminescence (CL). Here, we investigate single silver nanodisks with diameters of 150-500 nm by EELS and CL in an electron microscope and quantify the EELS/CL ratio, which corresponds to the ratio of full to radiative damping of the breathing mode. For the investigated diameter range, we find the CL signal to increase by about 1 order of magnitude, in agreement with numerical simulations. Due to reciprocity, our findings corroborate former optical experiments and enable a quantitative understanding of the light coupling of dark plasmonic modes.
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