期刊
ACS PHOTONICS
卷 7, 期 5, 页码 1280-1289出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00264
关键词
electromagnetic local density of states; inelastic electron tunneling; electron energy loss spectroscopy; surface plasmon; scanning tunneling microscopy
类别
资金
- China Scholarship Council (CSC) [201304910386]
- European Union under the Project H2020 FETOPEN-2016-2017 FEMTO-TERABYTE [737093]
- Colombian Administrative Department of Science, Technology and Innovation - COLCIENCIAS
- HAPPLE grant (French National Research Agency) [ANR-12-BS10-0016]
- Conseil Regional, Ile-deFrance (DIM Nano-K)
- Spanish MICINN [FIS201680174-P]
- Basque Government [IT1164-19]
A novel technique for the investigation of the radiative contribution to the electromagnetic local density of states is presented. The inelastic tunneling current from a scanning tunneling microscope (STM) is used to locally and electrically excite the plasmonic modes of a triangular gold platelet. The radiative decay of these modes is detected through the transparent substrate in the far field. Emission spectra, which depend on the position of the STM excitation, as well as energy-filtered emission maps for particular spectral windows are acquired using this technique. The STM-nanosource spectroscopy and microscopy results are compared to those obtained from spatially resolved electron energy loss spectroscopy (EELS) maps on similar platelets. While EELS is known to be related to the total projected electromagnetic local density of states, the light emission from the STM-nanosource is shown here to select the radiative contribution. Full electromagnetic calculations are carried out to explain the experimental STM data and provide valuable insight into the radiative nature of the different contributions of the breathing and edge plasmon modes of the nanoparticles. Our results introduce the STM-nanosource as a tool to investigate and engineer light emission at the nanoscale.
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