Probing the radiative electromagnetic local density of states in nanostructures with a scanning tunneling microscope - Archive ouverte HAL Access content directly
Journal Articles ACS photonics Year : 2020

Probing the radiative electromagnetic local density of states in nanostructures with a scanning tunneling microscope

(1, 2) , (3) , (4) , (1) , (5) , (1) , (4) , (6) , (7) , (1)
1
2
3
4
5
6
7

Abstract

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.
Fichier principal
Vignette du fichier
article_platelets_revised.pdf (1.11 Mo) Télécharger le fichier
Vignette du fichier
SI_platelets_revised.pdf (1.27 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

cea-02557865 , version 1 (08-06-2020)

Identifiers

Cite

Shuiyan Cao, Mario Zapata-Herrera, Alfredo Campos, Eric Le Moal, Sylvie Marguet, et al.. Probing the radiative electromagnetic local density of states in nanostructures with a scanning tunneling microscope. ACS photonics, 2020, 7 (5), pp.1280-1289. ⟨10.1021/acsphotonics.0c00264⟩. ⟨cea-02557865⟩
177 View
209 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More