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2015 ; 2
(10
): 1429-1435
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Full Three-Dimensonal Reconstruction of the Dyadic Green Tensor from Electron
Energy Loss Spectroscopy of Plasmonic Nanoparticles
#MMPMID26523284
Hörl A
; Trügler A
; Hohenester U
ACS Photonics
2015[Oct]; 2
(10
): 1429-1435
PMID26523284
show ga
Electron energy loss spectroscopy (EELS) has emerged as a powerful tool for the
investigation of plasmonic nanoparticles, but the interpretation of EELS results
in terms of optical quantities, such as the photonic local density of states,
remains challenging. Recent work has demonstrated that, under restrictive
assumptions, including the applicability of the quasistatic approximation and a
plasmonic response governed by a single mode, one can rephrase EELS as a
tomography scheme for the reconstruction of plasmonic eigenmodes. In this paper
we lift these restrictions by formulating EELS as an inverse problem and show
that the complete dyadic Green tensor can be reconstructed for plasmonic
particles of arbitrary shape. The key steps underlying our approach are a generic
singular value decomposition of the dyadic Green tensor and a compressed sensing
optimization for the determination of the expansion coefficients. We demonstrate
the applicability of our scheme for prototypical nanorod, bowtie, and cube
geometries.