Article (Scientific journals)
Electron Energy Loss Spectroscopy of Bright and Dark Modes in Hyperbolic Metamaterial Nanostructures
Isoniemi, Tommi; Maccaferri, Nicolò; Ramasse, Quentin M. et al.
2020In Advanced Optical Materials, 8 (13), p. 2000277
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Keywords :
hyperbolic metamaterials; EELS; nanoparticles; plasmons; STEM
Abstract :
[en] Layered metal/dielectric hyperbolic metamaterials (HMMs) support a wide landscape of plasmon polariton excitations. In addition to surface plasmon polaritons, coupled Bloch-like gap-plasmon polaritons with high modal confinement inside the multilayer are supported. Photons can excite only a subset of these polaritonic modes, typically with a limited energy and momentum range in respect to the wide set of high-K modes supported by hyperbolic dispersion media, and coupling with gratings or local excitation is necessary. Strikingly, electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope allows nm-scale local excitation and mapping of the spatial field distribution of all the modes supported by a photonic or plasmonic structure, both bright and dark, and also all other inelastic interactions of the beam, including phonons and interband transitions. Herein, experimental evidence of the spatial distribution of plasmon polaritons in multilayered type II HMM nanostructures is acquired with an aloof electron beam adjacent to structures of current interest. HMM pillars are useful for their separation and adjustability of optical scattering and absorption, while HMM slot cavities can be used as waveguides with high field confinement. The nature of the modes is confirmed with corresponding simulations of EEL and optical spectra and near-field intensities.
Disciplines :
Physics
Author, co-author :
Isoniemi, Tommi
Maccaferri, Nicolò ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Ramasse, Quentin M.
Strangi, Giuseppe
De Angelis, Francesco
External co-authors :
yes
Language :
English
Title :
Electron Energy Loss Spectroscopy of Bright and Dark Modes in Hyperbolic Metamaterial Nanostructures
Publication date :
2020
Journal title :
Advanced Optical Materials
ISSN :
2195-1071
Publisher :
John Wiley & Sons, Hoboken, United States - New Jersey
Volume :
8
Issue :
13
Pages :
2000277
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 01 April 2020

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