Publication detail

Spatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennas

HORÁK, M. KONEČNÁ, A. ŠIKOLA, T. KŘÁPEK, V.

Original Title

Spatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennas

Type

journal article in Web of Science

Language

English

Original Abstract

Electron energy loss spectroscopy (EELS) is often utilized to characterize localized surface plasmon modes supported by plasmonic antennas. However, the spectral resolution of this technique is only mediocre, and it can be rather difficult to resolve modes close in the energy, such as coupled modes of dimer antennas. Here, we address this issue for a case study of the dimer plasmonic antenna composed of two gold discs. We analyze four nearly degenerate coupled plasmon modes of the dimer: longitudinal and transverse bonding and antibonding dipole modes. With a traditional approach, which takes into account the spectral response of the antennas recorded at specific points, the modes cannot be experimentally identified with EELS. Therefore, we employ the spectral and spatial sensitivity of EELS simultaneously. We propose several metrics that can be utilized to resolve the modes. First, we utilize electrodynamic simulations to verify that the metrics indeed represent the spectral positions of the plasmon modes. Next, we apply the metrics to experimental data, demonstrating their ability to resolve three of the above-mentioned modes (with transverse bonding and antibonding modes still unresolved), identify them unequivocally, and determine their energies. In this respect, the spatio-spectral metrics increase the information extracted from electron energy loss spectroscopy applied to plasmonic antennas.

Keywords

electron energy loss spectroscopy; hybridization; localized surface plasmon; spectrum image

Authors

HORÁK, M.; KONEČNÁ, A.; ŠIKOLA, T.; KŘÁPEK, V.

Released

19. 6. 2023

Publisher

WALTER DE GRUYTER GMBH

Location

BERLIN

ISBN

2192-8606

Periodical

Nanophotonics

Year of study

12

Number

15

State

Federal Republic of Germany

Pages from

3089

Pages to

3098

Pages count

10

URL

https://doi.org/10.1515/nanoph-2023-0153

Full text in the Digital Library

http://hdl.handle.net/11012/213827

BibTex

@article{BUT184195,
  author="Michal {Horák} and Andrea {Konečná} and Tomáš {Šikola} and Vlastimil {Křápek}",
  title="Spatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennas",
  journal="Nanophotonics",
  year="2023",
  volume="12",
  number="15",
  pages="3089--3098",
  doi="10.1515/nanoph-2023-0153",
  issn="2192-8606",
  url="https://doi.org/10.1515/nanoph-2023-0153"
}