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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU148668" target="_blank" >RIV/00216305:26620/23:PU148668 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1515/nanoph-2023-0153" target="_blank" >https://doi.org/10.1515/nanoph-2023-0153</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/nanoph-2023-0153" target="_blank" >10.1515/nanoph-2023-0153</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/GA22-04859S" target="_blank" >GA22-04859S: Heat-driven phase transition in plasmonic nanostructures probed by analytical electron microscopy</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nanophotonics

ISSN

2192-8606

e-ISSN

2192-8614

Volume of the periodical

12

Issue of the periodical within the volume

15

Country of publishing house

DE - GERMANY

Number of pages

10

Pages from-to

3089-3098

UT code for WoS article

001014805500001

EID of the result in the Scopus database

2-s2.0-85164027972