Investigating nanoplasmonics in an explicit time-dependent perspective is a natural choice when light pulses are used and may also reveal aspects that are hidden in a frequency-based picture. In the past, we proposed a method time domain-boundary element method (TD-BEM) to simulate the time dependent polarization of nanoparticles based on a boundary element method that is particularly suitable to interface with a quantum atomistic description of nearby molecules. So far, however, metal dielectric functions in TD-BEM have been modeled through analytic expressions, such as those of Debye and Drude–Lorentz, which cannot account for multiple electronic resonances. Our approach allows us to include in the TD-BEM framework also the description of metals with complicate dielectric function profiles in the frequency domain. Particularly, among all metals, gold is a challenging case due to the presence of many transition frequencies. We applied our methods to different metals (gold, silver, and the less commonly investigated rhodium) and different shaped nanoparticles (spheres, ellipsoids, and cubes), the approach has been tested comparing TD-BEM and frequency domain BEM absorption spectra, and it has been used to investigate the time-dependent field acting locally close to nanoparticle vertices.
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14 November 2020
Research Article|
November 12 2020
Real-time dynamics of plasmonic resonances in nanoparticles described by a boundary element method with generic dielectric function
Special Collection:
Spectroscopy and Microscopy of Plasmonic Systems
Giulia Dall’Osto
;
Giulia Dall’Osto
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
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Gabriel Gil
;
Gabriel Gil
a)
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
2
Instituto de Cibernética, Matemática y Física
, Calle E esq 15 Vedado, 10400 La Habana, Cuba
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Silvio Pipolo
;
Silvio Pipolo
3
Université de Lille, CNRS, Centrale Lille, ENSCL, Université d’Artois UMR 8181 Unité de Catalyse et Chimie du Solide
, F-59000 Lille, France
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Stefano Corni
Stefano Corni
b)
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
4
CNR Institute of Nanoscience
, via Campi 213/A, Modena, Italy
b)Author to whom correspondence should be addressed: [email protected]
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Giulia Dall’Osto
1
Gabriel Gil
1,2,a)
Silvio Pipolo
3
Stefano Corni
1,4,b)
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
2
Instituto de Cibernética, Matemática y Física
, Calle E esq 15 Vedado, 10400 La Habana, Cuba
3
Université de Lille, CNRS, Centrale Lille, ENSCL, Université d’Artois UMR 8181 Unité de Catalyse et Chimie du Solide
, F-59000 Lille, France
4
CNR Institute of Nanoscience
, via Campi 213/A, Modena, Italy
b)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the JCP Special Topic on Spectroscopy and Microscopy of Plasmonic Systems.
J. Chem. Phys. 153, 184114 (2020)
Article history
Received:
July 20 2020
Accepted:
October 25 2020
Citation
Giulia Dall’Osto, Gabriel Gil, Silvio Pipolo, Stefano Corni; Real-time dynamics of plasmonic resonances in nanoparticles described by a boundary element method with generic dielectric function. J. Chem. Phys. 14 November 2020; 153 (18): 184114. https://doi.org/10.1063/5.0022329
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