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Enhanced discretization of surface integral equations for resonant scattering analysis of sharp-edged plasmonic nanoparticles
- Source :
- UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC)
- Publication Year :
- 2019
- Publisher :
- American Physical Society (APS), 2019.
-
Abstract
- The surface integral equation (SIE) method, discretized with the method of moments, is a well-established methodology for the scattering analysis of subwavelength plasmonic nanoparticles. SIEs are usually discretized with low-order basis functions that preserve the normal continuity of the surface currents across the edges arising in the meshed boundary, such as Rao-Wilton-Glisson (RWG) functions. However, the plasmonic enhancement modeling on sharp-edged particles is an extremely challenging task, especially due to the singular fields exerted at sharp corners, exposing a slow (or no) convergence in the computation of the scattering and absorption spectra. In this paper, we propose an alternative discretization strategy based on a discontinuous basis function set in conjunction with a volumetric-tetrahedral testing scheme. We demonstrate the potential of the proposed discretization scheme by studying scattering and absorption spectra of three canonical plasmonic polyhedra, i.e., a hexahedral, an octahedral, and a tetrahedral silver inclusion. The results expose an improved accuracy and faster convergence in both far-field and near-field regions when compared to the standard RWG implementation. The proposed discretization scheme can offer faster and more accurate routes towards the exploration and design of the plasmonic resonant spectrum of sharp-edged nanoparticles and nanoantennas.
- Subjects :
- Fotonics
Camps de galga (Física)
Discretization
ta221
Fotònica
Physics::Optics
Basis function
02 engineering and technology
Method of moments (statistics)
Discrete dipole approximation
METAL NANOPARTICLES
01 natural sciences
ELECTROMAGNETIC SCATTERING
Electromagnetic interactions
0103 physical sciences
Strong electromagnetic field effects
SENSORS
Comunicacions òptiques
DISCRETE DIPOLE APPROXIMATION
Electromagnetic wave theory
010306 general physics
FORMULATIONS
Physics
Anàlisi numèrica
Plasmonic nanoparticles
Electromagnetic field calculations
Optics & lasers
ta114
Scattering
Optical communications
NANOCUBE
Quàntums, Teoria dels
Gauge fields (Physics)
OPTICAL-PROPERTIES
Enginyeria de la telecomunicació [Àrees temàtiques de la UPC]
Finite-element method
021001 nanoscience & nanotechnology
FIELDS
Finite element method
Computational physics
SILVER
Tetrahedron
MODES
Plasmonics
0210 nano-technology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC)
- Accession number :
- edsair.doi.dedup.....580c8adbc0584e517e69ceee96489a70