Models of near-field spectroscopic studies: comparison between Finite-Element and Finite-Difference methods

Thomas Grosges 1 Alexandre Vial 1 Dominique Barchiesi 1
1 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique
ICD - Institut Charles Delaunay
Abstract : We compare the numerical results obtained by the Finite Element Method (FEM) and the Finite Difference Time Domain Method (FDTD) for near-field spectroscopic studies and intensity map computations. We evaluate their respective efficiencies and we show that an accurate description of the dispersion and of the geometry of the material must be included for a realistic modeling. In particular for the nano-objects, we show that a grid size around Δρa ≈ 4πa/λ (expressed in λ units) as well as a Drude-Lorentz’ model of dispersion for FDTD should be used in order to describe more accurately the confinement of the light around the nanostructures (i.e. the high gradients of the electromagnetic field) and to assure the convergence to the physical solution.
Keywords : Numerical Approximation and Analysis Diffraction Theory Electromagnetic Theory Mie Theory Near-Field Optics Finite Element Finite Difference Time Domain
Document type :
Journal articles
Complete list of metadatas
https://hal-utt.archives-ouvertes.fr/hal-02283905
Contributor : Daniel Gavrysiak <>
Submitted on : Wednesday, September 11, 2019 - 12:27:23 PM
Last modification on : Monday, September 16, 2019 - 4:36:05 PM

Identifiers

Collections

P2MN | UTT

Citation

Thomas Grosges, Alexandre Vial, Dominique Barchiesi. Models of near-field spectroscopic studies: comparison between Finite-Element and Finite-Difference methods. Optics Express, Optical Society of America, 2005, 13 (21), pp.8483. ⟨10.1364/OPEX.13.008483⟩. ⟨hal-02283905⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

8

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD