Engineered Near-and Far-Field Optical Response of Dielectric Nanostructures using Focused Cylindrical Vector Beams - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Applied Physics Année : 2022

Engineered Near-and Far-Field Optical Response of Dielectric Nanostructures using Focused Cylindrical Vector Beams

Résumé

Near-and far-field optical properties of silicon nanostructures under linear polarization (Gaussian beam), and azimuthally or radially focused cylindrical vector beams are investigated by finite-difference time-domain method (FDTD) in Meep open-source software. A python toolkit allowing FDTD simulations in Meep for using those excitation sources is provided. In addition to the preferential excitation of specific electric or magnetic resonance modes as function of the excitation beam polarization, it is shown in the case of spheroids that shape anisotropy affects the resonance wavelength and the dipole orientation of the magnetic or electric dipole mode. For radial or linear polarization, the electric dipole resonance is split by an anapole mode depending on the spheroid symmetry axis with respect to the electric field orientation. Finally, the optical properties in both far-field (scattering pattern) and near-field (electric and magnetic field hot spots) can be tuned by changing the excitation polarization at a fixed wavelength and selecting properly the spheroid shape and dimensions. These numerical simulations can be extended to more complex shapes, or fabrication-friendly nanostructures such as nanocylinders with circular or elliptic sections.
Fichier principal
Vignette du fichier
Montagnac_JAP_CVB.pdf (14.85 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03848736 , version 1 (10-11-2022)

Identifiants

Citer

Martin Montagnac, Gonzague Agez, Adelin Patoux, Arnaud Arbouet, Vincent Paillard. Engineered Near-and Far-Field Optical Response of Dielectric Nanostructures using Focused Cylindrical Vector Beams. Journal of Applied Physics, 2022, 131 (13), pp.133101. ⟨10.1063/5.0085940⟩. ⟨hal-03848736⟩
35 Consultations
20 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More