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Near- and far-field optical properties of silicon nanostructures under linearpolarization (Gaussian beam), and azimuthally or radially focused cylindricalvector beams are investigated by finite-difference time-domain method (FDTD) inMeep open-source software. A python toolkit allowing FDTD simulations in Meepfor using those excitation sources is provided. In addition to the preferentialexcitation of specific electric or magnetic resonance modes as function of theexcitation beam polarization, it is shown in the case of spheroids that shapeanisotropy affects the resonance wavelength and the dipole orientation of themagnetic or electric dipole mode. For radial or linear polarization, theelectric dipole resonance is split by an anapole mode depending on the spheroidsymmetry axis with respect to the electric field orientation. Finally, theoptical properties in both far-field (scattering pattern) and near-field(electric and magnetic field hot spots) can be tuned by changing the excitationpolarization at a fixed wavelength and selecting properly the spheroid shapeand dimensions. These numerical simulations can be extended to more complexshapes, or fabrication-friendly nanostructures such as nanocylinders withcircular or elliptic sections.

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