Magnetic field concentration with coaxial silicon nanocylinders in optical spectral range

TL;DR

This paper theoretically investigates how silicon nanocylinders, with and without coaxial holes, can concentrate magnetic fields at optical resonances, achieving up to 26-fold enhancement useful for nanoantennas and nanolasers.

Contribution

It introduces a full-wave numerical analysis of magnetic field enhancement in silicon nanocylinders with coaxial holes, revealing new possibilities for magnetic field control at optical frequencies.

Findings

Magnetic field can be enhanced up to 26 times at optical resonances.

Coaxial holes in nanocylinders influence magnetic field distribution.

Results enable design of nanoantennas and nanolasers with magnetic optical transitions.

Abstract

Possibility of magnetic energy accumulation inside silicon nanoparticles at the conditions of resonant optical responses is investigated theoretically. The magnetic field distributions inside silicon nanocylinders with and without coaxial through holes are calculated using full-wave numerical approach. It is demonstrated that such systems can be used for control and manipulation of optical magnetic fields providing their enhancement up to 26 times at the condition of optical resonances. Obtained results can be used for realization of nanoantennas and nanolasers, in which magnetic optical transitions play significant roles.