All-Optical Nanometric Switch based on the Directional Scattering of Semiconductor Nanoparticles

TL;DR

This paper proposes an all-optical nanometric switch using a silicon nanoparticle dimer that exploits directional scattering and wavelength modulation for high-contrast optical switching.

Contribution

It introduces a novel silicon nanoparticle dimer design that achieves optical switching through directional scattering control in the visible range.

Findings

Achieved maximum contrast through numerical optimization of nanoparticle spacing and wavelength.

Demonstrated sensitivity of scattering conditions to incident wavelength for switching.

Analyzed near-field and far-field electric field distributions for the proposed design.

Abstract

A structure based on a dimer of silicon nanoparticles, presenting directional scattering in the visible range, was studied as a new design of an all-optical switch. The combination of spherical nanoparticles satisfying, at the same incident wavelength, the zero-backward and the minimum-forward scattering conditions, can produce either a maximum or a minimum of the scattered field in the area between the nanoparticles. The modulation of the incident wavelength can be used as switching parameter, due to the sensitivity of these conditions to it. An optimization of the dimer setup, both in the distance between the nanoparticles and the incident wavelength, was numerically performed to obtain a maximum contrast. Also, near-field and far-field distributions of the electric field have been considered.