Special scattering regimes for conical all-dielectric nanoparticles

TL;DR

This paper explores how truncated cone dielectric nanoparticles exhibit various scattering regimes, including Kerker effects, anapole states, and superscattering, due to their broken symmetry, simplifying fabrication and enabling advanced nano-optical applications.

Contribution

It demonstrates that simple truncated cone geometries can achieve complex scattering phenomena, offering a fabrication-friendly approach to control light-matter interactions at the nanoscale.

Findings

Realization of generalized and transverse Kerker effects.

Achievement of non-scattering hybrid anapole regime.

Observation of superscattering regimes.

Abstract

All-dielectric nanophotonics opens a venue for a variety of novel phenomena and scattering regimes driven by unique optical effects in semiconductor and dielectric nanoresonators. Their peculiar optical signatures enabled by simultaneous electric and magnetic responses in the visible range pave a way for a plenty of new applications in nano-optics, biology, sensing, etc. In this work, we investigate fabrication-friendly truncated cone resonators and achieve several important scattering regimes due to the inherent property of cones - broken symmetry along the main axis without involving complex geometries or structured beams. We show this symmetry breaking to deliver various kinds of Kerker effects (Generalized and Transverse Kerker effects), non-scattering hybrid anapole regime (simultaneous anapole conditions for all the multipoles in a particle leading to the nearly full scattering suppression) and, vice versa, superscattering regime. Being governed by the same straightforward geometrical paradigm, discussed effects could greatly simplify the manufacturing process of photonic devices with different functionalities. Moreover, the additional degrees of freedom driven by the conicity open new horizons to tailor light-matter interactions at the nanoscale.