# Ideal magnetic dipole scattering

## TL;DR

This paper presents a method to achieve tunable ideal magnetic dipole scattering using nonmagnetic nanoparticles by suppressing electric responses and overlapping magnetic resonances with anapole modes, applicable to various geometries.

## Contribution

It introduces a novel approach to realize pure magnetic dipole scattering in nonmagnetic nanoparticles through resonance overlap techniques.

## Key findings

- Achieved ideal magnetic dipole scattering in the near-infrared spectrum.
- Demonstrated the concept with core-shell nanospheres and nanodisks.
- Showed compatibility with existing nanofabrication methods.

## Abstract

We introduce the concept of tunable ideal magnetic dipole scattering, where a nonmagnetic nanoparticle scatters lights as a pure magnetic dipole. High refractive index subwavelength nanoparticles usually support both electric and magnetic dipole responses. Thus, to achieve ideal magnetic dipole scattering one has to suppress the electric dipole response. Such a possibility was recently demonstrated for the so-called anapole mode, which is associated with zero electric dipole scattering. By overlapping magnetic dipole resonance with the anapole mode we achieve ideal magnetic dipole scattering in the far-field with tunable high scattering resonances in near infrared spectrum. We demonstrate that such condition can be realized for two subwavelength geometries. One of them is core-shell nanosphere consisting of Au core and silicon shell. It can be also achieved in other geometries, including nanodisks, which are compatible with current nanofabrication technology.