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Magnetism

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Published on: November 21, 2019

Active magneto-optical metalens.

Forouzan Habibighahfarokhi, Olga Sergaeva, Costantino De Angelis

|September 23, 2025

Summary

This summary is machine-generated.

Researchers created a magnetic metalens using bismuth-substituted yttrium iron garnet nanodisks. This polarization-sensitive device actively controls light focusing by switching circular polarization handedness with a magnetic field.

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Area of Science:

Metasurface optics
Magneto-optic effects
Nanophotonics

Background:

Metasurfaces offer novel optical functionalities.
Controlling light polarization with external stimuli is crucial for active optical devices.
Bismuth-substituted yttrium iron garnet (BIG) exhibits tunable magneto-optic properties.

Purpose of the Study:

To demonstrate a polarization-sensitive metalens based on BIG nanodisks.
To investigate the magnetic field modulation of light focusing.
To establish a framework for active magnetic metadevices.

Main Methods:

Fabrication of a metasurface composed of BIG nanodisks.
Full-wave electromagnetic simulations to analyze device performance.
Evaluation of nanodisk response, phase profile, and focusing efficiency under varying magnetic fields and light polarizations.

Main Results:

The BIG nanodisk metasurface demonstrated polarization-sensitive focusing.
Switching incident circularly polarized light handedness resulted in distinct focusing behaviors.
Simulations confirmed the magnetic field's ability to modulate the metalens' optical response.

Conclusions:

A functional polarization-sensitive metalens was realized using BIG nanodisks.
The device's optical response is actively tunable via an external magnetic field.
This work provides a foundation for developing magnetically controlled active metadevices.