Magnetic metamaterials in the blue range using aluminum nanostructures

TL;DR

This paper demonstrates the design and analysis of aluminum nanoparticle arrays that exhibit strong magnetic responses and negative permeability in the blue to visible spectrum, combining experimental and theoretical approaches.

Contribution

It introduces aluminum nanostructure-based metamaterials capable of operating across the entire visible range, with validated experimental and computational results.

Findings

Strong magnetic response observed down to 400 nm

Negative permeability achieved in aluminum nanostructures

Theoretical models agree with experimental data

Abstract

We report an experimental and theoretical study of the optical properties of two-dimensional arrays of aluminum nanoparticle in-tandem pairs. Plasmon resonances and effective optical constants of these structures are investigated and strong magnetic response as well as negative permeability are observed down to 400 nm wavelength. Theoretical calculations based on the finite-difference time-domain method are performed for various particle dimensions and lattice parameters, and are found to be in good agreement with the experimental results. The results show that metamaterials operating across the whole visible wavelength range are feasible.