A Luneburg lens for spin waves
Applied Physics
2018-12-05 v1 Materials Science
Abstract
We report on the theory of a Luneburg lens for forward-volume magnetostatic spin waves, and verify its operation via micromagnetic modelling. The lens converts a plane wave to a point source (and vice versa) by a designed graded index, realised here by either modulating the thickness or the saturation magnetization in a circular region. We find that the lens enhances the wave amplitude by 5 times at the lens focus, and 47% of the incident energy arrives in the focus region. Furthermore, small deviations in the profile can still result in good focusing, if the lens index is graded smoothly.
Keywords
Cite
@article{arxiv.1807.06705,
title = {A Luneburg lens for spin waves},
author = {N. J. Whitehead and S. A. R. Horsley and T. G. Philbin and V. V. Kruglyak},
journal= {arXiv preprint arXiv:1807.06705},
year = {2018}
}