A Luneburg lens for spin waves
arXiv:1807.06705 · doi:10.1063/1.5049470
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.
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- Spin-Wave Optical Elements: Towards Spin-Wave Fourier Optics
- Spin-wave Talbot effect in thin ferromagnetic film
- Reversible tuning of omnidirectional band gaps in two-dimensional magnonic crystals by magnetic field and in-plane squeezing
- Off-axial focusing of spin-wave lens in the presence of Dzyaloshinskii-Moriya interaction
- Sub-micrometer near-field focusing of spin waves in ultrathin YIG films
- Spin-Wave Self-Imaging: Experimental and Numerical Demonstration of Caustic and Talbot-like Diffraction Patterns
- Magnetic skyrmion generation by reflective spin-wave focusing
- Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width
- Chiral Magnonic Resonators: Rediscovering the Basic Magnetic Chirality in Magnonics
- Spin-wave Goos-Hänchen effect induced by 360 degree domain walls in magnetic heterostructures