Generating Sub–Wavelength Longitudinal Magnetization Chains using High NA Lens System

This study investigates the light-induced magnetization distribution produced by a closely focused, azimuthally polarized Laguerre-Bessel-Gaussian beam, which is superimposed with a helical phase and modulated by an optimized multi-belt complex phase filter (MBCPF). Utilizing vector diffraction theory and the inverse Faraday Effect, we numerically analyze the resulting magnetization patterns. Our findings reveal that by adjusting the radii of the complex phase filter's rings, various novel magnetization focal distributions can be achieved. These include the formation of multiple sub-wavelength spherical magnetization spots arranged in chains of two, three, five, and seven. These configurations are particularly suitable for applications such as transporting multiple magnetic particles, storing multilayer magneto-optical data, developing ultra-compact optomagnetic devices, and fabricating magnetic lattices for spin wave operations.