Three-dimensional super-resolution light-induced magnetization spot arrays

We present a method for generating three-dimensional super-resolution light-induced magnetization spot arrays with multiple degrees of freedom in the focal region of a 4π-focusing system. By employing the radiation of an orthogonal dipole pair (ODP) with a phase difference of π/2, the required illumination field of the focusing system is derived through a reversing calculation. Based on the vectorial Debye diffraction theory and the inverse Faraday effect (IFE), the tightly focused field and its induced magnetization field are quantitatively evaluated. The results demonstrate that the light-induced magnetization field exhibits super-resolved dimensions, and its orientation can be arbitrarily controlled by adjusting the ODP direction. Furthermore, ODPs are utilized as elements to form antenna arrays with diverse configurations. By optimizing the amplitude and phase modulation of individual array elements, we obtain the illumination at the pupil plane for the desired magnetization fields. The results reveal the generation of a 3D super-resolved magnetization spot array with uniform intensity, where the orientation of each magnetization spot can be independently tailored. This all-optical control of super-resolved magnetization spot array provides a theoretical and technical framework for developing high-density, large-capacity, low-energy-consumption, and high-speed all-optical magnetic storage technologies, demonstrating broad application potential in magneto-optical data storage.