Effective control of the optical absorption properties of FeGa micro-nano spherical shell arrays

With the development of micro-nano optical technology, the fine and effective regulation of the optical properties of nano-arrays by adjusting their structures, sizes and morphologies has become a new research hotspot. In this work, a series of FeGa micro-nano spherical shell arrays with different diameters and thicknesses on polystyrene spheres (PS) templates using magnetron sputtering is synthesized. By applying an external magnetic field perpendicular to the FeGa arrays and adjusting its intensity, the efficient and reversible control of the intensities and positions of light peaks in the optical absorption spectra of the arrays is realized. Among them, the regulation of light absorption can reach ∼15%. Furthermore, the experimental results are in good agreement with the numerical simulation of the multi-physical field coupling analysis. These results will provide a method to control light absorption and contribute to the research and development of emerging optical devices.