All-dielectric Colored Truncated Cone Metasurfaces With Silicon Mie Magnetic Resonators

Color and decoration are essential for perceiving and recognizing natural and man-made objects.Color is produced by the resonant interaction of light with the discrete harmonic energy states of the smallest substances(atoms and molecules).Compared with pigment color,structural color has the advantages of high color saturation,beautiful color,and not easy to fade,which has been widely studied by scholars.Nanostructure color is the color produced by the interaction between visible light and nanostructure.Plasma based printing technology has been widely studied for its great advantage over organic pigments and dyes.In practice,however,only a few metals can be used in plasma-structured displays because of the high loss of metals in visible light.In addition,due to the intrinsic characteristics of plasma damping,the color spectrum coverage generated by metal nanoparticles is small,and metal particles mainly have quasi-electrical resonance,so another degree of magnetic resonance mode is urgently needed to control the color generated by the structure.This article takes the all-dielectric metasurface as the research object,focuses on the analysis theory and design method of the all-dielectric metasurface,and completes the all-dielectric color metasurface design based on Mie resonance.Specific research content and innovation results are as follows:Here we propose circular truncated cone shaped metasurfaces based on mainly magnetic Mie resonances and carry out numerical simulations of the structure.Because magnetic resonances are the primary modes,and the strength of which is much larger than that of electric resonances.From numerical simulation,the intensity of the reflection peak reaches almost 90%and full width at half-maximum(FWHM)of which is around 43nm.The proposed structure works with a low aspect ratio(0.46)which can largely relieve the difficulty of process manufacturing.More detailed numerical analysis shows that distinct colors can be obtained giving a spatial resolution around 85000dpi.due to excellent properties of mangetic Mie resonances.High quality colors with high hue and saturation are available by selecting the appropriate geometric dimension and period of the arrays.Besides polarization-independence,another outstanding feature of the designed metasurfaces is the ability to use cost-effective,stable,and sustainable as well as CMOS-compatibale materials to provide well-defined colors covering the entile visible spectrum.