Research On Structural Color Based On Surface Plasmon And All-dielectric Metasurface

Structural color refers to the color produced by the interference,diffraction and scattering of light by the micro-nano structure.Different from the color produced by the traditional pigment color filter which relies on chemical composition to absorb light.This phenomenon has changed the traditional color rendering method.With the development of micro-nano technology,the structural color can be artificially manufactured and controlled.It belongs to a kind of physical color with long service life and strong stability.Besides,it can break through the optical diffraction limit,as well as plays an important role in super-scale color filtering,multi-spectral imaging and other fields.Metal materials and dielectric materials can be utilized for the manufacturing of the structured color filter.In addition to the advantages of most structural colors,structural color filters made of metal and full dielectric materials also have the characteristics of rapid color change and high saturation color filtering.These characteristics provide ideas of the design of new structural color filters.In this paper,two structured color filters designed by the author will be introduced in detail,the main research work is as follows:1)A plasma color filter based on a rectangular array of a metal structure.By combining the surface plasmon resonance effect and the waveguide characteristics of the planar waveguide,an asymmetric rectangular metal periodic array sensitive to the polarization of the incident light is designed to dynamically adjust the transmission spectrum in the visible light range.The Finite Difference Time Domain is introduced to study the influence factors,such as array period,fill factor?thickness of dielectric and metal,polarization of incident light,of the transmission spectrum and color filter characteristics.The results showed that a transmission spectrum can be regulated by changing the period of a rectangular metal parameter array.When the period of the rectangular metal block array is asymmetric,the transmission spectrum can be dynamically adjusted by changing the polarization angle of the incident light.By adjusting the structural parameters,the transmittance of the filter can be as high as 75% in the visible light range,and the static and dynamic adjustment of the filtered color can be realized simultaneously.It provides a theoretical basis for the design of next-generation color tunable plasma color filters.2)An all-dielectric color filter based on H-type silicon nano-array.Compared with the plasmon color filter,which loses a lot in the visible light range,the all-dielectric color filter has high-quality Mie resonance in the visible light range and can produce clear colors.While comparing the H-type nanoresonator with simple structures such as nanospheres and nanocylinders,we find that it has more freedom in structural control,so it can control colors more accurately.We use the Finite Difference Time Domain(FDTD)method to explore the relationship between the structural parameters of the color filter,the Mie resonance and the color filter effect.The results show that the Mie resonance can be controlled by controlling the structural parameters.By carefully adjusting the ratio and size of the parameters,the goal of increasing the color saturation,expanding the color gamut,and performing plenoptic adjustment in the visible light range can be achieved.It provides a theoretical basis for the design of the next generation of all-dielectric color filters with expandable color gamut.What's more,important applications based on the research can be used in the fields of digital color display and color printing.3)Basic preparation scheme for using electron beams evaporation,electron beam lithography,ion beam etching and other processes to prepare thin-film color filters is proposed,which provides implementation schemes for the following device preparation and performance testing.