Metallic Nanostructure Based Plasmonic Color

Plasmonic structure colors originate from the interation between light and metallic nanostructures.Different colors can be reflected or transmitted by absorption of light of different wavelengths.The surface plasmonic structure color depends on its micro-nano structure,and has nothing to do with the color of the material itself,and has great potential in high-resolution display and data encryption.The structural color can be divided into reflective structural color and transmissive structural color.The following are the specific research contents of this article:An ultrahigh-density plasmonic color structure consists of nano-coaxial cavities on a metal film was proposed.Vivid colors displayed on this structure are largely dependent on the geometry parameters of a single coaxial cavity while less dependent on the arrangement of them.Reflectance spectra of coaxial cavities,which can be converted to colors.with varying structures are simulated by using the FDTD algorithm.According to simulated electric field distribution and charge density distribution,the dip in reflectance spectra is induced by the Fabry-Perot interference of surface plasmon waves,also called cylindrical surface plasmons,generated at the top and bottom edges of coaxial cavities.As cylindrical surface plasmon resonance was excited on the coaxial cavities,colors of coaxial cavities are dependent on the radius of gaps,the width of the gaps and height of the cavities.By adjusting coaxial cavity structure parameters,plenty of colors can be obtained with wider color gamut,good saturation,and chroma.A plasmonic color structure consists of the circular slit on a metal film was proposed.with the further research and improvement of structure,The annular cavity structure is formed into an annular slit-type transmissive structure by changing the structure of the annular cavity and etching the back surface of the annular cavity.The circular slit transmission structure color depends on the thickness of the etching,with varying parameters are simulated by using the FDTD algorithm to According to simulate the transmission spectra of different etch thickness structures and invert the structural colors.According to the simulated electric field intensity distribution analysis,the strong electric field enhancement in the annular slit depends on the interaction between the silver and air-excited surface plasmons and the silver at the annular slit notch.The gap can be changed by changing the etching thickness.The size is different,so that different transmissive structural colors are obtained.Due to the small size of the structure and the ultra-thin thickness,it plays an important role in the development of the transmissive structural color in the future.We use the self-assembled PS microsphere method and reactive ion etching and magnetron sputtering coating method to obtain the Self-Assembled Large-Area Annular Cavity Arrays,by using the FDTD algorithm to to simulate the consistency of the color of the experimentally prepared annular cavity and the ideal annular cavity.By Characterizing the experimental samples,only controlling the thickness of the silver film in the annular cavity,the prepared samples exhibit different structural colors,realizing the color display of the entire color gamut,and the size of a single structure can be manufactured at 690 nm,This provides new ideas for future high-resolution color imaging and data storage encryption.