Research On Ultra-high Resolution Image For Anti-counterfeiting Based Plasmonics

Nowadays,with the rapid development of global commodity manufacturing industry,the possessing capacity of global commodities continues to rise.Meanwhile,the flood of fake and substandard products are rampant and getting worse,which make consumers have terror in their heart and lose their faith in the commodity manufacturing industry.All those are because of the inefficient copy-prevention technology.In order to protect the interests of consumers and maintain the brand reputation of the enterprise,the development and application of new anti-counterfeiting technology,which is an important research topic in plasmonics and computer science,has become more and more vital.Whereas the tremendous recent progress in the pattern recognition algorithm,metal surface plasma resonance and nanotechnology,in this dissertation,we are going to using those theories to develop the Nano ultra-high resolution image,which is composed by gold nanodisks structures with varying diameters and gaps,for anti-counterfeiting.The specific research methods of this paper are as follows:(1)This paper utilize the commercial simulation software named FDTD Solutions to simulate the scattered spectrum of gold nanodisks array which is composed by four nanodisks(2 by 2)and get the scattered spectrum.After that,we introduce the color perception algorithm which is based on the data from CIE color space,to translate the scattered spectrum of gold nanodisks array with varying diameters and gaps into the different values in the RGB color space.Finally,we get the 81 different values in the RGB color space,which is mapping to the 81 different gold nanodisks structures,and build the color matching database composed by those 81 colors.(2)Aiming to localize the important areas of the original image,we utilize the digital image processing algorithm to detect and enhance the image edge,decompose the RGB value of the original image and normalize them.And in order to generate the MATLAB image composed by 81 colors and the purpose map,which is using to control the electron beam lithography,we introduce the color matching algorithm to compare the image after being processed with the color matching database,and get the perfect matching result.(3)In order to using the gold nanodisks array to generate the ultra-high resolution image,we utilize the electron beam lithography,which is based on the 10 nm scale image processing technology,to generate nanoscale metallic structures even with sub-10 nm gaps.As a result,that fabrication method is able to create the structure with precisely controllable shape and dimension.Using the gold nanodisks array with varying diameters from 60 nm to 140 nm and gaps from 10 nm to 90 nm,to compose the image can control every single pixel's size less than 250 nm which can break the diffraction limit.As a result,the printing technology can reach a hundred thousand dots per inch and we can generate the ultra-high resolution color image with its size around 50?m which is 104 times smaller than the original image.Moreover,human eyes cannot notice the image because of its size,so that it can be used as the optical anti-counterfeiting technology to maintain the healthy development of commodity economy.