New functional materials and devices based on metal patterns can be widely used in many new and expanding industries,such as flat panel displays, alternative energy,sensors and so on. In this paper, we introduce a new transfer printing method for fabricating metal optics functional devices. This method can directly transfer a metal pattern from a polyethylene terephthalate (PET)supported UV or polydimethylsiloxane (PDMS) pattern to another PET substrate. Purely taking advantage of the anaerobic UV curing adhesive (a-UV) on PET substrate, metal film can be easily peeled off from micro/nano-structured surface. As a result, metal film on the protrusion can be selectively transferred onto the target substrate, to make it the metal functional surface. But which on the bottom can not be transferred. This method provides low cost fabrication of metal thin film devices by avoiding high cost lithography process. Compared with conventional approach, this method can get more smooth rough edges and has wider tolerance range for the original master mold. Future developments and potential applications of this metal transfer method will be addressed.
Composed by thousands of microsphere-like structures on the surface, the plastic surface relief diffuser film with
different transmittance and haze will be designed by optical simulation software. By using laser etching process, the
molding will be fabricated on the self-developed equipment with nanosecond diode pumped solid state laser. Finally, the roll to roll UV curing process will be used for fabricating the diffuser film based on polycarbonate material. The
relationship between the optical performance and the structure parameter and its distribution will be investigated. The optical performance of diffuser films will be tested by surface profiler, and spectrophotometer. These results will
contribute to the design and production of customized diffuser films.
Indium tin Oxide (ITO) is widely used in touch panel as a conductive material. However, it is fragile and has low transparency in low resistance. In this paper, a ITO-free transparent conductive film (TCF) has been proposed. Micronano structured patterns are designed to induce the silver paste composed by nano silver particles and organic solvents, which form the circuit of touch panel sensor conveniently. Mesh patterns are fabricated by UV nanoimprinting technology to form microgrooves on flexible polymer films coated by UV adhesive such as PET (polyethylene terephthalate). And then nano silver ink is filled into the grooves which constitute the conductive area of the TCF. The optical performance including the transmittance and haze of the TCF is tested. Finally, the TCF with the transmittance 87% and the square resistance less than 50 Ω/sq will be obtained, which can satisfy the applications in touch panel devices.
A five-inch light guide plate by arranging special cone dots on the surface of optical polycarbonate film was designed.
Then an optical model was built by using TracePro and the luminance distribution of the light guide was simulated by
using ray tracing method to achieve an efficient and uniform radiation of light from the light-guide. The above light
guide was fabricated by roll to roll hot embossing process instead of injection molding. The fabrication of the hotembossing
mold was investigated. Finally, a 5 inch light guide with the average luminance greater than 3000 cd/m2 and
the uniformity above 80% was fabricated. This process will contribute to the production of an ultra slim light guide in
Multilayer light guide films(MLGF) with LED lighting for multifunctional display has been proposed. Based on the
MLGF technology, keys can be illuminated separately on different mode. The fabrication process similar to LIGA
technology including laser etching, electroforming and hot nanoimprinting is developed. The depth of the light guide
dots can be controlled by laser pulse numbers and the influence of dots depth to the luminance uniformity is simulated.
The MLGF sample composed of 2 layers is designed and fabricated, the total thickness the module is about 0.4mm and
the depth of light guide dots ranges from 0.5 um to 10um.The optical performances testing results are given. MLGF
provides an ultrathin solution for multifunctional keypad and the fabrication process is high throughput, low cost for
large area light guide films.
We propose a new method of digital watermarking with the double binary optical phase encoding technique. The iterative Fourier transform algorithm (IFTA) is used to generate the binary phase structures. The combination of two binary phase structures, in which one is used to encode the hidden image and the other is used as the encryption phase key, is inserted as a watermark into the host image. The effects of phase levels of binary phase holograms on the quality of extracted image are analyzed, and the results show that the 2/2 phase level combination is a better scheme for watermarking than other multiple combinations. We also present the principle of the encrypting key. Both analysis and experimental results illustrate that this technique is of high security and robust against the printing and scanning process.
We propose a new method of digital watermarking with double binary optical phase encoding technique. Design procedures base on iterative Fourier transform algorithm (IFTA). The combination of two binary phase structures, in which one is used to encode the hidden image, and the other as encryption phase key, is inserted as watermark into the host image. The affections of phase levels of binary phase holograms on the quality of extracting watermark from the watermarked image have been analyzed, and results show that the 2/2 phase level combination is the best scheme of watermarking than other multiple combinations. The principle of encrypting the private key has been presented. This method can effectively increase the security of digital hologram watermarking and support the hard output of the watermarked image. The watermark is robust against hard output. We analysis the influence on the quality of extracted image after the processing of printing and scanning. We also develop the software tool for the watermarking process. The experimental results are given.