In this paper, we report the influence of laser intensity on small dimensions of the microstructure for both exposure of graphic zone and blank zone. Also, the one-time electroplate technology and the two-time electroplate technology were conducted for production of optical discs. A series of laser intensities (30mW, 30%, 35%, 40%, 45%, 50%, 55%) are conducted through laser direct writing. The micropore size increased with the laser intensity for exposure of graphic zone to the laser which leaving holes on the surface of master disc, while the micropore size decreased with laser intensity for exposure of blank zone which leaving bosses on the surface master disc. Moreover, the optimum laser intensity is found to be 45% for both one-time electroplating and two-time electroplating. The micropore size remains the same size during the whole process indicating the excellent stability and reliability of the process. In addition, the demolding process during the production of optical disc is smooth due to the controlled angle between photoresist and nickel surface. However, the height of microstructure boss on the optical disc after injection molding depended on the size of the microstructure. The height of the boss was 150nm for 2μm zone while it was only 80nm for 1μm zone. This work proves the feasibility and potential use of a new physical format for long-life holographic storage disc, which may break monopolies in optical storage field, by applying one-time electroplating and two-time electroplating method.
In this work, we report the influence of laser intensity, via laser direct writing focus on a photoresist, on the different dimensions of the microstructure. A series of laser intensities (30mW, 30%, 35%, 40%, 45%, 50%, 55%) are conducted and the reaction mechanism between laser and photoresist is also proposed. The microstructure size increased with laser intensity and the optimum laser intensity is found to be 45% for both 2μm and 4μm microstructure. The micropore size remains the same size during the whole process (master disc-nickel disc-son disc) indicating the excellent stability and reliability of the process. Additionally, the demolding process during the production of son disc is smooth due to the controlled angle between Ni base surface and photoresist. This work proves the feasibility and compatibility of the production of a new physical format for long-life holographic storage disc, which significantly increase the storage density, access speed and shelf life compared to traditional disc, by applying traditional processing method (master disc-Ni discson disc).
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