Enhanced write-once optical storage capacity of Cu3N film by coupling with an Al2O3 protective layer

A novel write-once optical storage device with large-capacity storage was designed and constructed based on Cu3N film. In this work, Cu3N films were deposited on the glass substrates by DC magnetron sputtering at room temperature. After coating with the absorbed and protective layers, the sandwich-like devices were irradiated by the pulsed laser through the different mask templates to record the informations (letters matrix “IAM”). The results demonstrate that the informations were stored accurately and efficiently through the observation of confocal microscope. After coating with the protective layer (Al2O3), the storage capacity was found to be improved dramatically. According to the unique advantages of the device, such as the intrinsic low decomposition temperature of Cu3N and the protection of stable Al2O3 layer, we have successfully assembled a novel write-once optical storage device with noteworthy storage capacity.