Multifrequency three-dimensional optical read-only memory disks using metallic island films: preliminary experiments

摘要: Basic operation of new multifrequency three-dimensional (3-D) optical read-only memory (ROM) disks has been demonstrated experimentally. Several types metallic island film exhibiting a selectiveresonance absorption in visible-near infrared region are used as recording layers on the 3-D disks. The monochromatic light with suitable wavelength near resonance each layer is for readout information. We demonstrate that bar-code patterns recorded silver and copper can be read by using transmitted or reflected light. Furthermore, we also show ≥3 realized.