Optical Switching Layer for Rewirtable Volumetric Optical Disks

Abstract

Owing to the presence of out-of-focus recording layers in volumetric optical disks, laser energy is decreased in reading/writing the targeted active layer. A non-linear optical material as an optical switch added to recording layers is proposed to modulate the optical characteristics of recording layers by diffraction limit laser spot impinged on it or not. The added optical switching structure can reduce laser energy and to increase recording sensitivity for reading and recording, respectively. Consequently, reading/recording on active layers of volumetric optical disks can be optimized.

Fabrication and nonlinear optical properties of nanoparticle silver oxide films

“…Therefore, it can be used as an optical switching layer in the phase-change volumetric optical recording systems. 22 The absorption spectra of AgO x thin films with different particle sizes and annealing conditions are shown in Fig. 7: ͑a͒ as-deposited; annealed at ͑b͒ 220°C for 30 s with an average particle size of 47 nm, ͑c͒ 220°C for 3 min with an average particle size of 66 nm, ͑d͒ 220°C for 5 min with an average particle size of 84 nm, and ͑e͒ 220°C for 10 min with an average particle size of 87 nm.…”

Performance of a write-once multilayer optical disk that uses transparent recording material with an optical switching layer

“…1 To resolve these issues, an optical switching layer was introduced into a volumetric optical disk. 2,3 In this paper we demonstrate that a disk structure with multiple transparent films and optical switching layers as the recording medium in-creases the number of recording layers in a volumetric optical disk.…”