Multi-dimensional optical storage disc and data read-out method thereof

Abstract

The invention discloses a multi-dimensional optical storage disc. According to the invention, multi-dimensional optical storage recording pits in different depths and angles are etched on a disc recording layer; and multi-wavelength read-write material is deposited on the surface of the disc sheet. The invention further provides a data read-out method based on the disc, which particularly comprises the following steps: the mixture lasers in different wavelengths can be focused on the disc recording pits in different depths and angles, so as to receive the reflected lights of each recording pit; the recording pit depth can be identified according to the phase position of the reflected light of each recording pit; the recording pit angle can be identified according to the polarization of the reflected light of each recording pit; the lasers are ordered according to the amplitude value of the reflected light of the lasers in different wavelengths in combination with the recording pits; and the disc storage data can be decoded according to the recording pit depth, the recording pit angle and the laser ordering result. According to the invention, the binary two-dimensional recording for traditional optical storage is switched to multi-nary multi-dimensional recording and more information can be stored in individual recording position, thereby greatly boosting the storage capacity of the disc.

Description

Technical field [0001] The invention belongs to the technical field of photoelectric information storage, and specifically relates to a method for preparing a multi-dimensional optical storage optical disc and its data reading. Background technique [0002] Since Charles H. Towns invented the laser in 1960, optical storage has truly entered people's lives. The principle of optical storage is to focus the laser to its diffraction limit to form an optical recording bit on the storage medium. The laser diffraction limit satisfies the following formula: [0003] D = 1.22 λ NA [0004] Where λ is the laser wavelength, NA is the numerical aperture of the focusing lens. For decades, the development of optical storage technology has continued to reduce the laser wavelength λ and increase the lens numerical aperture NA, CD (λ=780nm, NA=0.45, capacity 0.7GB); DVD (λ=650nm, NA =0.6, 4.7GB capacity); Blue DVD (λ=405nm, NA=0.85, capacity 25GB). However, with the rapid develo...

AI Technical Summary

Problems solved by technology

Among them, the near-field optical storage technology is based on the principle of super-diffraction resolution near-field optics. A mask layer is added at a distance of about 10-20nm from the recording layer in the disc. Based on the near-field enhancement effect and the near-field surface plasmon effect, the mask layer is Nano-sized evanescent field is generated under laser irradiation, and the diameter of the spot generated in the near-field area is smaller than the diffraction limit resolution size, so as to realize near-field super-resolution recording. The single-chip storage capacity reaches 300GB, but the signal-to-noise ratio of this method is low , poor readout stability, and the difficulty in controlling the distance between the high-speed rotating recording disk and the near-field optical head have been difficult to solve completely; holographic optical storage technology is based on the principle of double-beam interference, using high-density spatial light modulators (SLM) And CCD photodetector array, the information is recorded in the storage medium in the form of diffraction pattern, and its single chip storage capacity can reach TB level, but this method is difficult to be backward compatible, the system cost is too high, and depends on materials, detectors Arrays and a series of other technical fields have developed, so its industrialization and marketization are still difficult

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