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Laminated optical waveguide 3D data memory and its duble-beam record and read-out method

A three-dimensional data and memory technology, applied in the field of optical information storage, can solve the problems of limiting the number of data readouts, and achieve the effects of eliminating the limitation of repeated data readout times, high sensitivity, and suppressing interlayer crosstalk effects

Inactive Publication Date: 2004-08-04
NANJING NORMAL UNIVERSITY
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Problems solved by technology

The readout sensitivity of the fluorescence excitation method is much greater than that of the phase contrast and interference methods, but the fluorescence readout process is accompanied by the signal attenuation of the recorded data (erasing effect), which is a destructive data readout process, which limits the number of data readouts

Method used

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  • Laminated optical waveguide 3D data memory and its duble-beam record and read-out method
  • Laminated optical waveguide 3D data memory and its duble-beam record and read-out method
  • Laminated optical waveguide 3D data memory and its duble-beam record and read-out method

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Embodiment Construction

[0022] The memory unit is composed of multiple planar optical waveguides, and each waveguide is composed of a core layer, a cladding layer and a substrate, and the refractive indices are n 1 , n 2 and n 3 . If the refractive index of the core, cladding and substrate satisfies the condition n 1 >n 2 ≥n 3 , the light will be totally reflected on the cladding-core and core-substrate interfaces, the light beam will be confined in each waveguide, and the propagation of light will not be visible from the direction perpendicular to the waveguide surface. The cladding layer of each waveguide is made of photosensitive material, which is used as a recording layer to store data; the core layer is made of non-photosensitive material, which is used as an addressing layer to conduct addressing beams; the substrate is also made of non-photosensitive material, As an isolation layer, it can prevent double-sided leakage and eliminate interlayer crosstalk during data recording and readout. ...

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Abstract

The present invention relates to light information storing technology and is especially the 3D record and read-out method of data in laminated planar optical waveguide. There are two record light beams, one entering from the upper part of the optical waveguide and the other the side. The record light beams are focused to the record layer of the waveguide sheet to make the medium in the focus change in physical property to produce default in the waveguide to record signal, "0" or "1". The physical change may be change in refractive index, density or others of the medium. The double-beam record method needs non-linear medium material, and the quickly elapsing wave penetrating from the core layer to the coating layer can not change the medium alone, and only the simultaneous action of record beam and the addressing beam the information can be recorded.

Description

1. Technical field [0001] The invention belongs to the optical information storage technology, and in particular relates to a method for realizing three-dimensional recording and reading of data information by using a multi-layer planar optical waveguide structure. 2. Background technology [0002] Optical data storage technologies such as CD and DVD discs have been widely used in the fields of audio-visual audio-visual and computer data storage. At present, people are trying to find ways to further increase the storage density of the optical disc memory, such as using a large numerical aperture objective lens or using a short-wavelength light source. However, today's optical disc storage area density is close to the spatial resolution limit caused by the electromagnetic wave diffraction effect, and the next generation of ultra-high-density optical storage will be based on the near-field optical storage technology that breaks through the diffraction resolution limit (T.D.Mil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/004G11B7/0045G11B7/005G11B7/127G11B7/24038G11C13/04
Inventor 梁忠诚谢勇
Owner NANJING NORMAL UNIVERSITY
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