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Use and structure of bisazo benzene polymer as two-photon optical storage medium

An optical storage medium, bisazobenzene technology, applied in multi-layer high-density optical storage, erasable two-photon polarization multi-dimensional, multi-level fields, can solve problems such as unsatisfactory, easy aggregation of azo dyes and storage effects, and achieve High concentration, large two-photon absorption cross section and optical anisotropy, the effect of inhibiting azo chromophore aggregation

Inactive Publication Date: 2010-06-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the traditional azo dye-doped host-guest polymer azo dyes used for two-photon storage, which are easy to aggregate and have unsatisfactory storage effects, and further improve the storage density, the present invention provides a bis-azobenzene polymer as a bis The use and structure of photonic optical storage media, which can not only inhibit the aggregation of azo chromophores, but also have better two-photon storage effects (higher signal contrast, better readout effect, greater storage stability) , and can realize multiple, multi-level, and multi-layer storage at the same time, opening up a new path for high-density storage

Method used

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  • Use and structure of bisazo benzene polymer as two-photon optical storage medium
  • Use and structure of bisazo benzene polymer as two-photon optical storage medium
  • Use and structure of bisazo benzene polymer as two-photon optical storage medium

Examples

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Effect test

Embodiment 1

[0028] Embodiment 1: erasure experiment

[0029] The disazobenzene chromophore undergoes orientation induced by selective isomerization during two-photon writing, resulting in anisotropy. This is a reversible process, so the two-photon storage of this material can scan the film sample 13 by adjusting the titanium: sapphire femtosecond laser 4 into circularly polarized light or changing its polarization direction through the polarizer 7 to be perpendicular to the writing light The memory area of ​​the memory is erased in order to disturb the original orientation. It can be written again after erasing.

Embodiment 2

[0030] Example 2: Polarized multiple storage

[0031] Bisazobenzene polymer is used as a two-photon storage medium. When the polarization direction of the readout light is parallel to the write light or perpendicular to the write light, a high-contrast signal can be obtained; when the polarization direction of the readout light is parallel to the write light At 45°, the signal cannot be read out. Based on this characteristic, two beams of titanium: sapphire femtosecond lasers 4 with an included angle of 45° in the polarization direction can be used to write two different data (such as two letters) in the storage medium in the same area, and then use the corresponding polarization directions respectively Optical readout can realize binary storage, and the two readout signals will not crosstalk.

Embodiment 3

[0032] Example 3: Multi-level storage

[0033] When the bisazobenzene polymer is used as a two-photon storage, the data readout intensity changes periodically with the polarization direction of the readout light. When the polarization direction of the readout light is parallel to the polarization direction of the write light, the data is a "dark spot"; when the polarization direction of the readout light is perpendicular to the polarization direction of the write light, the data is a "bright spot". Based on this characteristic, several beams of titanium:sapphire femtosecond laser 4 with different polarization directions (such as 0°, 90°) can be used to write data in different regions of the same layer, and then the same polarization direction (such as 0°, 90°) can be used to write data. ) light to read these data, the read data will show the phenomenon of different degrees of brightness (both "bright spots" and "dark spots"), and multi-level storage can be realized.

[0034] ...

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Abstract

The invention relates to an erasable two-photon polarized multivariate, multistage and multilayer optical storage technology based on a bisazo benzene polymer. The prepared bisazo benzene polymer is used as the two-photon optical storage medium. Linearly polarized titanium: sapphire laser (wavelength: 800mm, pulse cycle: 80fs and repetition frequency: 80MHz) two photons are used to write data and a reflective confocal laser scanning microscopy is used to read the data. When the bisazo benzene polymer is used for two-photon storage, if light polarization direction is read that the light polarization direction is changed from the direction in parallel with writing light to the direction forming an angle of 45 degrees with the writing light and then to the direction perpendicular to the writing light, the data undergoes a change from 'dark spot' to 'disappearance' and then to 'bright spot'. Based on the characteristic, polarized multivariate and multistage optical storage can be realized. The written data is erasable. Data can be rewritten after being erased. A composite multilayer film which takes a bisazo benzene polymer layer as a storage layer and takes a polyvinyl alcohol (PVA) layer as a spacing layer is prepared, so multilayer storage can be realized on the basis of polarized multivariate and multistage optical storage. Thereby, a new way is provided for the realization of high-density optical storage.

Description

technical field [0001] The invention relates to the technical field of two-photon optical storage, in particular to an erasable two-photon polarization multi-element, multi-level, multi-layer high-density optical storage technology based on a bisazobenzene polymer storage medium. Background technique [0002] At present, host-guest polymers doped with azo dyes have been widely used in the research of two-photon optical storage. In 2004, the US "Applied Physics Letters" (Applied Physics Letters, 2004, Volume 85, 351-353) reported the use of 800nm ​​titanium in a polymethyl methacrylate (PMMA) film doped with disperse red 1 (DR1): sapphire Femtosecond laser for two-photon polarization storage. Since DR1 is bleached during the two-photon excitation process, this is an irreversible process, which means that the two-photon storage of this material is not erasable, and it is also difficult to achieve multi-element and multi-level storage. In 2007, the U.S. "Optics Letters" (Opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/245G11B7/246C08F220/14C08F220/28C08F220/36G11B7/2467
Inventor 章周舜胡衍雷罗艳华王鑫武文轩田秀杰张其锦黄文浩邹纲
Owner UNIV OF SCI & TECH OF CHINA
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