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Multi-dimensional optical storage method using polyacrylonitrile as optical storage medium

An optical storage medium, polyacrylonitrile technology, applied in the field of optical storage, can solve problems such as high power consumption, large power consumption, and large space occupation, and achieve the effect of reducing performance requirements, system costs, and performance requirements

Pending Publication Date: 2022-04-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using existing technology to store these data will bring two major problems: one is extremely high power consumption, and common hard drives need to consume a lot of power during use. 140 billion kWh, equivalent to 1 / 3 of the UK's annual power generation in 2013
The second is that it takes up a lot of space. The unit storage density of existing storage technologies is low. If Blu-ray discs are used to store 175ZB of data, they can be stacked to circle the earth 222 times.
However, due to the high processing threshold of fused silica, multi-dimensional optical storage systems based on fused silica often need to be equipped with high-power femtosecond lasers, and the price of this equipment is tens of millions, which seriously restricts the industrialization of multi-dimensional optical storage technology
Moreover, the nano-grating structure was only produced in a few inorganic materials such as fused silica, germanium oxide glass, sapphire, diamond, ULE glass, etc., which could not solve the problem of excessively high processing threshold of the structure, which limited the industrialization of the multi-dimensional optical storage system application

Method used

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  • Multi-dimensional optical storage method using polyacrylonitrile as optical storage medium
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  • Multi-dimensional optical storage method using polyacrylonitrile as optical storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 Corresponding to the optical path diagram of the system using the microporous structure as the storage unit.

[0035] A femtosecond laser is used to generate the required femtosecond laser pulses.

[0036] The high-speed optical switch is used to control the laser pulse switch. For example, when the written data is 0, the switch is turned off, and the material is not processed. When the written data is 1, the switch is turned on, and a micropore structure is processed in the material. The optical switch can be implemented in various ways such as galvanometer, Pockels cell, electro-optic modulator and other polarization elements combined with polarizers, which are not listed here.

[0037] Mirrors are used to reflect the light beam to the objective lens.

[0038] The objective lens is used to focus the light beam to process the material.

[0039] The sample is a polyacrylonitrile film or a polyacrylonitrile disk. Using the multiphoton absorption effect, a fem...

Embodiment 2

[0043] figure 2 Corresponding to the schematic diagram of using the second structure as a storage unit. Embodiment 2 uses processing / unprocessing to represent 0 / 1, so an optical switch can be used to control processing or not.

[0044] Specifically, the femtosecond laser generates the required femtosecond laser pulses.

[0045] The laser modulation unit is used for pulse shaping of the laser, including intensity modulation, pulse width modulation, polarization modulation, time domain modulation, etc., and can use rotatable half-wave plates, Pockels cells, electro-optic modulators, delay lines, and partial coating reflections The lens group and other components can be implemented in various ways, which are not listed here.

[0046] High-speed optical switches are used for laser pulse switching. For example, when the written data is 0, the switch is turned off, and the material is not processed. When the written data is 1, the switch is turned on, and an anisotropic structure...

Embodiment 3

[0053] image 3 Corresponding to the schematic diagram of using the third structure as a storage unit. Embodiment 3 is to process all positions of the material, and change the birefringence characteristics of the structure by modulating the laser. Therefore, the laser can be set to be normally on, and the laser modulation unit is required to dynamically adjust the parameters of the laser when processing different structures. regulation.

[0054] Specifically, the femtosecond laser generates the required femtosecond laser pulses.

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Abstract

The invention belongs to the field of optical storage, and discloses a multi-dimensional optical storage method using polyacrylonitrile as an optical storage medium, and the polyacrylonitrile can be used as the optical storage medium. According to the invention, polyacrylonitrile is used as an optical storage medium for optical storage for the first time, and when storage data is written into polyacrylonitrile, the required laser energy is obviously lower than the energy required by fused quartz processing, so that the performance requirement of a multi-dimensional optical storage system on a femtosecond laser can be greatly reduced, and the system cost is effectively reduced. Moreover, the invention also provides two optimized modified structures for laser processing, namely a microporous structure and an anisotropic structure, which are designed as storage units and can be flexibly applied.

Description

technical field [0001] The invention belongs to the field of optical storage, and more specifically relates to a multi-dimensional optical storage method in which polyacrylonitrile is used as an optical storage medium. Background technique [0002] We are entering a digital age. The digitization of the world has brought massive amounts of data. According to IDC forecasts, the global data volume will double every two years. In 2025, the total global data volume is expected to reach 175ZB (1ZB=10 9 TB=10 12 GB). Using existing technology to store these data will bring two major problems: one is extremely high power consumption, and common hard drives need to consume a lot of power during use. The electricity on the grid will reach 140 billion kwh, which is equivalent to 1 / 3 of the UK's annual electricity generation in 2013. The second is that it takes up a lot of space. The unit storage density of existing storage technologies is low. If Blu-ray discs are used to store 175Z...

Claims

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Application Information

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IPC IPC(8): G11B7/0045G11B7/005G11B7/127G11B7/128G11B7/1362G11B7/1374G11B7/244G11B7/26
Inventor 张静宇高骥超牛广达
Owner HUAZHONG UNIV OF SCI & TECH
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