Optical six-dimensional multilayer storage technology using two-photon absorption writing and erasure as well as optical coherence tomography scan reading

Abstract

The invention provides a six-dimensional optical multilayer storage method using two-photon absorption writing and erasure as well as optical coherence tomography scan reading and a device designed on the basis of the method. The storage capacity is increased and the storage performance is improved by combining three spatial dimensions with three physical dimensions including light wavelength, light intensity and light polarization. Each optical disk of DVD size of the device has large storage capacity more than 32 terabytes, ultrafast reading speed of 25 gigabits per second and ultrafast reading / erasing speed of 10 gigabits per second, the system has low light noise during data writing and erasure, and the signal-noise ratio during data reading is up to 76 decibels. Moreover, the storage capacity of each optical disk of DVD size of the device has the potential more than 1 gigabyte. The system device and the optical disk have relatively simple optical structures, facilitate light addressing on a storage unit in a fast rotating disk, and have high compatibility with CDs and DVDs. The method and the device are practical optical large-capacity storage technology.

Description

technical field [0001] The present invention relates to optical multi-dimensional data storage technology, more specifically, relates to an optical six-dimensional multi-layer storage method using two-photon absorption writing and erasing and optical coherence tomography reading and a device designed based on the method. Background technique [0002] The traditional method to achieve optical mass storage is to store data separately in a small local area in the three-dimensional space of the medium, which is called multi-layer storage, or to store data mixed and diffusely in a large overall medium, which is called Holographic storage. For traditional multi-layer or holographic storage, the main problem is the interlayer interference noise caused by numerous data layers or the holographic recording blur caused by the rotation of the disc. [0003] Another way to achieve optical mass storage is multi-dimensional storage, which uses some additional "dimensions" such as waveleng...

AI Technical Summary

Problems solved by technology

But because the super-resolution writing CD is based on bits, each of its storage units only stores 1 bit of data, that is to say, its ultra-high storage capacity is based on its ultra-small storage unit size, which will lead to several serious technical hurdles preventing the realization of the technology

These technical hurdles include: (1) the extremely difficult optical reading of data stored in nanoscale cells due to diffraction limitations; It is carried out in a bit-by-bit manner, which leads to the contradiction between unacceptably low data transmission speed and ultra-high storage capacity, and even causes it to take one to several years to read a disc; In this type of disc, the number of data layers will also be as high as 1,000 to 200,000, which will cause terrible interlayer interference noise and make writing, erasing and reading of data impossible; (4) It is too difficult to rotate the disc at a fast speed Optical addressing of nanoscale memory cells in three dimensions

Therefore, after about 20 years of research and development, super-resolution writing on optical discs is still not possible

[0006] The six-dimensional storage technology proposed two years ago also has a shortcoming, that is, its interlayer interference noise is relatively large when data is written and erased, and the interlayer interference noise is not small enough when data is read, because its data writing And erasure is based on direct optical linear absorption, that is, direct single-photon absorption, and its data reading is only filtered by confocal microscopy imaging, which reduces the quality of data recording and reading of the system

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