Polarization balance measurement reading method and device based on nano photoetching optical disc
A reading device and polarization direction technology, applied in the optical field, can solve problems hindering the development of optical disc technology, and achieve the effect of improving information storage dimension, storage density and storage capacity, and high stability
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no. 1 example
[0050] Such as figure 1 shown, where figure 1 The left figure in the middle shows an optical disc physical storage medium. The writing method based on nanolithography and the polarization balance measurement and reading method described in this application are both applied to the optical disc physical storage medium. Its structure includes:
[0051] 1) protective layer 101, which enables the optical disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the optical disc;
[0052] 2) Absorption modulation layer 102, the material of this layer has absorption modulation characteristics, and the thickness of this layer is less than 500nm. The absorption modulation layer materials include diarylethene, fulginic anhydride materials, and azide materials, but are not limited to these;
[0053] 3) The birefringence writing recording layer 103 is used for writing and recording information. This layer is characterized ...
no. 2 example
[0059] A. The writing method based on nanolithography and the polarization balance measurement reading method described in this application are combined with 2 m Bit multi-level information encoding method. Such as figure 1 In the middle right figure, assuming m=3, different groove depths Z are performed at (1), (2), and (3) at the fixed recording position 112 on the birefringent writing recording layer 103 1 ,Z 2 ,Z 3 The continuous writing of , wherein, writing at the corresponding (m) means that the recording point "1" is recorded at this place, otherwise it is "0", and different (m) corresponds to 2m Different digits in the bit coding; so far, the information recording at the fixed recording position 112 is completed, and then move to the next fixed position according to the example direction of 111, and repeat the above process to complete the data recording; and so on, complete the whole process of data storage .
[0060] Among them, for X m The bit multi-level info...
no. 3 example
[0087] In this embodiment, steps S302-S304 are the main process of the polarization balance measurement and reading method. The principle of the polarization balance measurement reading method is as follows Figure 4 shown. As shown in the figure, the polarization direction of the linearly polarized light beam 401 is fixed at 402, and the incident perpendicular to the optical axis of the birefringent material 403 is divided into two beams of o light and e light due to the birefringent effect. Since the incident perpendicular to the optical axis, the two beams The beam beams are not separated in space, as shown in 404; the propagation distance in the birefringent material is d, because the birefringent material has different absorption rates for the S and P polarization components of o light and e light, so that o light and e light The polarization of the light changes at a certain angle, as shown in 405; the polarization direction of the beam after the action of the birefring...
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