News source: stor-age.com
Israel Mempile cooperation with the CD-ROM manufacturers MemoryTech trial out of the disc capacity of more than 300GB. The disc through the use of two-photon absorption effect, so that the disc has a 0.6mm thick transparent layer of 100 records. Mempile was the end of February 2007, for Israel's AV equipment manufacturers that record and play shows.
Mempile technology based on ultra-high two-photon absorption capacity of current DVD and CD
next generation optical disc using the multi-layered technology, by improving the recording layer is laid below the transmittance of light reflective film, the laser reaches the bottom of the recording layer. recording layer more arrived in the lower laser intensity is weak. Therefore, to achieve a maximum level of 10 ~ 20 . Moreover, since the need to drill the formation of the disc recording layer, there is the problem of higher manufacturing costs.
contrast, Mempile company called two-photon absorption by using nonlinear optical effects to achieve a multi-layered. two-photon absorption is the molecular composition of the recording layer by simultaneous absorption of two photons, structural changes in materials, fluorescent phenomenon. because of the level of responsiveness is proportional to incident light, so the response can limit the location of the laser focus . Because the light recording material itself, through the higher, and use than the traditional method of reflective film, can increase the number of recording layer.
Mempile company recorded material by increasing the sensitivity of the interval between the upper and lower recording layer down to the 5 ~ 6mm. so, 0.6mm thick recording material layer can hold 100 records. records, all use a red laser to read. records using two-photon absorption effect is due to records of material changes, the effect during playback is triggered by read the green fluorescence.
the disc will be the first win in 3 years for enterprise data storage, digital AV equipment and future consumer electronics products will also be included in the application field of view. in the future, Mempile company will also the thickness of the disc's recording layer 1mm to 200 layers, and increases the capacity of each to the same with the DVD 5GB, for the capacity of 1TB.
because the disc will enter the field of consumer electronics market, can say exactly and focus on the professional use of the holographic recording the contrary. Therefore, Memplie from the initial stages of the development of cooperation and development, estimated to have a fancy MemoryTech manufacturing cost reduction techniques.
this CD will be used for the consumer electronics, Mempile and MemoryTech What efforts have made it? Naoki Asakawa reporter interviewed Mempile Ortal Alpert, chief technology officer and Mempile's CTO, chairman and former chief technology officer MemoryTech Kanji Katsuura.
Mempile's CTO Ortal Alpert
how fancy your two-photon absorption effect?
Alpert: continue with the current optical disc technology to expand capacity through multi-layered there is a limit. Previously, many companies have tried multi-layered Blu-ray disc, but the final number of layers can be achieved at most 6 to 8 layer. and manufacturing costs are high, not practical.
If you are using our technology can be steep rise to 200 layers. because the use of two-photon absorption, not only eliminates the need for layers of reflective film, can also reduce the up and down crosstalk between the recording layer. Meanwhile, you can also control the CD and DVD manufacturing costs a considerable level.
Our technology uses the same red laser with the DVD to record the broadcast signal. each capacity is quite basic and DVD level mm5GB. each 5GB, 200 layers, then, we can achieve 1TB capacity.
had also been done using two-photon absorption of the disc, but still quite far from practical. your company is how to achieve 300GB capacity?
Alpert: The most important thing is we developed a recording material, not only recording, playback, also applied the principle of two-photon absorption.
previous studies have been largely applied to record the two-photon absorption dent (Pit ), and play, then read the dent in the reflectivity or refractive index, they use a single photon. and our technology, also used during playback to stimulate two-photon absorption recording materials, read the recording material to fluoresce. also used in the play by two-photon absorption, can significantly reduce the upper and lower signal interference.
so that the interval between the upper and lower recording layer can be reduced to 5mm. to 1.2mm thick layer of the media can have more than 200 recording layer space.
Please elaborate on the development of the recording material.
Alpert: In the introductory material before more specific in explaining the principle of recording and playback. two-photon absorption of the recording and playback are using a red laser wavelength of 645nm. recorded data , the use of high-intensity laser recording material. In this way, the focus can be generated around the two-photon absorption. At this time, recording material is absorbed and two 645nm photons, which is equivalent to the 323nm UV photon energy, then fired. In this way, recording material that there is no reversible changes in molecular structure to form the structure of fluorescence easy.
playing, with irradiation intensity is much smaller than the record, the red laser. so. recording material after absorbing two photons excited to fluoresce. wavelengths of the fluorescence Stokes shift (Stokes shift) deviate significantly from 323nm, green corresponds to 510nm ~ 515nm peak. and then by detecting the fluorescence signal strength to read.
reason why we two-photon absorption can be achieved by recording and playback, because the use of computer simulation re-designed with the best absorption and fluorescence wavelength range of molecules. Specifically, successfully avoided the molecules to fluoresce in the wavelength range of UV absorption wavelength and the media the scope and overlap of red laser wavelengths. When the wavelength near the absorption range of fluorescence, the fluorescence will be absorbed by the media, which can not read the fluorescence. On the contrary, close to the red laser emission wavelength, the diffuse reflection of the red laser will become a player signal noise.
cooperation with MemoryTech development is how the division of labor?
Katsuura: with MemoryTech formed a strategic partnership is in 3 years ago. Our CD technology targeted at civilian products, MemoryTech to us made to facilitate lower manufacturing costs of optical disc manufacturing method. cooperation is the outcome of the trial CD.
MemoryTech proposal is the same DVD, using the two 0.6mm thick base plate bonded together the way. floor sticky joint approach with the disc occurs due to the deformation temperature lower, you can shorten the manufacturing cycle to reduce manufacturing costs and so on. the difficulty of manufacturing technology than HD DVD-ROM lower. can fairly with the cost of basic DVD manufacturing.
the development of our company will be able to produce records of material is two-photon absorption lines of molecular and isobutylene polymer side chain generated a combination of materials. The substance can be caused directly by injection molding mechanism of 0.6mm of the floor. on the water and chemicals substances have a strong defense capability. Information can be stored at room temperature for 200 years.
the trial the disc is 0.6mm to the floor as a recording material, and the other a 0.6mm base plate formed with a polycarbonate and then bonded together from. to use the CD-ROM, a total of 108 layers in written information. When the first trial reached only 106 layers, 108 layers, as the Japanese hope to achieve. so requests each other, ;, and ultimately to achieve this goal.
in the two-photon absorption technique, due to the formation of the recording layer does not shore (Land) and groove (Groove), very difficult to seek servo and focus servo. The technology is how to overcome this difficulty the?
Katsuura: Our recording and playback device, in addition to recording and playback with the red laser, but seek to achieve servo also used infrared laser. recorded servo signal seeking to set the adhesive layer part, that is 0.6mm from the surface of the disc at the counting. Both the laser optical axis coincides, shot from an objective lens.
on the vertical direction (depth) of the focus servo, through the integration of existing and new development technology. Because we signed a joint venture with a confidentiality agreement (NDA), can not be published in this detailed technical content.
to achieve two-photon absorption recording another difficulty lies in the laser output power. previous study, the sensitive recording material is too low, if not made of the laser pulse shape to enhance the output power, then it is difficult to achieve record.
Alpert: using the femtosecond laser pulse output device, as the technology is not enough for the reality of civilian products . The aim of this trial of the device can be customized using a special solid and stable laser oscillation.
Katsuura: We consider the use of semiconductor laser components to achieve the two-photon absorption is very possible. However, this may need to develop than the current red laser DVD recording higher laser output power.
collected from: 365 kiosks
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