Methods for storing holographic data and articles having enhanced data storage lifetime derived therefrom
A data and holographic technology, applied in the field of holographic data storage media and products, can solve the problem of erasing written information
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0119] All treatments of the compounds were performed in the dark or under red light conditions.
[0120] 2 g of optical quality PMMA (poly(methyl methacrylate)) were dissolved in 10 ml of dichloromethane. Put 2ml of this solution into a brown vial, add and dissolve 3mg of a singlet oxygen sensitizer with the general structural formula shown in (X)——ZnNa(2,11,20,29-tetra-tert-butyl-2 , 3-naphthocyanine zinc, CAS No.39049-43-9, Aldrich Chemical Co.). Finally, add and dissolve 2 mg of DAEOH having general structural formula (VI) 0 (1,2-bis[5'-(4"-hydroxyphenyl)-2'-methylthiophen-3'-yl]perfluorocyclopentene). The mixture was then solvent cast on a glass slide, A film about 100 microns thick was thus formed and dried under slight vacuum for 24 hours.
[0121]
[0122] A plane wave hologram was written into the dry film using a 405 nm setting with a diffraction efficiency of 1%. A plane wave hologram is a recorded interference pattern formed by a signal beam and a reference ...
Embodiment 2
[0124] The same film samples were prepared as described in Example 1 above, and a hologram was written at 405 nm in the same manner as previously described. The written data was exposed to an unfocused laser beam of 780 nm (a laser beam of 100 mW irradiated on an area of 5 mm containing the hologram of the medium written at 405 nm) for 1 hour under an oxygen atmosphere. Next, the attenuation of the hologram was monitored using a 405 nm readout laser beam. The readout laser beam is focused on the hologram and the diffraction efficiency is monitored. The diffraction efficiency at t1 is higher than the reference diffraction efficiency.
Embodiment 3
[0126] Preparation of Diarylethene (1,2-bis[5′-(4″-hydroxyphenyl)-2′-methylthiophen-3′-yl]-perfluorocyclopentene, DAEOH 0 , general structural formula (VI)) in acetonitrile solution (sample A). Figure 5 Absorbance (Y-axis 68 ) is shown as a function of wavelength (X-axis 70 ) before and after exposure to 405 nm bleaching radiation. The absorption spectrum 72 was measured prior to exposure to bleaching radiation. Sample A was then subjected to bleaching radiation at a wavelength of 405 nm for 9 minutes. A spectrum 74 of absorbance versus wavelength is then measured. Spectrum 74 shows a distinct peak at about 600 nm, which was not observed in absorbance spectrum 72 prior to bleach exposure, indicating photoproduct generation by bleach exposure. While the applicants do not wish to be bound by any particular theory, it is believed that upon exposure to 405 nm bleaching radiation, the open diarylethene (DAEOH 0 ) undergoes a cyclization reaction to form a closed diarylethene (...
PUM
| Property | Measurement | Unit |
|---|---|---|
| wavelength | aaaaa | aaaaa |
| glass transition temperature | aaaaa | aaaaa |
| glass transition temperature | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More