CN101763868A - Use and structure of bisazo benzene polymer as two-photon optical storage medium - Google Patents
Use and structure of bisazo benzene polymer as two-photon optical storage medium Download PDFInfo
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- CN101763868A CN101763868A CN200910251404A CN200910251404A CN101763868A CN 101763868 A CN101763868 A CN 101763868A CN 200910251404 A CN200910251404 A CN 200910251404A CN 200910251404 A CN200910251404 A CN 200910251404A CN 101763868 A CN101763868 A CN 101763868A
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Abstract
The invention relates to an erasable two-photon polarized multivariate, multistage and multilayer optical storage technology based on a bisazo benzene polymer. The prepared bisazo benzene polymer is used as the two-photon optical storage medium. Linearly polarized titanium: sapphire laser (wavelength: 800mm, pulse cycle: 80fs and repetition frequency: 80MHz) two photons are used to write data and a reflective confocal laser scanning microscopy is used to read the data. When the bisazo benzene polymer is used for two-photon storage, if light polarization direction is read that the light polarization direction is changed from the direction in parallel with writing light to the direction forming an angle of 45 degrees with the writing light and then to the direction perpendicular to the writing light, the data undergoes a change from 'dark spot' to 'disappearance' and then to 'bright spot'. Based on the characteristic, polarized multivariate and multistage optical storage can be realized. The written data is erasable. Data can be rewritten after being erased. A composite multilayer film which takes a bisazo benzene polymer layer as a storage layer and takes a polyvinyl alcohol (PVA) layer as a spacing layer is prepared, so multilayer storage can be realized on the basis of polarized multivariate and multistage optical storage. Thereby, a new way is provided for the realization of high-density optical storage.
Description
Technical field
The present invention relates to the double-photon optical technical field of memory, specifically is a kind of two-photon wiped polarized multivariate based on the bisazo benzene polymer storage medium, multistage, multi-layered high-density optical storage technology.
Background technology
At present, the Subjective and Objective polymkeric substance of doping azo dyes has been widely used in the research of double-photon optical storage aspect.2004, U.S.'s " applied physics wall bulletin " (Applied Physics Letters, 2004 85 volume 351-353) has reported and use the 800nm titanium in polymethylmethacrylate (PMMA) film of doping Red-1 200 (DR1): the sapphire femtosecond laser carries out the storage of two-photon polarization.Because DR1 in the two-photon excitation process bleaching taken place, so this is an irreversible process, that is to say that the two-photon storage of this material can not be wiped, and is difficult to realize polynary and multistage storage.2007, U.S.'s " optics letter " (Optics Letters, 2007 32 volume 277-279) reported and mixing 2, excited with the 780nm Fs laser double photon in polystyrene (PS) film of 5-dimethyl-4-(p-nitrophenyl azo) methyl phenyl ethers anisole (DMNPAA) and realized that erasable polarized multivariate, multilayer store.The Subjective and Objective polymkeric substance of doping azo dyes has following two common shortcomings: one, the concentration of azo dyes can not be mixed De Taigao, otherwise assembles easily.Its two, the two photon absorption cross section of azo dyes is little, optical anisotropy (birefringence) is also little, thereby it is undesirable to cause it to be used for two-photon storage effect, and is difficult to realize simultaneously polynary and multistage storage, thereby limit the raising of storage density.
Adopting the multilayer storage to improve storage density is a focus of studying for many years.1998, U.S.'s " optics letter " (Optics Letters, 1998 23 volume 1781-1783) reported that at a kind of polyurethane-urea multipolymer that contains azo chromophore with side chain be accumulation layer, be in the wall three-decker film with polyvinyl alcohol (PVA) (PVA), argon laser with 488nm writes light source as single photon, has realized two-layer storage.2004, U.S.'s " applied physics wall bulletin " (Applied Physics Letters, 2004 85 volume 176-178) reported with the multilayer film of above same composition and structure in, shape by inscribing 3-D nano, structure control store point in storage medium and spatial frequency distribution and then carry out the optical storage of two-photon multi-layered high-density, storage density can reach 2.0Tbits/cm
3
The present invention with bisazo benzene polymer as the two-photon storage medium, employing is similar to the used film-forming method of above report and prepares the sandwich construction membrane sample, the method that adopts two-photon to write, not only can obtain better to store effect, and can realize erasable polarized multivariate, multistage, multilayer storage simultaneously, thereby be expected to obtain higher storage density.
Summary of the invention
In order to overcome easy the gathering and the unfavorable deficiency of storage effect of Subjective and Objective polymkeric substance azo dyes that tradition is used for the doping azo dyes of two-photon storage, and further improve storage density, the invention provides bisazo benzene polymer as two-photon optical storage medium purposes and structure, it not only can suppress the gathering of azo chromophore, and has a better two-photon storage effect (higher signal contrast, better read effect, bigger storage stability), and can realize polynary simultaneously, multistage, the multilayer storage is opened up a new route for realizing the high density storage.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of bisazo benzene polymer is characterized in that as the two-photon optical storage medium purposes: molecular structure be the bisazo benzene polymer of following formula as the two-photon optical storage medium material:
R
1＝CH
3，CH
2CH
2OH R
2＝CN，NO
2 x＝2，6。
Described bisazo benzene polymer is as the two-photon optical storage medium purposes, it is characterized in that: described bisazo benzene polymer adopts the titanium of linear polarization when the two-photon optical storage medium: sapphire laser focuses on the two-photon optical storage medium layer and writes data as writing light inlet; The data that write can by will wipe light (for titanium: sapphire laser) the furnishing rotatory polarization or with its change of polarized direction to wiping perpendicular to writing the light polarization direction scan storage areas, can write again after wiping.
Described bisazo benzene polymer is characterized in that as the two-photon optical storage medium purposes: when described bisazo benzene polymer is used as two-photon optical storage medium, adopt the titanium of linear polarization: sapphire laser writes data as writing light inlet; Adopting the polarization direction angle is that 45 ° two bundles are write light inlet when the optical storage media of same storage area writes data respectively, can realize binary storage, and promptly two bundles are write two kinds of different pieces of informations that light inlet writes and deposited in simultaneously in the optical storage media of same area; When reading the data that write optical storage media, adopt and read the light reading of data, read light and also be the titanium of linear polarization: sapphire laser; Adopt with write light polarization direction parallel or vertical read the light reading of data time, can obtain the data-signal that writes of high-contrast; When reading light polarization direction and writing light polarization direction when at 45, can not read and write data-signal, could successfully carry out reading of binary storage data based on this character, guarantee that two kinds of data-signals read Shi Buhui and crosstalk; When reading light polarization direction and writing light polarization direction and become other angle, also can read and write data-signal.
Described bisazo benzene polymer is as the two-photon optical storage medium purposes, it is characterized in that: when described bisazo benzene polymer is used as two-photon optical storage medium, the intensity of reading that writes data is cyclical variation with reading light polarization direction, be parallel to when writing light polarization direction when reading light polarization direction, the data-signal of reading that writes is " dim spot "; When reading light polarization direction when writing light polarization direction, the data-signal of reading that writes is " bright spot "; The described bisazo benzene polymer that this character makes can be used for multistage storage.
A kind of bisazo benzene polymer is as the structure of two-photon optical storage medium, it is characterized in that utilizing polyvinyl alcohol (PVA) as wall, adopt bisazo benzene polymer as light medium memory layer, be prepared into the composite multilayer membrane that polyvinyl alcohol (PVA) and bisazo benzene polymer replace, can realize the multilayer storage.
With the Subjective and Objective polymer phase ratio of common doping azo dyes, the present invention can obtain higher concentration and can not assemble, and has bigger two photon absorption cross section and optical anisotropy.
Because the common azo dyes of bisazo benzene molecular proportion of two ends band push-and-pull electron group has bigger two photon absorption cross section, bigger birefringence, therefore a kind of bisazo benzene monomer of two ends band push-and-pull electron group and methyl methacrylate (MMA) or hydroxyethyl methylacrylate (HEMA) copolymerization are obtained bisazo benzene polymer, can obtain the doping content higher, bigger optical anisotropy, so just lay the foundation for obtaining better two-photon storage effect than the Subjective and Objective polymkeric substance of common doping azo dyes.But because this bisazo benzene polymer film forming character is relatively poor, be difficult to obtain thick and uniform film, this is unfavorable to realizing the multilayer storage.For addressing this problem, the present invention adopts the alternately method of film forming, and preparing a kind of is that accumulation layer, polyvinyl alcohol (PVA) (PVA) are the composite multilayer membrane of wall with the bisazo benzene polymer.Titanium with linear polarization: (repetition frequency: 80MHz) two-photon writes data to sapphire laser for wavelength: 800nm, recurrence interval: 80fs, with reflection confocal laser scanning microscopy sense data.In the two-photon excitation process, the orientation that caused by the selectivity isomerization can take place in the bisazo benzene chromophore, thereby produces anisotropy.This is a reversible process, and therefore the storage of the two-photon of this material is erasable.This material also has an outstanding feature as the two-photon storage, that ought be read light polarization direction exactly and write light inlet to change to and write light inlet at 45 again to perpendicular to writing light inlet from being parallel to, and the data read output signal can take place by " dim spot " to " disappearance " again to the variation of " bright spot ".Therefore write layer at each and can carry out polarized multivariate, multistage storage.In addition, because the advantage of two-photon technology itself, promptly the light source penetration power is good, and has superior spatial resolution and spatial selectivity, so the multilayer storage also is easier to realize.
The invention has the beneficial effects as follows, when can suppress the azo chromophore gathering, can obtain the effect of two-photon storage preferably, and can realize erasable polarized multivariate, multistage, plurality of layers of double photon optical storage simultaneously, thereby can realize the high density storage.
Description of drawings
Fig. 1 is the synthetic reaction equation of bisazo benzene polymer of the present invention.
Fig. 2 is multilayer film structures of samples figure of the present invention.
Fig. 3 is the installation drawing that bisazo benzene polymer of the present invention is applied to the double-photon optical storage.
Embodiment
In Fig. 1, by end have strong electron-withdrawing group group (nitro or cyano group), bisdiazo monomer with two or six spacer mixes with certain mol proportion with refining methyl methacrylate (MMA) or hydroxyethyl methylacrylate (HEMA), tetrahydrofuran with new steaming is made solvent, AIBN makes initiating agent, tube sealing, under the anhydrous and oxygen-free environment, 65 ℃ were reacted three days, and promptly obtained bisazo benzene polymer.It is existing than mature technology that present technique belongs to.
The bisazo benzene polymer structural formula is as follows:
R
1＝CH
3，CH
2CH
2OH R
2＝CN，NO
2 x＝2，6
In Fig. 2, before this bisazo benzene polymer was dissolved in pyridine, dispose certain density strong solution, it is dropped on the clean substrate of glass 3 get rid of film with certain rotating speed, drying.Then that polyvinyl alcohol (PVA) (PVA) is soluble in water, prepare certain density solution, it is dropped in film on the substrate of glass of having got rid of one deck bisazo benzene polymer or get rid of film with certain rotating speed, drying.And the like, replace film forming with above two kinds of solution, promptly obtain with polyvinyl alcohol (PVA) 2 as wall, bisazo benzene polymer 1 sandwich construction membrane sample 13 as accumulation layer.
In Fig. 3, the used two-photon memory storage of the present invention mainly is with titanium: sapphire femtosecond laser (wavelength: 800nm, pulse width: 80fs, repetition frequency: 80MHz) 4 expand acquisitions linearly polarized photon conduct such as beam tube 8 and write light inlet by optical gate 5, energy attenuator 6, the polarizer 7, light, it is vertical with the light media plane generally speaking to write light inlet, be incorporated into confocal laser scanning microscopy then (by the 9-PZT scan table, the 10-object lens, 11-dichronic mirror, compositions such as 12-photomultiplier) and then focus on the respective stored layer of membrane sample 13.
Titanium: the polarization direction of sapphire laser 4 is not fixed, can change by the polarizer, want to read which type of signal and just change to corresponding polarization direction, just change such as the signal of wanting to read " bright spot " and read light polarization direction to write light polarization direction vertical.
Embodiment 1: wipe experiment
The orientation that caused by the selectivity isomerization takes place in the bisazo benzene chromophore in the two-photon ablation process, thereby produces anisotropy.This is a reversible process, therefore the storage of the two-photon of this material can be by with titanium: sapphire femtosecond laser 4 furnishing rotatory polarizations or its polarization direction changed to perpendicular to the storage area that writes photoscanning membrane sample 13 to upset original orientation by the polarizer 7, wipe.Can also write again after wiping.
Embodiment 2: the polarized multivariate storage
Bisazo benzene polymer is as the two-photon storage medium, is parallel to and writes light inlet or perpendicular to writing the light time, can obtain the signal of high-contrast when reading light polarization direction; When reading light polarization direction and writing light inlet when at 45, can not read output signal.Based on this characteristic, can be 45 ° two bundle titaniums with the polarization direction angle: sapphire femtosecond laser 4 writes two kinds of different pieces of informations (such as two letters) at the storage medium of same area, read with the light of corresponding polarization direction respectively then, can realize binary storage, two kinds of read output signals can not crosstalked.
Embodiment 3: multistage storage
When bisazo benzene polymer was stored as two-photon, data were read intensity and are cyclical variation with reading light polarization direction.Be parallel to when writing light polarization direction when reading light polarization direction, data are " dim spot "; When reading light polarization direction when writing light polarization direction, data are " bright spot ".Based on this characteristic, can use the different several bundles in polarization direction with one deck zones of different (such as 0 °, 90 °) titanium: sapphire femtosecond laser 4 writes data, use same polarization direction (such as 0 ° then, 90 °) light read these data, the data of reading will present the phenomenon of bright-dark degree's difference (existing " bright spot " has " dim spot " again), can realize multistage storage.
" dim spot " is to write light inlet and to read the polarisation of light direction parallel, and " bright spot " writes light inlet and to read the polarisation of light direction vertical.
Embodiment 4: the multilayer storage
Move at vertical direction by PZT scan table 9,, just can carry out spatial multi and store the light medium memory layer of light-resource fousing to corresponding membrane sample 13.Add each layer and can carry out polynary, multistage storage, and then just can realize the high density storage.
Claims (5)
1. a bisazo benzene polymer is characterized in that as the two-photon optical storage medium purposes: molecular structure be the bisazo benzene polymer of following formula as the two-photon optical storage medium material:
R
1＝CH
3，CH
2CH
2OH R
2＝CN，NO
2 x＝2，6
2. bisazo benzene polymer according to claim 1 is as the two-photon optical storage medium purposes, it is characterized in that: described bisazo benzene polymer adopts the titanium of linear polarization when the two-photon optical storage medium: sapphire laser focuses on the two-photon optical storage medium layer and writes data as writing light inlet; The data that write can by will wipe light (for titanium: sapphire laser) the furnishing rotatory polarization or with its change of polarized direction to wiping perpendicular to writing the light polarization direction scan storage areas, can write again after wiping.
3. bisazo benzene polymer according to claim 1 is as the two-photon optical storage medium purposes, it is characterized in that: when described bisazo benzene polymer is used as two-photon optical storage medium, adopt the titanium of linear polarization: sapphire laser writes data as writing light inlet; Adopting the polarization direction angle is that 45 ° two bundles are write light inlet when the optical storage media of same storage area writes data respectively, can realize binary storage, and promptly two bundles are write two kinds of different pieces of informations that light inlet writes and deposited in simultaneously in the optical storage media of same area; When reading the data that write optical storage media, adopt and read the light reading of data, read light and also be the titanium of linear polarization: sapphire laser; Adopt with write light polarization direction parallel or vertical read the light reading of data time, can obtain the data-signal that writes of high-contrast; When reading light polarization direction and writing light polarization direction when at 45, can not read and write data-signal, could successfully carry out reading of binary storage data based on this character, guarantee that two kinds of data-signals read Shi Buhui and crosstalk; When reading light polarization direction and writing light polarization direction and become other angle, also can read and write data-signal.
4. bisazo benzene polymer according to claim 1 is as the two-photon optical storage medium purposes, it is characterized in that: when described bisazo benzene polymer is used as two-photon optical storage medium, the intensity of reading that writes data is cyclical variation with reading light polarization direction, be parallel to when writing light polarization direction when reading light polarization direction, the data-signal of reading that writes is " dim spot "; When reading light polarization direction when writing light polarization direction, the data-signal of reading that writes is " bright spot "; The described bisazo benzene polymer that this character makes can be used for multistage storage.
5. a bisazo benzene polymer is as the structure of two-photon optical storage medium, it is characterized in that utilizing polyvinyl alcohol (PVA) as wall, adopt bisazo benzene polymer as light medium memory layer, be prepared into the composite multilayer membrane that bisazo benzene polymer and polyvinyl alcohol (PVA) replace, can realize the multilayer storage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103625153A (en) * | 2012-08-23 | 2014-03-12 | 中国人民银行印制科学技术研究所 | Optical storage anti-fake element, manufacturing method, application and optical elements applied to manufacturing process |
| CN105175971A (en) * | 2015-08-21 | 2015-12-23 | 安徽大学 | Supermolecule bisazobenzene compound and preparation method thereof |
| CN108332690A (en) * | 2018-04-14 | 2018-07-27 | 深圳市富优驰科技有限公司 | A kind of MIM full automatic planars degree detection device |
-
2009
- 2009-12-18 CN CN200910251404A patent/CN101763868A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103625153A (en) * | 2012-08-23 | 2014-03-12 | 中国人民银行印制科学技术研究所 | Optical storage anti-fake element, manufacturing method, application and optical elements applied to manufacturing process |
| CN103625153B (en) * | 2012-08-23 | 2015-09-09 | 中国人民银行印制科学技术研究所 | Optical storage Security element, manufacture method, application and the optical element for the manufacture of process |
| CN105175971A (en) * | 2015-08-21 | 2015-12-23 | 安徽大学 | Supermolecule bisazobenzene compound and preparation method thereof |
| CN108332690A (en) * | 2018-04-14 | 2018-07-27 | 深圳市富优驰科技有限公司 | A kind of MIM full automatic planars degree detection device |
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Open date: 20100630 |