Eosin Y/triethanolamine dispersed poly (hydroxyethyl methacrylatecomethyl methacrylate) photopolymer
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Eosin Y/triethanolamine dispersed poly (hydroxyethyl methacrylatecomethyl methacrylate) photopolymer
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Eosin Y/triethanolamine dispersed poly (hydroxyethyl methacrylatecomethyl methacrylate) photopolymer

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20

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61

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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor. 
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2012

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English

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00:03
good morning everybody In this presentation I will talk about our investigations of problem on the materials for datastorage recording and I think this may be a bit a bit away from the interest of what is spread all over so in the following presentation I will try my best to explain what I'm saying and this and that and that's right the cue for my talk shot my so in
00:38
the 1st I would like to introduce the forum horrible and recording materials and then over describes the PQ memory which is the photopolymer recording material with very negative especially kitchen and then I will introduce you t a poorie MMSE call that's the which some cold start for the warning with improved sensitivity and the design and fabrication and graphic characterization of the these materials will be described and finally some conclusions from me and
01:20
this shows that certain systematic diagram of foreign direct data storage the special right the moderator brings in the object of the game and the reference beam brings in the period page trees and that information recorded in this forum so these type of flow data storage interesting because the boring datastorage controlled by provide In the story density higher than 100 bits for micro meters squared which is equivalent to a 300 to go by the disk is about 60 times logic of off the current DVDs and it can provide carried out 0 for the of date of the recording and read out the rate and although philology got into the 2nd which is about some 100 times as fast as of this current DVT speed In addition it has a 3 dimensional grid structure and which can provide some niche applications the key challenges that we need to have a sick recording material with a good optical and orographic property what is so what are the
02:51
material parameters are required for negative counselors it depends on the system specifications for example if we require the data or recording and readout speed of for 1 to govern the per 2nd and that storage this for 300 to go by to produce and if we use a special that the moderator of 1 megabit of pixels and with that is a part of 20 million and the recording area all for finding meters squared and with a CCD detector sensitivity of what southern Nigeria Unitrans but pixels that we we can take it at that time the estimate that exploit the energy per photon is about 2 . you're permitted centimeters square and that directly chain efficiency of each program to be larger than 10 1 1 . 6 times 10 to minus 4 and based on this and digits we can estimate the material parameters that sensitivity is required to be about 6 31 . 6 centimeters square producer and the dynamic range of the material or the any number is about 6 . 3 2 under currently
04:09
there are different kinds of recall recording materials for these investigations including for the 20 most photorefractive crystals in our case we are interested in the top part this which is P Q P and and shown in the right corner and the goal is to make gun sick recording media but the challenges that material sinkage so how sensitive is the think problem this can be
04:38
estimated by using a numerical simulation so that the optic assistant here shows Fourier program of data storage and of the of the recording medium is 5 needed to seek recording media and the the table on the right shows the sink coefficient of the material on the reconstructed image and it can be seen that if the percentage coefficient is larger than the 5 10 times 10 to the minus 5 then the reconstructed image is degraded and the distorted and if we want to have a good reconstruction from the finding the meter thick medium then this shrinkage coefficients should be less than 10 to minus 5 so how to make this material with such a small drink it's your
05:33
coefficients In our strategy for obtaining Dawson keys for the material for the materials that we make as strong matrix and then we football sensitizer monetarists uniformly distributed in the material so in the fabrication procedure we have the following initiator process that some monomer and there we have photosensitizer monitors to a combined mixed in the solution and no with similar parameters at polymerization procedure we form the forum memetics and we see a sort descent and therefore the horrible recording the illumination of ticket emission induced photochemical reaction between the photosensitizer money to an end then the residue of 1 monitors and to form a reflected in descriptive in that way we have recalled the horror so all components
06:35
of the material is is a photosensitizer as a which is a PQ and within 1 among which is a memory and we have someone initiated the idea of
06:47
and for the product replication process you're this 3 components are mixed to form a solution and then after the stirring and filtering and everything to step from all modernization then a sort of a simple can be for this
07:05
what there are different geometries of the fault samples materials can be formed as a this or block structure so now we want to
07:17
estimate experimentally how is this shrinkage effect of this material so we said a 90 degree as an instructor according structure and that we have recorded the 200 and 54 runs with anger multiplexing technique to recall the programs in the 1 spot all the 5 I mean 5 mm thick material and these
07:42
shows the the the the the different of the image is the origin and and the rest of them are the reconstructed image from this to 150 programs and can be seen that the they have good construction if we met in the 9 scanning of the
08:02
reconstructed images and compare that with the original image and you could see that the 2 would I scanning the curves of quite identical and these uh we have would construct reconstruction from this finding meter thick material and the question is that ommatidia use was varied also inked coefficients may be based spend 10 to minus a fight with all of this is good as suitable for recording bottom horror and then the whole good is the material for recording the data storage so we have to make
08:39
accurate characterization of the Apollo graphical parameters to estimate the dynamic range and explore the sensitivity the dynamic range is redirected to the stores that starts densities and exploiting succeeded activities related to the right to speak of the material so again the systematic practice of recording the structure and that we 175
09:08
programs at 1 single spot and then the major we measure the cumulative greatest strengths of its recording as it is in product as a function of exposure and was the courage and we can have a of 10 and the M a number of the material and the sensitivity of the material was use of 4 . 2 and sensitivities of point 0 9 5 centimeters at you and based on these we could estimate that this material can support this happens at the office 64 bits per micro square issues is equivalent to at 200 took about disk and that that he could support the band power right so a 30 minute maybe megabits per 2nd of course this is still far away from our goal of goal is to achieve 300 to go back to disk and to achieve that I really want to government per 2nd so still we need to have a material improvement before that I'd like to show you some demonstration of the moral right that that stories
10:23
using or P Q P M and the disk that this is a classic thickness is too many major and the diamond is 5 inch and other information recorded in the refraction horrible reflection holograms structure as that that operator picture shows the system and this is
10:49
the holographic memory reconstruction the other image is or isn't in which which use a 100 and 20 to go by the fire and they are divided into 57 pages or for break up and the white man pages it's a pretty 130 by 130 beats per page and these 50 pages of in what information recorded in the optic disk and then we reconstructed from the disk and combined to form the decoded image which is shown in the upper and lower in the image of and this recording the writing process we could extend it we could estimate the bit rate of this process and the number of bit error rate is 1 point 8 times 10 to minus 3 what so this shows that our material is a good for what they tell stories about as we mentioned we still have to improve the material sensitivity and dynamic range so that we have
12:06
to consider the physical mechanism of recorded in this material our analysis shows that the that the holographic recording in this material is achieved by the for the chemical reaction the PQ molecule communication with and monetary unit 1 molecule to onetoone Monica combination process and so the speed of light for robotic recording is dependent on the speed of generation of PQ replicas and as we
12:43
know other the speed of generation that of all the PQ radicals for the for the reaction of the queen among accuracy is relatively so and on the other hand we know that the the for the reaction of a by a monarch PureSystems of the ocean y a is quite fast which means that if we repress the PQ monarchist by this my monitor system we might achieve that foster recording speed and that can increase improve the sensitivity of material so this shows the
13:21
components of for new for deployment of the Federal societies and my manicurist system of word use in wine energy and we have monomer and and similar initiative and it with the same
13:34
fabrication process we
13:38
think we kept some and then and then we we experiment and
13:46
again to measure the erotic multiple recording characteristics of this material and then from the experimental results we see that OK this circuit so that the from the table we can see the comparison of the PQ PMMA and we the news fault appointments and we see here we only mn number of 1st and then the sensitivity Sensitivity here from the material it would so sensitivity of the material for the origin of piece PMMA is a point of 1 and for the new for the autumn anterior 2 . 4 1 which means this material can support of that they are writing speed of 16 megabits per 2nd which is about 5 times as the previous 1 and but on the other hand the and the number is reduced by half and this that the stories stays the of this is about the less than half of the stories in the about 50 19 to go back the disk means we still need to make investigation or optimization optimization of the of the components or all of the concentrations of all of these components and 4 here so
15:25
I to give some summary we have found that rickety this full deployment materials which is good for data storage applications and then we the best on the physical mechanism of the recording process we we are trying to optimize or to improve the sensitivity and dynamic range of the material and the and optimization is useful for further improvement is ongoing and we hope that in the future we also could find applications of these materials for disparate tolerance think you were few thank you my wife there were again this is the that this somehow they present resolution decrease of the you
16:34
know this and that and the storage capacity is predicted for the dynamic range or the or the the modulation of the refractive index and when we change the composition or the concentration the the the amount of the photochemical reaction the amount of the for the configuration of the system may be change so we we have to make a lot of love for the measurement to to see what is going on yeah herbicides in both cases and in all but we have learned that make holograms with different intersection angles yet and so that is equivalent to special frequency response the moon most materials can all for quite a wide range all 4 of within awful recording and with the same of the same year diffraction efficiency is is about the sum of audio we have made 10 voltage here from 10 to 40 degrees or so 22 48 80 degrees written so quite similar in the in the spatial frequency response of the yeah but you know that occurred spatial frequency responses and that in gas storage gigabytes per day as yet you know what you here you
18:20
know this is just 1 1 components 1 1 that was once concentrations of the components so I think of this still need to be optimized because different concentrations would produce different amounts of full football chemical reaction and of course the scattering for scatter noise some of the kind of still has to be a major major tool to identify the real consequently and to what was going on yeah you should you therapy