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FLUOROSCENTFLUOROSCENT
MULTILAYER DISCMULTILAYER DISC
Fahad T HFahad T HBSc.ECH, S6,BSc.ECH, S6,
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FLUORESCENT MULTILAYER DISC (FMDFLUORESCENT MULTILAYER DISC (FMD
FMDs are a new technology being developedby Constellation 3D Inc.
Implement the concept of volumetricstorage of information.
It is an optical data storage formatsimilar in size and appearance toregular CD-ROMs and DVDs.
FMD is a readable and re-writable disc.
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Max data transfer rates are approximately 1GB/sec.
FMD is a transparent disc, consisting
multiple data layersData is recorded on multiple layers
inside a disc.
Capacity of each data layer is 4.7GB.
Each data layer consists of pits &
groves.
Pits are embedded with transparent
fluorescent material.
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TECHNOLOGICAL OVERVIEW OF FMD TECHNOLOGICAL OVERVIEW OF FMD
FMD is a transparent disc.
No reflective layer like CD/DVD.
Technology in CD:
Beam of laser hits on data layer
It reflects from aluminum data
layer
Fixed with a detector-receiver
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Technology in FMD:
No reflected laser beam.
Principle of operation based on aphenomenon photochromism .
An organic material called stable
photochrome is used asfluorescent material.
Photochrome initially doesn't
possess fluorescent properties.
It when acted upon by
laser beam starts photo chemical
reactions & obtain the fluorescent
properties.
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OPERATING PRINCIPLE OPERATING PRINCIPLE Laser beam strikes thefluoroscent material
Incoherent Light emitted
Emission of data stored inincoherent light.
Incoherent light passes through adjacentdata layers without getting distorted.
Filtration of emitted light before itreaches the drive's detector
Only the data-carrying fluorescentlight passes after filtration. This fluorescence light is caught up
by the photo receiver.
and assigns a value 1.
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TECHNOLOGICAL PROCESS TECHNOLOGICAL PROCESSOF MANUFACTURE OF MANUFACTURE
Two types of technological processfor FMD manufacture .
Hot StampingPhoto PolymerizationHot StampingHot Stamping
Pressing of polycarbon sheets with two stamps at high temperature.
Formation of a layer with twoinformation sides.
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Filling pits with fluorescent material.Pressing of informational layers when material gets hard.
Photo PolymerizationPhoto PolymerizationFor production of multiple disc by stacking of discs one after
other.Manufacture of thin plastic film for informational layer.
Plastic film is of 25-30 micron width.Film is stamped & then installed on external surface of anickel matrix that carry negative copy of produced informationlayer.
Pits are filled with fluoroscent material and finally covered with protective layer.
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FMD RECORDINGFMD RECORDING
Technology used: WORM (Write OnceRead Many)
A series of rewritable discs called FMD WORM
Two rules to be followed while recording : The write laser should able to turn the fluorescence on oroff.
Threshold power of laser for recording & less power forreading .
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RECORDING TECHINQUESRECORDING TECHINQUESThermal :U sage of materials that possesses fluorescent properties
from beginning. When recording the segments, which are thermally acted
upon with laser, the fluorescent properties are lost.
Chemical :U sage of a material that doesn't possess fluorescent
properties form the beginning. When acting upon with a laser a photochemical reaction starts,and the material gets fluorescent properties
A low power laser is enough, or even a usual LED
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SOME IMPORTANT POINTSSOME IMPORTANT POINTS The usage of photochrome material increases the
number of information layers do not make the signal worse which is not in case of other optical discs.
The developers state that with blue laser(480nm) it is possible to increase capacity to Terabytes on the disc.
This technology prevents the problem of interferencesince we are using photochrome material which posses the
fluorescent properties.
Drives for FMD can easily understand CD/DVD.
FMD drives are similar to CD/DVD.
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ADVANTAGES OF FMD ADVANTAGES OF FMD
Increased disc capacityQuick parallel access and retrieval of informationMedia tolerances & U sage flexibility
Optically transparent and homogeneous multilayer systemEmission of incoherent light eliminates interference.Compatible with present CD/DVD formats & ability to
withstand more extreme conditions
U nique dye chemistry of FMD offers an extraordinary amountof security.Cost of production of FMD discs is relatively cheap.
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COMPARISON OF CD,DVD,FMDCOMPARISON OF CD,DVD,FMD
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APPLICATIONS APPLICATIONS
Storage of a very high detailedarchive of maps.
Ability to store a large amountof files in uncompressed format.
Ability to store the whole of a series of TV programme
(eg, 20 episodes,each an hour long).Digital cinema, HDTV players.Internet content streaming and
data backup storage.
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CONCLUSION CONCLUSION
The FMD Digital Cinema disc has the potential toprovide a secure, removable, single disc distributionmethod.
The FMD can provide us with a staggering 140 GB of storage space seems to be an enticing solution for thestorage - hungry masses.
Mans need for additional storage space is increasing
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REFERENCESREFERENCES
www.en.wikipedia.org/wiki. www.ixbtlabs.com/articles .
www.seminartopic.org. www.ebook-search-engine.com/fluroscent-
multilayer-disc .
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THANKYOU!..