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    Fluorescent multilayer disc (FMD) is an optical disc that uses fluorescent material rather than reflective material to store data. It allows for increased storage capacity by using multiple fluorescent information layers that do not interfere with each other. FMD uses photochromism where laser light causes fluorescent material to emit light, which is detected to read stored data. This technology is claimed to provide terabytes of storage using blue lasers to read multiple small fluorescent tracks without interference between layers.

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    Fluorescent multilayer disc (FMD) is an optical disc that uses fluorescent material rather than reflective material to store data. It allows for increased storage capacity by using multiple fluorescent information layers that do not interfere with each other. FMD uses photochromism where laser light causes fluorescent material to emit light, which is detected to read stored data. This technology is claimed to provide terabytes of storage using blue lasers to read multiple small fluorescent tracks without interference between layers.

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    Fluorescent multilayer disc (FMD) is an optical disc that uses fluorescent material rather than reflective material to store data. It allows for increased storage capacity by using multiple fluorescent information layers that do not interfere with each other. FMD uses photochromism where laser light causes fluorescent material to emit light, which is detected to read stored data. This technology is claimed to provide terabytes of storage using blue lasers to read multiple small fluorescent tracks without interference between layers.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    5K views18 pages

    of Seminar

    Uploaded by

    htrahddis
    Fluorescent multilayer disc (FMD) is an optical disc that uses fluorescent material rather than reflective material to store data. It allows for increased storage capacity by using multiple fluorescent information layers that do not interfere with each other. FMD uses photochromism where laser light causes fluorescent material to emit light, which is detected to read stored data. This technology is claimed to provide terabytes of storage using blue lasers to read multiple small fluorescent tracks without interference between layers.

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    of 18

    FLUROSCENT MULTILAYER

    DISC

    BY
    SIDDHARTH
    SHANBHAG
    FLUORESCENT
    MULTILAYER DISC
    What is FMD?
    Fluorescent Multilayer disc is an optical
    disc that uses fluorescent rather than
    reflective material to store data.

    It is an three dimensional storage disc


    developed by Constellation 3D.
    Why FMD?

    • Increased disc Capacity.


    • Quick parallel access and retrieval
    information.
    • Media tolerances.
    • Usage Flexibility.
    Operating Principle:
    • The principle operation of FMD is based on a
    phenomenon of photochromism.

    • The laser beam when focused on the information


    material the material starts radiating than reflecting.

    • The laser beam causes the photochrome material


    to posses the fluorescent properties .

    • The fluorescence is caught up by a device called


    photo receiver.
    • The usage of photochrome material with increasing
    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 density up to Terabytes on the disc.

    • This technology prevents the problem of interference


    since we are using photochrome material which posses
    the fluorescent properties.
    Model of FMD:
    Comparison of Disc Layers:
    Technological Process:
    • Hot Stamping:The layer is pressed with polycarbonate
    and stamped twice with hot temperature. This results
    in two information layer with pits on each side and filled
    with fluorescent material.

    • Photoploymerisation:This process is carried out in


    order to prevent a physical contact with information
    layer on the edge of the disc this is filled with polymeric
    material.
    Advantages of FMD:
    • Prevents problem of interference since it uses an
    incoherent fluorescent light.
    • Compatible with CD and DVD formats with more
    storage area and faster access.
    • Fluorescent technology do not require special
    manufacturing conditions.
    • The technological advantages.
    Applications:
    • Data warehouses.
    • E-commerce related data mining.
    • HDTV.
    • Mobile phones and PDA.
    • PVR
    CD vs DVD vs FMD:
    PARAMETERS CD DVD FMD

    1. Disc 120mm 120mm 120mm


    diameter
    2. Capacity 750MB 4GB 50GB+
    3. Wavelength 780nm 650nm 480-
    530nm
    4. Distance b/w 1.6micron 0.85micron 0.80micro
    tracks n
    5.No.of layers 1 2 12
    Conclusion:
    The rapid technological development that is taking
    place in storage devices has also made the man think
    about the needs and the requirements for the storage
    devices.
    But for now the FMD, which can provide us with
    gigabytes(GB) of storage space compared to CD and
    DVD seems to be an enticing solution for the storage
    masses.
    References:
    • www.en.wikipedia.org/wiki.
    • www.ixbtlabs.com/articles .
    • www.seminartopic.org.
    • www.ebook-search-
    engine.com/fluroscent-multilayer-
    disc.
    What’s Next?
    • About the company.
    • Working.
    • Types.
    • Development.
    • Disadvantages.

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