International Symposium on Optical Memory and Optical Data Storage Topical Meeting
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Holographic storage - elegant technology, elusive product
- Trang 138-140
This article gives a review of holographic data storage, and covers such topics
as: history and development; technological issues; recording media; recording
and recreation systems; future outlook and prospects.
#Holography #Photorefractive materials #Optical materials #Optical recording #Optical distortion #Optical modulation #Holographic optical components #Liquid crystal displays #Sensor arrays #Costs
High density recording on a dual layer phase change disk with PRML method
- Trang 4-6
We have previously reported experimental results of a high density recording and
reproducing technology of over 25 GB capacity/side using high NA objective lens,
a thin cover layer, blue laser diode, and partial response maximum likelihood
(PRML) method (S. Furumiya et al, Tech. Digests ODS2001; M. Shoji et al, Tech.
Digest, ISOM2001). However, larger capacity is desired for a digital video
record...
#Disk recording #Jitter #Video recording #Lenses #Diode lasers #Optical recording #Pulse modulation #Optical films #Optical filters #Optical modulation
Gap servo system for a biaxial device using an optical gap signal in a near field readout system
- Trang 287-289
An optical head with a biaxial device is considered to be the most promising
device for a practical optical disc system. However, since it has a long working
range of hundreds of micrometers and high voltage sensitivity, a new technique
is required for applying a gap servo in a near field system. In particular, the
overshoot upon starting a gap servo is a severe problem. An overshoot of less
than ...
#Optical devices #Servomechanisms #Optical sensors #Optical surface waves #Lenses #Servosystems #Tellurium #Digital video broadcasting
Generation of compact near-field energy for optical recording
- Trang 281-283
Techniques that can be used to make sub-wavelength diameter optical spots are
reviewed, as well as their application to optical recording. Advantages and
disadvantages of each technique are listed. Fiber probes, solid immersion
lenses, antennae, and combinations are included.
#Optical recording #Apertures #Probes #Lighting #Transducers #Memory #Lenses #Data engineering #Throughput #Geometrical optics
High density near field readout over 50 GB capacity using a solid immersion lens with high refractive index
- Trang 284-286
We have already reported a high density near field readout system with a GaN
blue laser of 405 nm wavelength and an optical pick-up of an effective numerical
aperture (NA) of 1.4. A readout performance of the near field readout system
depends on the optical parameters, namely the NA of a solid immersion lens (SIL)
and the laser wavelength. With a relative high refractive index glass material,
we c...
#Lenses #Refractive index #Optical refraction #Optical variables control #Glass #Gallium nitride #Apertures #Solid lasers #Optical materials #Optical design
Advanced photoresist for high density groove-recording disc
- Trang 19-21
It is necessary to reduce the mastering noise, particularly for a
groove-recording disc such as the Blu-ray disc. Despite using a deep-UV (DUV)
laser, which is the leading method of forming a groove with a narrow track
pitch, an improvement of the photoresist is also required. There are some
reports which discuss the chemical aspects of photoresist with respect to the
ROM disc signal. However, the...
#Resists #Resins #Optical noise #Noise reduction #Laser noise #Wavelength measurement #Noise measurement #Rough surfaces #Surface roughness #Optical recording
Progress in deep-UV liquid immersion mastering of high density optical discs
- Trang 299-301
In the blue generation of optical discs, the ROM capacity required on a single
layer of a 12 cm disc is 25 GB and higher. Far field deep-UV mastering equipment
has been successfully applied to record densities up to 20 GB. Higher densities,
however, are increasingly difficult to master and a further reduction of the
writing spot of the recorder seems to be required. Apart from the option to
switch...
#Lenses #Writing #Resists #Optical recording #Laser beams #Power lasers #Optical films #Read only memory #Switches #Apertures
Effect of thickness and crystallization on the optical energy gap of some chalcogenide phase-change thin films
- Trang 99-101
The chalcogenide GeSbTe semiconductor compounds are widely used in rewritable
optical disk systems such as CD-RW, PD and DVD-RAM. The readout and write/erase
properties are strongly dependent on the optical constants (refractive index n
and extinction coefficient k, absorption coefficient a) of the phase-change
layer. Therefore, the accurate determination of the optical constants of these
material...
#Optical films #Crystallization #Optical refraction #Optical variables control #Optimized production technology #Absorption #Semiconductor thin films #Refractive index #Extinction coefficients #Optical materials
Application of multi-level recording with growth-dominant material to CD and blue DVR generations
- Trang 66-68
We confirmed that the ML (reflectivity) recording with growth-dominant material
can be universally applied to any density of optical disc from CD to DVR blue.
The present study is focused on the evaluation from the view point of a
removable disc manufacturer, i.e., reliability such as overwrite cyclability and
archival and self life and volume production capability.
#CD recording #Aging #Amorphous materials #Optical materials #Size control #Crystallization #Writing #Disk recording #Optical recording #Space technology
Domain position detection MAMMOS
- Trang 22-24
This paper introduces a new technique for reading and writing data in a MAMMOS
system in which the position rather than the presence of domains is detected. We
will refer to this new technique as domain position detection or DPD-MAMMOS.
DPD-MAMMOS has several advantages over conventional MAMMOS and mitigates a
number of common problems. Through computer simulation, it is shown how this
technique c...
#Coercive force #Clocks #Coils #Lenses #Power system modeling #Magnetic properties #Laser modes #Thermal lensing #Data storage systems #Synchronization