Abstract
A new concept of high-density memories by arrays of multidirectional V-shape pits and remote polarization readout is proposed. The polarization readout principles are examined by two model experiments. The first experiment with an array of 1 mum deep V-pits fabricated by FIB on a Si wafer, carried out under polarization microscope observation, confirmed the concept by the expected contrast variation among the pits images. Accuracy of the remote readout was examined by the second experiment configuring total reflection V-pits by a rectangular prism glued underneath a glass plate. Polarization detection sensitivity of the V-pit direction was found to be +/-0.14 degrees , which should easily accommodate 1.4 degrees =180 degrees /128 separation for 7 bits recording at every single V-pit.
Highlights
Current high-density optical recording systems in combination with a blue laser diode and a high numerical aperture (NA) optics have increased the capacity of optical disks to a 20 G-bits level in the Blu-ray system
We propose a new concept of high-density recording based on V-shape pits with a 90° valley carrying multiple bits information in their valley directions
We proposed and proved a new concept for high-density recording by imprinting an array of
Summary
Current high-density optical recording systems in combination with a blue laser diode and a high numerical aperture (NA) optics have increased the capacity of optical disks to a 20 G-bits level in the Blu-ray system. Received May 2008; revised 6 Jun 2008; accepted 7 Jun 2008; published Jun 2008 report [5], multi-bits configurations of depth controlled single pits enabling stamper reproduction were proposed These methods, require high precision in the pit shape reproduction since the principle is based on the optical multiplexing involving the reflection phase modulation by the pit geometry. Reflectance variation is of no consequence because the polarization state is defined independent to the light intensity These may help realizing a variety of high density memory applications with the pit size and detection distance selected in a range from micrometer to sub-kilometer, as in a spinning disk, static memory tags, chips and even in road information display system for car drivers. The azimuthal angle of the reflected ellipse follows the prism direction
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