Results of numerical simulation of near-field optical data storage using microstrip probe are presented. Simulation is
carried out on the basis of the finite-difference time-domain method. Features of the information reading process from
the ROM and RW (based on the phase transmissions of Ge2Sb2Te5 film) formats of optical discs under illumination and
illumination-collection mode are analyzed and considered. Mathematical modeling has shown that the signal from the
ROM-format disc under illumination mode, despite the fact that the probe has a significant far-field transmission
coefficient, has a large crosstalk and small spatial resolution (significantly worse than a size of probe aperture). Unlike
illumination mode, signal under illumination-collection mode (pure near-field method) has a resolution close to the size
of the aperture, good amplitude and contrast, as well as relatively low crosstalk. However, information reading under
illumination-collection mode from RW-format disc is not able to get the same good quality signal. Therefore the further
optimization of the method is required to improve the signal quality of RW format.
Results of implementation of technical solution for long term data storage technology on the basis of single crystal
sapphire are presented. The effect of birefringence on the distribution of the focused laser beam through a uniaxial
birefringent medium having a vertical orientation of the optical axis is analyzed. An expression for the calculation of the
geometric aberrations of the focused laser beam in single-crystal substrate of the optical disc has been presented. It is
shown that the problem of data reading through a substrate of negative single crystal sapphire can be solved by using for
reading a special optical system with a plate of positive single crystal materials. The experimental results confirm the
efficiency of the proposed technical solution.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.