Lapchuk A. Physical and technical foundations of high-denssity optical data storage

The dissertation reports the physical and technical foundations of high-density optical data storage (ODS). Three method of optical data storage are considered: 1) solid immersion; 2) multilayer data carrier; 3) near-field. The new direction in solid-immersion ODS is developed, characterized in that it uses tapered dielectric waveguide instead of hemispherical lens, open end of which forms a subwavelength aperture. Waveguide structure of a disk drive simplifies the design and decreases a crosstalk signal. In addition, it can be produced by the integrated optics technology. The method for analysis and modeling of multilevel ODS is developed. It is found that dissipative losses of recording layers have a critical influence on the number of recording layers and that multilevel ROM disk based on lossless recording layers can have tens of layers and information capacity of 1TB. The new direction in near-field ODS on the basis of microstrip probes is developed. It is found that illumination-collection mode of near-field method with microstrip probe and the registration layer with large dissipative losses will give the strongest gain in the optical efficiency and large reduction of cross-talk signal. It is proved that the proposed methods will allow writing more than 2 Tbytes of information on one disc. The theoretical aspects of speckle in the laser projectors were worked out. The new speckle reduction methods are developed. The laser pico-projector prototype with speckle contrast of 5% in white light has been elaborated.