Abstract
Formation of three-dimensional (3D) patterns of 0.2–0.5μm diameter voids inside a transparent solid has been demonstrated. The nano-voids could be created with a spacing ∼2μm thus suggesting the possibility of permanent 3D optical memory with density ∼100Gbit/cm3. Extremely high pressures of ∼10TPa and temperatures up to 105K can be produced by a single sub-picosecond laser pulse tightly focused inside transparent dielectrics. Analysis of the size of the void and the shock affected zone as a function of the deposited energy shows that the experimental results can be explicitly understood on the basis of conservation laws and be modeled by plasma hydrodynamics. Therefore, the size of the void can be controlled and predicted by proper focusing conditions and laser parameters.
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