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I. SEMICONDUCTOR MATERIAL HIGH RESISTIVITYA was grown by the float-zone technique. Its long carrier lifetime ( T > s) enabled it to obtain a high electron-hole plasma density at moderate illumination levels. A 75"-diameter, 1.9-mm-thick slab was cut from the ingot. To decrease surface recombination, both of the flat sides of the slab were finished by chemical-mechanical polishing. EXPERIMENTAL SETUPTo produce a nonequilibrium plasma, we illuminated the slab with a pulsed xenon lamp through a grating mask (Fig. l), fabricated by printing opaque strips on transparent film, and .entirely transparent to MMW. The incident MMW beam was formed by a horn antenna. The combination of the MMW frequency, 92 GH7, the refractive index of silicon, 3.45, and the slab thickness, 1.9 mm, satisfied the conditions for suppressing Fresnel reflection at normal incidence. The MMW beam that passed through the silicon slab was detected by a GaAs Schottky diode coupled with a second horn antenna. The detector was mounted on a rotating arm to measure the angular distribution of the diffracted beam. The pumping light pulses were monitored using a reference photodiode that detected pumping light reflected from the slab. Both the rectified signal

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We have explored a model of vacuum self-organization based on dissipative dynamics and recurrent self-interactions. The initial state of the vacuum is assumed as self-interacting vacuum dust. The medium is dispersive and resembles dark-energy vacuum as described by general relativity. Beside selfdiffusion, vacuum dust endowed with self-attraction, resembling Newton's gravity. We explored what would happen with this medium when the strength of self-gravitation progressively increases. We observed a cascade of phase transitions. First transition occurs when self-attraction reaches the point when it can balance self-diffusion. A vortex-cellular structure emerges. Vortexes operate as self-sustained oscillators and tend to synchronize their dynamics. They form a synchronized network that possesses a universal time scale and, after zooming out, its structure acquires a form of fiber-bundle structure of electromagnetic field. With increasing self-gravitation strength, the system experiences another phase transition. The fiber-bundle structure becomes resembling that of weak nuclear field. Vacuum cells acquire spinorial dynamics. Electric charges emerge. When synchronized, the weakly interacting cells create lepton-like molecules. Oscillating charges in spinorial cells give a birth to current loops, which magnetic moment linked to the particle spin. During the next phase transition, the cell dynamics experiences another topological transformation, which is accompanied by creation of three color charges. The acquired fiber-bundle structure form resembles that of strong nuclear field. Synchronized strongly interacting vacuum cells create quark-like particles that carry color charges. We associate their complex synchronization patterns with particle flavors. We also explored statistical distributions of vacuum cells as functions of self-gravitation strength. We found that the distribution spectrum is essentially discrete, and the vacuum cells group around the states that we call super-attractive. Discrete cell distribution implies charge quantization. Synchronization transforms initial Boltzmannlike distribution into quantum-like distributions. During phase transitions, cell distributions experience transformations that can be encoded in the