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Currently, all manipulation works are now heading for reducing the size of the moving objects. There are plenty of microparticles manipulation methods using optical traps of different types. However, it is desirable to have a method to move a relatively large micro-objects. Especially such objects could be found in biological research (sporules, microslides of tissue, large cells). And it is necessary to prevent an effect even of a minimum quantity of light radiation on the biological micro-object. It is possible to carry out mechanical micro-manipulation by means of mechanical micro tweezers. This method is invasive for microparticles manipulating. Typical sizes of the roaming micro-objects using common optical trap are from fractions of a micrometer to about ten micrometers. It is necessary to significantly increase the power of the light beam with the increase of the micro-objects size. Because anyway some fraction of the light beam energy is absorbed by the object, there is a certain limit for the microparticles size which can be moved by the forces of optical trapping. The precise value of this size depends on many parameters: the micro-objects absorption coefficient, fluid properties, micro-object surface shape, etc. A rough estimate of this size for transparent spherical micro-objects gives a value of about 30 μm. It should be noted that the micro-object with a size close to the limit is experienced strong thermal impact. Things get worse with the movement of opaque micro-objects in the light traps. The limiting size is reduced by one and a half to two times. At the same time, the micro-objects with sizes up to 100 microns are still quite small for a mechanical movement. There is another complicate combined method of micro-objects grasping with the usage of light and ultrasound [5]. But here is another [6] described simpler method of moving micro-objects by means of the microexplosions of polystyrene microparticles in a beam of an ultraviolet laser with a wavelength of 355 nm. In this paper we will consider a method of moving micro-objects with explosion of polystyrene microparticles on a substrate coated with a layer of aluminium. As compared with microexplosions on a quartz substrate, this method significantly reduces expended energy of microexplosions due to the interference of the beam, which is incident on the substrate and a beam reflected from the surface of the substrate.Object of study in this research is calculation average velocity polysterene microparticles with diameter equals 5 micron after microexplosion occurring under the pressure of laser emission with wavelength 355 nanometers. The subject of the study is the behavior of polystyrene micro-particles in the explosion. The aim of this work is the experimental test of interference effect between incident and reflected beams in the explosion on a substrate covered with aluminum. Another aim of this work is the calculation of scattering speed of microparticles after the explosion and finding the parameters for explosion occurrence. In accordance with the intended aims following tasks were summarized:  in situ observation of polystyrene microparticles microexplosion on a substrate covered with aluminum under the action of ultraviolet laser with a wavelength of 355 nm;  the calculation of the average dispersion velocity of polystyrene microparticles after the explosion;  finding the system parameters for the observed microexplosions of polystyrene microspheres. Scientific and practical novelty and significance of the results:   full-scale experiment with the microexplosion of polystyrene microparticles on a substrate covered with aluminum under the action of an ultraviolet laser with a wavelength of 355 nm was successfully completed.  the average expansion rate of polystyrene microparticles after microexplosion was calculated.  the system parameters for the observed polystyrene microspheres microexplosions were found.

Microexplosions polysterene microparticles on substrate covered by aluminum