Three-dimensional model of quantum dots' self-assembly under the laser field action

This study considers the self-assembly process of quantum dots to nanostructures with the predefined geometry, which proceeds in the external resonant laser field within the three-dimensional model of Brownian dynamics. Average aggregation time of nanoparticles depending on the external field wavelength was calculated. The probability of such structures formation was estimated for the calculated average aggregation time and for the pulse duration of the laser used in the experiment.The reported study was funded by RFBR and Krasnoyarsk Krai according to the research project No. 16-42-240410r_a and RFBR research project No. 16-32-00129

Three-dimensional model of quantum dots' self-assembly under the action of laser radiation

This study considered a process of quantum dots' self-assembly into nanostructure arrays with predefined geometry, which proceeds in the external resonant laser field. We considered the simplest case of assembling a stable structure of two particles. The problem was solved numerically using a three-dimensional model of Brownian dynamics. The idea of the method is that the attraction of the dots occurs due to the interaction of resonantly induced dipole moments, with the dots being then captured by the Van der Waals force. Finally, a three-dimensional model was considered; the average nanoparticle aggregation time as a function of the laser radiation wavelength was calculated; the probability of such structures' being formed was estimated for the calculated average aggregation time and for the laser pulse duration used in the experiment. The wavelength of the maximum probability was found to be shifted from the single particle resonance wavelength of 525 nm to the red area of 535 nm, which is in qualitative agreement with the redshift of the resonance wavelength of interacting particles.The work was funded by the Russian Foundation for Basic Research (RFBR) and Krasnoyarsk Krai administration under research project No. 16-42-240410r_a, RFBR research project No. 16-32-00129 and by the Ministry of Education and Science of the Russian Federation (Grant 3.6341.2017/VU)