В пятницу 20 января в Институте физики, технологии и информационных систем МПГУ состоялся семинар Кафедры теоретической физики им Э.В. Шпольского.

Докладчик: Михаил Владимирович Лапин ​ (Associate Professor, School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney ​ Angular optical sorting of nanoparticles​)

Аннотация: In this talk I will report on our results on the use of optical (and potentially acoustic) forces for selective sorting of nanoparticles. The forces employed for nanoparticle manipulation arise from the excitation of Mie resonances at frequencies which are determined by the size of nanoparticles. Therefore, for a given wavelength of the incident beam, magnitude of the resulting force depends on the size of a nanoparticle. Thus, by using several beams simultaneously, and pointing them at appropriate angles, we are able to push nanoparticles of different sizes in specific directions. In this way, drift direction is uniquely defined by particle size, for a certain range of sizes. Further on, we show that a similar separation mechanism can be achieved with the help of acoustic forces, with this method offering greater flexibility owing to tunability of acoustic source frequencies. Finally, we can discuss general advantages and limitations of this sorting method.