Materials Science and Engineering Seminar

February 14, 2017
February 14, 2017
Speaker: Dr. Alexandros Gerakis
                 Princeton Plasma Physics Lab  
Title: In Situ Gas and Nanoparticle Measurements with Coherent Rayleigh-Brillouin Scattering
Time: 11:45 a.m. - Refreshments
           12:10 p.m. - Seminar
In this talk an overview of the work done at the Laboratory for Plasma Nanosynthesis at Princeton Plasma Physics Laboratory will be given with special emphasis to the laser diagnostic techniques employed for the in situ detection of arc produced nanoparticles and in particular to the development and application of a new laser diagnostic for the in situ detection of large molecules and nanoparticles, termed coherent Rayleigh Brillouin scattering. This four wave mixing diagnostic technique relies on the creation of an optical lattice in a medium due to the interaction between polarized particles and intense laser fields. Though this interaction, we can detect the temperature, pressure, relative density, polarizability and speed of sound of a gas and gas mixture. This diagnostic was already successfully demonstrated in atomic and molecular gaseous environments, where the different gas polarizabilities and pressures were successfully measured. We are currently conducting measurements with large molecules and nanoparticles, the results of which will be presented in this talk.
Alexandros Gerakis obtained his BSc from the School of Applied Mathematical and Physical Sciences, National Technical University of Athens. He then moved to Scotland, UK, to obtain his Master’s degree from St Andrews and Herriot-Watt Universities, in "Photonic and Optoelectronic Devices". His PhD was obtained from University College London, under the supervision of Professor Peter Barker. The research he conducted there was regarding coherent Rayleigh-Brillouin scattering, but also the utilization of chirped optical lattices for the creation of ultracold H2 molecular ensembles using the optical Stark deceleration method. He stayed at the same group as a postdoc, before crossing the Atlantic for a postdoc at Harvard University under the supervision of Professor Ni, in work relating to creating single ultracold NaCs molecules for use in ultracold chemistry studies. He is currently an Associate Research Physicist at the Princeton Plasma Physics Laboratory where he is responsible for the development of the coherent Rayleigh Brillouin scattering diagnostic at the Laboratory for Plasma Nanosynthesis.
Hosted by Laura Fabris, Ph.D.