28.10. Ultrafast optics of ultrathin material



 Public examination of a doctoral dissertation in the field of physics

Doctoral candidate: M.Sc. Petr Obraztsov 

Date and venue: 28.10.2011 at 12 noon, M102, Metria, Joensuu campus 

Recently graphene become one of the hottest topics in physics. The unusual electronic and optical properties which demonstrate this 2D material allow one to propose wide range of future applications for graphene. Among them graphene-based optoelectronic devices, laser components and switchers, solar cells and ultrafast photo detectors. However, in spite of intensive research of graphene properties during last years, many of properties remain quite unknown. 

The dissertation “Nonlinear optical phenomena in graphene based materials“ by Petr Obraztsov is devoted to experimental investigation of graphene based materials properties under intensive laser irradiation. In particular the properties of several atomic layers graphene films and carbon nanotubes were studied. The results obtained in this work demonstrate the possibility to use novel materials based on graphene in lasers to generate ultrashort pulses (up to several femtoseconds). Such type of ultrashort pulse lasers can be used in optical communication, medicine and material processing. Another promising result presented in this thesis is the demonstration of possibility to use graphene as an efficient source of electromagnetic radiation at a terahertz frequency. This kind of EM sources is on demand of security and defense applications as well as medicine. 

The doctoral dissertation of Petr Obraztsov entitled “Nonlinear optical phenomena in graphene based materials The opponent in the public examination is Professor Esko Kauppinen, Aalto University and the custos is Professor Kai-Erik Peiponen of the University of Eastern Finland.” will be examined at the Faculty of Science and Forestry.

Photo available for download at http://www.uef.fi/vaitoskuvat

Contact: Petr Obraztsov, petr.obraztsov@uef.fi, p. +358 44 932 5541

Publishing year: 2011

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