【学术报告】Irena Drevenšek-Olenik----Optical second harmonic generation in a ferromagnetic liquid crystal

发布者:邢晓东发布时间:2019-09-05浏览次数:10

报告题目:Optical second harmonic generation in a ferromagnetic liquid crystal

报告人: Irena Drevenšek-Olenik

     Faculty of Mathematics and Physics

                University of Ljubljana and J. Stefan Institute

                Ljubljana, Slovenia

时间:2019年91210:00

地点:泰达应用物理研究院四楼报告厅

Abstract:  A comparative experimental investigation of the dependence of second harmonic generation (SHG) on applied external voltage between the standard nematic liquid crystalline material and an analogue ferromagnetic nematic liquid crystalline material was performed by using a fundamental optical beam at 800 nm wavelength. For a ferromagnetic material, the dependence of SHG on an applied magnetic field was also examined. Three different polarization combinations of the fundamental and the second harmonic radiation were analyzed. The SHG signal observed in the former material is attributed to a combination of electric field-induced SHG (EFISHG) and flexoelectric deformation-induced SHG, while SHG signal observed in the latter material is attributed solely to flexoelectric deformation-induced SHG. The obtained dependences of the SHG signal on the associated optical retardation show that in the most favourable polarization combination the two contributions generate about the same effective nonlinear optical susceptibility.

 

邀请人:张心正教授

 

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