学术报告
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9月12日10:00
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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