Solid-Liquid Crystal Interfaces Probed by Optical Second-Harmonic Generation

Drevenšek‐Olenik, Irena; Soria, Silvia; Čopič, Martin; Marowsky, G.; Rasing, T.H.M.

doi:10.1007/978-3-662-10157-5_6

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“…17 Experiments with various LC systems demonstrated that SSHG can be used as a very convenient tool for studying LC surface alignment mechanisms. [18][19][20] Besides the above described sources, there exist quadrupolar and other multipolar mechanisms that can cause SHG even in the uniform nematic phase. But, their magnitude is in general much lower.…”

Section: Introductionmentioning

confidence: 99%

Optical second harmonic generation in a ferromagnetic liquid crystal

et al. 2019

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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 analysed. 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.

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Section: Introductionmentioning

confidence: 99%