Electro-optical (EO) waveguides induced in EO materials by applying electric fields across defined regions, shown in Fig. 1(a), offer great potential for applications in good integrable and reliable photonic devices. From the variety of materials suitable for such so-called electro-optically induced waveguides (EOIW), very promising are certain nematic liquid crystals (LC) in their isotropic phase, which in particular near their clearing point exhibit large Kerr coefficients (about 10−10 m/V2), transparency in visible-infrared range as well as short response times (<1 μs) [1]. In this paper, a device based on the concept of EOIW in isotropic liquid crystals is designed and characterized. Experimental data on the fiber to EOIW coupling efficiency and corresponding losses are obtained and compared to results from FEM simulations. It is shown that at higher voltages the losses are dominated by the set-in of an electric field induced nematic-isotropic phase transition (see also [2]).
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机译：通过在图1所示的跨限定区域施加电场在EO材料中诱导的电光（EO）波导。如图1（a）所示，为良好的可集成和可靠的光子器件提供了很大的应用。从适用于这种所谓的电光诱导的波导（EoiW）的各种材料，非常有前途是它们各向同性相中的某些向列液晶（LC），特别是在其清除点附近表现出大型克尔系数（约10 < sup> -10 m / v 2 ），可见红外范围的透明度以及短响应时间（<1μs）[1]。在本文中，设计了基于各向同性液晶eoiw概念的装置。获得了对EoIW耦合效率和相应损耗的纤维的实验数据，并与FEM模拟产生的结果。结果表明，在较高的电压下，损耗由电场诱导的向上各向同性相转移的设定来支配（另见[2]）。
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