Abstract
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]).
© 2013 IEEE
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