Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Photonics 2

Q 30.8: Vortrag

Mittwoch, 16. März 2011, 12:15–12:30, SCH A118

Electro-optical induced waveguides in isotropic phase liquid crystals-oil mixtures — •Martin Blasl, Kirstin Bornhorst, and Florenta Costache — Fraunhofer Institut for Photonic Microsystems, Maria-Reiche-Str. 2, 01109 Dresden, Germany

Optical multiplexers based on electro-optical (EO) materials are used to route signals in sensor applications. EO induced wave-guides are of interest for wavelength independent multi-mode and wavelength selective mono-mode operation and fast multiplexing.

Liquid crystals exhibit above their clear point (nematic-isotopic transition temperature) the second order EO effect. We created novel EO mixtures of 5CB liquid crystals-immersion oil with modified clear point as it was determined by DSC-technique.

The temperature dependent Kerr effect as well as the refractive indices were measured with a combined refractometric - interferometric technique. We observed that the Kerr activity is still present in the mixtures.

Designs of basic EO induced waveguides containing the new mixtures and various ITO-electrodes pathways were fabricated for switching, attenuation and deflection of light.

We show that dynamic optical waveguides with low insertion loss and bandwidth larger than kHz could be generated in the new mixtures for a broad temperature range.

We compare the measured optical guiding efficiency in the fabricated devices with FEM-simulations of designed EO induced waveguide devices using the measured Kerr constants.