Conductive low-index buffer layer for electro-optic polymer waveguides

Martin Sprave; Robert Blum; Harald Bock; Hanno Beisinghoff; Hubertus Feix; Manfred Eich

doi:10.1117/12.222784

5 October 1995 Conductive low-index buffer layer for electro-optic polymer waveguides

Martin Sprave, Robert Blum, Harald Bock, Hanno Beisinghoff, Hubertus Feix, Manfred Eich

Proceedings Volume 2527, Nonlinear Optical Properties of Organic Materials VIII; (1995) https://doi.org/10.1117/12.222784
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

An inorganic methyl-siloxane based buffer material has been investigated that is suitable for nonlinear optical waveguides used in integrated electro-optic devices. Slab waveguide structures were fabricated to study the influence of buffer layers on poling mechanisms. Poling currents and second harmonic intensities were measured simultaneously under various poling conditions. Maximum poling efficiency for sandwich structures was found to be close to T_g being identical to samples without buffer. Poling currents first decreased with time following a t^-4 dependence and finally reached a steady-state value. Resistivities were determined from saturation currents for different temperatures and electric field strengths. An Arrhenius-like temperature dependence of the resisitivity was found for both buffer materials and NLO polymer in its glassy state. For both materials a Schottky-type dependence of the resisitivity on the elctric field strength was observed at poling tempertures. Charge injection currents into buffer were found to be one order of magnitude smaller than into the NLO polymer. Electro-optic coefficients of poled samples with and without buffer layer were measured providing that even higher degrees of chromophore orientational order can be achieved in samples with buffer due to an increased electrical breakdown limit. A low index of refraction and a high transmittance were determined for the whole visible to near infrared spectral region. Channel waveguides wer realized by photobleaching.

Citation Download Citation

Martin Sprave, Robert Blum, Harald Bock, Hanno Beisinghoff, Hubertus Feix, and Manfred Eich "Conductive low-index buffer layer for electro-optic polymer waveguides", Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); https://doi.org/10.1117/12.222784

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