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Proceedings Paper

Conductive low-index buffer layer for electro-optic polymer waveguides
Author(s): Martin Sprave; Robert Blum; Harald Bock; Hanno Beisinghoff; Hubertus Feix; Manfred Eich
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Paper 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 Tg 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.

Paper Details

Date Published: 5 October 1995
PDF: 12 pages
Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); doi: 10.1117/12.222784
Show Author Affiliations
Martin Sprave, German Telekom Research Ctr. and Technical Univ. of Darmstadt (Germany)
Robert Blum, German Telekom Research Ctr. and Technical Univ. of Darmstadt (Germany)
Harald Bock, German Telekom Research Ctr. and Technical Univ. of Darmstadt (Germany)
Hanno Beisinghoff, German Telekom Research Ctr. and Technical Univ. of Darmstadt (Germany)
Hubertus Feix, German Telekom Research Ctr. and Technical Univ. of Darmstadt (Germany)
Manfred Eich, German Telekom Research Ctr. and Technical Univ. of Darmstadt (Germany)


Published in SPIE Proceedings Vol. 2527:
Nonlinear Optical Properties of Organic Materials VIII
Gustaaf R. Moehlmann, Editor(s)

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