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In this paper we report the major fabrication steps and preliminary electro-optical characterization of a novel integrated liquid crystal optical waveguide on silicon substrate. The optical waveguide is made of a SiO2/Si V-groove with a triangular cross-section filled with nematic liquid crystal E7. The optical propagation in the channel waveguide is controlled by an external voltage which induces a refractive index variation by means of molecular director reorientation. For TM polarized light at a wavelength of 1.55 μm, a threshold voltage of only about 2 V and an extinction ratio higher than 35 dB were measured with 6.5 V applied.
Taylor & Francis Group
Publication date: 
3 Mar 2009

Rita Asquini, Domenico Donisi, Marco Trotta, Antonio d'Alessandro, Bob Bellini, Giovanni Gilardi, Romeo Beccherelli

Biblio References: 
Volume: 500 Issue: 1 Pages: 23-30
Molecular Crystals and Liquid Crystals