Electro-optic Modulation Based on Channel Waveguide of Organic Single Crystal Material

Abstract

Channel waveguide is the basic element in fabrication of electro-optic modulator for external electro-optic modulation. Using polymer electro-optic materials, channel waveguide device can be comparative easily fabricated, but the main problem for polymer materials is their stability. On the other hand, organic single crystal has excellent stability, the disadvantage of them is the difficulty in processing which limited their application potential. Recently, channel waveguide has been fabricated by direct growth inside the hollow fiber, but those channel waveguides proved to be difficult to fabricate electrode besides the crystal [1]. By combining ideas of growth of crystal from hollow fibre and shear method [2], a new method able to fabricate raised-up channel waveguide of organic crystal was initiated. In this method, solution of organic molecule was introduced between two substrates, one of them has patterned lines on it. Due to the polar interaction between the substrate materials and molecules of the solution, Single crystal channel waveguides were grown along the patterned line on the substrate, the dimension and direction of the crystal materials were controlled by these patterned lines. Fig.1 illustrated the diagram of this method.