Abstract

An organic nonlinear optical crystal waveguide consisting of 4^′-nitrobenzylidene-3-acetamino-4-methoxyaniline (MNBA) and 4^′-nitrobenzylidene-3-ethylcarbonylamino-4-methoxyaniline (MNBA-Et) has been fabricated by a two-step heteroepitaxial growth technique. An MNBA-Et homoepitaxial layer used as a buffer layer prevents the formation of a MNBA polycrystalline domain at the heteroepitaxial interface. The MNBA-Et homoepitaxial layer also improves the crystallinity of a single-domain MNBA heteroepitaxial layer. The transmission loss of the MNBA–MNBA-Et slab waveguide is reduced to less than $3 \mathrm{dB}/\mathrm{cm}$ by the insertion of the MNBA-Et homoepitaxial layer.

© 2003 Optical Society of America

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