Low-loss waveguides of benzylidene-aniline derivatives by organic molecular beam heteroepitaxy.
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 dB/cm by the insertion of the MNBA-Et homoepitaxial layer.
Yamashiki
Tomoya
T
Electronic and Imaging Materials Research Laboratories, Research and Development Division, Toray Industries, Inc., 3-2-1 Sonoyama, Ohtsu-shi, Shiga 520-0842, Japan. tomoya_yamashiki@nts.toray.co.jp
Tsuda
Keiji
K