Mr. Maomao Huang Profile

Maomao Huang

at Peking Univ

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Proceedings Article | 28 January 2005 Paper

Full functional photorefractive molecule with large two-beam coupling gain

Maomao Huang, Zhijian Chen, Jun Shi, Jie Zhang, Shaokui Cao, Qihuang Gong

Proceedings Volume 5646, (2005) https://doi.org/10.1117/12.575898

KEYWORDS: Molecules, Electro optics, Modulation, Refractive index, Crystals, Absorption, Diffraction, Signal detection, Polarizability, Chromophores

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We have synthesized two Carbazole-based monolithic monomers, 3-[9-(2-Ethyl-hexyl)-9H-carbazol-3-yl]-2-(4-nitro- phenyl)-acrylonitrile (M1) and (Z)-2-((9-(4-ethylhexyl)-9H-carbazol-6-yl)methylene)-4-oxopentanenitrile (M2), which contain both photoconductive and electro-optic chromophore. The melting point were measured to be 151 oC (M1) and 77 oC(M2) respectively, which are higher than the room temperature. No crystallization of their films is observed at room temperature. One of the monomers M1 exhibits good photorefractive performance. The two-beam coupling gain coefficient of M1 is measured to be 372 cm^-1 at 50 V/um, while the two-beam coupling gain coefficient of M2 is only 17 cm^-1 at 42 V/um. By applying ellipsometric technique, we deduced that the better PR performance of M1 was due that M1 has larger effective electro-optic coefficient. The photorefractive index modulation of M1 was measured to be 6x10^-3 at an electric field of 48.3V/μm. Further investigation on the structure-property relationship has also been demonstrated.

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