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Unformatted text preview: Introduction On Organic Nonlinear Optical Materials Yong Song Department of Physics, University of Cincinnati,Cincinnati,OH,45220 Abstract Organic materials are important materials for the fast processing of in- formation and for optical storage applications. This paper tries to have a quick look at their properties and some effects. 1. Introduction Recent developments in the field of nonlinear optics(NLO) has pushing organic second-order nonlinear optical materials into practical applications. Nonlinear optical materials are the materials in which light waves can interact with each other. This paper presents an brief introduction on the organ nonlinear optical materials. 2.Molecular Polarizabilities The following equation describe the normal nonlinear optical effects: P i = P ,i + ( (1) ij E j + (2) ijk E j E k + (3) ijkl E j E k E l + P is the spontaneous polarization and ( n ) is the n th order susceptibility tensor. Is the vacuum permittivity. E is the applied electric field. In organic materials the optical properties are determined by the molec- ular polarizabilities. The following equation expressing the molecular dipole moment p as: p i = g,i + ( ij E j + ijk E j E k + ijkl E j E k E l where g,i is the ground state dipole moment, ij is the linear polarizabil- ity, ijk is the second-order polarizability or first-order hyperpolarizability, ijkl is the third-order polarizability or second-order hyperpolarizability. The electric field is the one at the location of the molecule. 1 Fig1 shows the different of optical effects between first and second order nonlinear optical materials....
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- Fall '11