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Introduction On Organic Nonlinear Optical Materials



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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 information 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 1 This paper presents an brief introduction on the organ nonlinear optical materials 2 Molecular Polarizabilities The following equation describe the normal nonlinear optical effects 1 3 2 Pi P0 i 0 ij Ej ijk Ej Ek ijkl Ej Ek El P0 is the spontaneous polarization and n is the nth order susceptibility tensor 0 Is the vacuum permittivity E is the applied electric field In organic materials the optical properties are determined by the molecular polarizabilities The following equation expressing the molecular dipole moment p as pi g i 0 ij Ej ijk Ej Ek ijkl Ej Ek El where g i is the ground state dipole moment ij is the linear polarizability 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 1 Fig1 First and Second Order nonlinear optical effects Pure first order nonlinear optical effects are in the left and the pure second order effects are in the right hand side The middle column shows the effects related to both types of nonlinearity the photorefractive effect and the cascaded optical Kerr effect 2 The tensors ijk and ijk describe the second order nonlinear optical and electro optic effects They are third rank tensors in the



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