Document Type
Conference Proceeding
Publication Date
6-15-2001
Abstract
This paper describes the development and optimization of chiral, non-polar media with large second-order nonlinear optical responses. We employ molecular engineering, quantum-mechanical sum-over-states theory, and measurements of molecular hyperpolarizability by means of Kleinman-disallowed hyper-Rayleigh scattering in order to understand molecular properties. Then we analyze the appropriate arrangement of the chromophores that produce an optimum axial nonlinear optical medium. Chromophores with large Kleinman disallowed traceless symmetric second rank tensor hyper-polarizabilities β can be aligned so as to result in large susceptibilities, (2), in structures that lack polar order. We found that Λ-shaped chromophores with C2v or similar symmetry are good candidates for these materials as they can exhibit large second-rank components of the hyperpolarizability tensor. A wide variety of techniques can be used to fabricate bulk materials belonging to the chiral non-polar symmetry groups, D∞ and D2. The microscopic chromophore alignment schemes that optimize the NLO response in such materials are deduced from general symmetry consideration for both molecules and bulk.
Keywords
chromophores, molecular dynamics, nonlinear optics, partial differential equations, quantum theory, tensors, chiral media, Kleinman-disallowed hyper-Rayleigh scattering, molecular engineering, molecular hyperpolarizability, quantum-mechanical sum-over-states theory, Schrodinger equation, electrooptical materials, Rayleigh scattering
Publication Title
Proceedings of SPIE
Rights
© 2001 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Recommended Citation
Citation format: Ostroverkhov V., Ostroverkhova O., Petschek R.G., Singer K.D., Sukhomlinova L., Twieg R.J., "Optimization of the nonlinear optical response in chiral media," Proceedings of SPIE - The International Society for Optical Engineering 4279, 25-36, 2001.