Document Type
Article
Publication Date
2001
Abstract
This paper describes the development and optimization of chiral, nonpolar 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 hyperpolarizabilities /spl beta/ can be aligned so as to result in large susceptibilities /spl chi//sup (2)/ in structures that lack polar order. We found that /spl Lambda/-shaped chromophores with C/sub 2v/ 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 nonpolar symmetry groups D/sub /spl infin// and D/sub 2/. The microscopic chromophore alignment schemes that optimize the nonlinear optical response in such materials are deduced from general symmetry consideration for both molecules and bulk. We also speculate on the possible application of such materials as high-bandwidth spatial light modulators.
Keywords
bandwidth, chromophores, liquid crystals, molecular physics, quantum theory, tensors, electrooptic materials, nonlinear optics, Rayleigh scattering
Publication Title
IEEE Journal on Selected Topics in Quantum Electronics
Rights
The following IEEE notice should appear prominently on the first page/screen of each reprinted paper, with the appropriate details filled in: © 2001 IEEE. Reprinted, with permission, from Ostroverkhov V., Ostroverkhova O., Petschek R.G., Singer K.D., Sukhomlinova L., Twieg R.J., Prospects for chiral nonlinear optical media, IEEE Journal on Selected Topics in Quantum Electronics, 2001. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Case Western Reserve University's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
Recommended Citation
V. Ostroverkhov, O. Ostroverkhova, R. G. Petschek, K. D. Singer, L. Sukhomlinova and R. J. Twieg, "Prospects for chiral nonlinear optical media," in IEEE Journal of Selected Topics in Quantum Electronics, vol. 7, no. 5, pp. 781-792, Sept.-Oct. 2001, doi: 10.1109/2944.979339.