Effect of carbazole as a donor moiety on the second-order nonlinearity of organic molecules

Guilia Meshulam; Garry Berkovic; Zvi Kotler; Amos Ben-Asuly; Royi Mazor; Lev Shapiro; Vladimir Khodorkovsky

doi:10.1117/12.368285

11 October 1999 Effect of carbazole as a donor moiety on the second-order nonlinearity of organic molecules

Guilia Meshulam, Garry Berkovic, Zvi Kotler, Amos Ben-Asuly, Royi Mazor, Lev Shapiro, Vladimir Khodorkovsky

Proceedings Volume 3796, Organic Nonlinear Optical Materials; (1999) https://doi.org/10.1117/12.368285
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The second order nonlinearity of conjugated organic molecules involving, 1,3 indandione derivatives as an acceptor moiety has been studied. Varying the donor from dialkylamino to the chemically similar substituent, N- carbazolyl resulted in a drastic reduction of electric field induced second harmonic (beta) values. For some molecules, even a small negative value of (beta) was received. Quantum chemical calculations indicate that the decrease occurs as a result of two overlapping transitions, which contribute to (beta) with opposite signs. The charge transfer band gives a positive (beta) _{zzz along the molecular long axis, while a transition essentially within the carbazole moiety provides a negative (beta} _{zzz contribution to (beta} ^EFISH. Thus, these molecules must be described with a 2D model as opposed to the 'classical' model of 1D nonlinear optical chromophores. The prediction of the 2D model was verified experimentally by using a combination of two methods, EFISH and Hyper-Rayleigh Scattering, which probe different combination of the (beta) tensor elements.

Citation Download Citation

Guilia Meshulam, Garry Berkovic, Zvi Kotler, Amos Ben-Asuly, Royi Mazor, Lev Shapiro, and Vladimir Khodorkovsky "Effect of carbazole as a donor moiety on the second-order nonlinearity of organic molecules", Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); https://doi.org/10.1117/12.368285

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