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Proceedings Paper

Effect of carbazole as a donor moiety on the second-order nonlinearity of organic molecules
Author(s): Guilia Meshulam; Garry Berkovic; Zvi Kotler; Amos Ben-Asuly; Royi Mazor; Lev Shapiro; Vladimir Khodorkovsky
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Paper 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.

Paper Details

Date Published: 11 October 1999
PDF: 8 pages
Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368285
Show Author Affiliations
Guilia Meshulam, Soreq Nuclear Research Ctr. (Israel)
Garry Berkovic, Soreq Nuclear Research Ctr. (Israel)
Zvi Kotler, Soreq Nuclear Research Ctr. (Israel)
Amos Ben-Asuly, Ben-Gurion Univ. of the Negev (Israel)
Royi Mazor, Ben-Gurion Univ. of the Negev (Israel)
Lev Shapiro, Ben-Gurion Univ. of the Negev (Israel)
Vladimir Khodorkovsky, Ben-Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 3796:
Organic Nonlinear Optical Materials
Manfred Eich; Manfred Eich; Mark G. Kuzyk, Editor(s)

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