Second order nonlinear optical response at the two-photon resonance in a two-dimensional NLO molecule

G. Meshulam, P. Shaier, G. Berkovic, A. Ben-Asuly, R. Mazor, L. Shapiro, V. Khodorkovsky, Z. Kotler

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Rod-shaped organic nonlinear optical molecules are generally described as one-dimensional molecules with a single β component. However, analogous molecules having a carbazole group as the electron donor, exhibit special two-dimensional second harmonic behavior due to the presence of two β components, a positive βzzz and a negative βzxx. Those components arise from different transitions within the molecule. The effective β of these molecules, measured using either EFISH or the thin film technique in the off-resonance regime, is very small since the two components cancel each other. However, the same measurement in the two-photon resonance regime yields a very strong amplitude enhancement of β which is fitted well by a simplified three-level model.

Original languageEnglish
Pages (from-to)321-326
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics
Volume25
Issue number1-4
StatePublished - 1 Dec 2000
Externally publishedYes

Keywords

  • Organic NLO molecule
  • Two-photon resonance

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