Dispersion of Third Order Optical Nonlinearity of Pseudoisocyanine J-Aggregates | Zendy

R. Gadonas | Zendy; A. Pugžlys | Zendy; K.H. Feller | Zendy

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Dispersion of Third Order Optical Nonlinearity of Pseudoisocyanine J-Aggregates

Author(s) -

R. Gadonas,

A. Pugžlys,

K.H. Feller

Publication year - 1997

Publication title -

laser chemistry

Language(s) - English

Resource type - Journals

eISSN - 1026-8014

pISSN - 0278-6273

DOI - 10.1155/1997/37594

Subject(s) - exciton , dispersion (optics) , j aggregate , chemistry , annihilation , figure of merit , analytical chemistry (journal) , physics , optics , condensed matter physics , quantum mechanics , chromatography

Dispersion of degenerate four-wave mixing (DFWM) efficiency near the exciton resonanceof aggregates of 1, 1 ′ -diethy1-2- 2 ′ -cyanine (pseudoisocyanine, PIC) chloride is reported.Correlation with the spectrum of imaginary parts of nonlinearity obtained by pump andprobe techniques is discussed. Third order nonlinear susceptibility of PIC aggregateshas been calculated supposing highest density packing attainable by Langmuir-Blodgetttechnique. The nonlinear figure-of-merit of aggregates was evaluated, which is intensitydependent due to exciton annihilation. Observed intensity and wavelength dependenceof mixing efficiency is qualitatively explained in terms of absorption saturation, excitonannihilation, and subsequent generation of an excess diagonal disorder by vibrationalenergy accumulated in aggregates.

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