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Continuous control of third-order optical nonlinearity in charge-transfer-type conjugated polymers
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Figures

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FIG. 1.

Chemical structures of three CT polymers PThQx, PAE, and PThTz, and non-CT polymer PTh.

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FIG. 2.

Absorption spectra (solid lines, lower and right axes) and spectra measured by the THG method (solid circles, upper and left axes) for the four polymers. The data for PThQx and PTh were obtained from Refs. 8 and 9, respectively.

Image of FIG. 3.

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FIG. 3.

Max vs peak values of absorption coefficient around transitions.

Tables

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Table I.

HOMO and LUMO energies of constituent monomers, calculated by the MOPAC/PM5 method. For convenience in the calculations, alkyl chains are omitted for Th,Qx, BTz, and Tz and shortened as– for BzO.

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/content/aip/journal/apl/92/3/10.1063/1.2837643
2008-01-25
2014-04-25

Abstract

Third-order optical nonlinearity was investigated in two charge-transfer (CT)-type conjugated polymers, poly(aryleneethynylene) and poly(thiophene-alt-thiazole), using the third-harmonic generation (THG) method. Comparison of the results with previously obtained THG data for polythiophene and the strong CTpolymer poly(thiophene-alt-quinoxaline) revealed that the ratio of the maximum value of third-order nonlinear susceptibility and the absorption coefficient increased as the degree of CT character increased for the four polymers. This variation in is discussed based on the magnitude of the transition dipole moment between the one-photon-allowed and the one-photon-forbidden excited states.

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Scitation: Continuous control of third-order optical nonlinearity in charge-transfer-type conjugated polymers
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/3/10.1063/1.2837643
10.1063/1.2837643
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