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Multiply-resonant nonlinear optical processes in doped polythiophenes
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Figures

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FIG. 1.

Head-to-tail regioregular P3HTs in (a) undoped and (b) doped state. In doped states with anions, the positive charge, and the unpaired electron occurs on the chain.

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FIG. 2.

Experimentally obtained THG spectrum for (a) undoped and (b) chemically doped P3HT (filled circles) is compared with the calculated one (dotted line). For comparison, the absorption spectra (solid line) are also depicted. For THG spectra, the left and upper axes are referred, and for absorption spectra the right and lower axes are referred.

Image of FIG. 3.

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FIG. 3.

Excited level structures. The shade denotes the width of each level.

Tables

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Table I.

Energies of excited states , damping energies , and transition dipole moments between the and state , which are obtained in the fitting calculation for the doped P3HT. In each parameter, the upper figures are obtained from absorption spectra and the lower from THG spectra.

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2010-09-08
2014-04-16

Abstract

We investigated the third-order optical nonlinearity in chemically doped poly(3-hexylthiophenes) by the third-harmonic generation (THG) method. The THG spectra reveal that the third-order optical nonlinearity is governed by the polaron states. The spectral analysis clarified the occurrence of multiple resonance related to transitions to the polaron states and the transition.

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Scitation: Multiply-resonant nonlinear optical processes in doped polythiophenes
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/10/10.1063/1.3486160
10.1063/1.3486160
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