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Proceedings Paper

Organic semiconductor-doped polymer glasses as novel nonlinear media
Author(s): Graham Hugh Cross; M. Carroll; Tony L. Axon; David Bloor; Raul Rangel-Rojo; Ajoy Kumar Kar; Brian S. Wherrett
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Paper Abstract

Polymeric composites containing microcrystals of 1:1 salts of tetracyano-p-quinodimethane, TCNQ, have been prepared. Re-crystallization of these organic one-dimensional semiconductors in-situ by either heat treatment or exposure to vapor yields uniform dispersions of crystallites of sub-optical dimensions. We report a strong dependence of the lowest energy electronic absorption band in the lithium and potassium TCNQ salt with crystallite size. The inter-molecular charge transfer band shows a shift of up to 0.5 eV between films where the crystallite size is a few microns and those where crystals cannot be observed optically. The non-linear refraction of a heat treated film containing TEA(direct sum)(TCNQ) (TEA(direct sum) - triethylammonium) is reported. (chi) (3) at 712 nm is 2.69 X 10-10 esu and is found to be a bleaching resonant non-linearity.

Paper Details

Date Published: 25 February 1993
PDF: 10 pages
Proc. SPIE 1775, Nonlinear Optical Properties of Organic Materials V, (25 February 1993); doi: 10.1117/12.139226
Show Author Affiliations
Graham Hugh Cross, Univ. of Durham (United Kingdom)
M. Carroll, Univ. of Durham (United Kingdom)
Tony L. Axon, Univ. of Durham (United Kingdom)
David Bloor, Univ. of Durham (United Kingdom)
Raul Rangel-Rojo, Heriot-Watt Univ. (United Kingdom)
Ajoy Kumar Kar, Heriot-Watt Univ. (United Kingdom)
Brian S. Wherrett, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 1775:
Nonlinear Optical Properties of Organic Materials V
David J. Williams, Editor(s)

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