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Proceedings Paper

Nonlinear optical changes in the complex index of refraction in conducting polymer-methanofullerene films evaluated by photoexcitation spectroscopy
Author(s): Kwanghee Lee; Edward Kirk Miller; Niyazi Serdar Sariciftci; Jan C. Hummelen; Fred Wudl; Alan J. Heeger
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Paper Abstract

We report photoinduced absorption and photoinduced reflectance spectra of poly(3-octyl thiophene)- methanofullerene films. The data allow direct evaluation of the corresponding changes in the complex refractive index, (Delta) N equals (Delta) n((omega) )+i(Delta) (kappa) ((omega) ), of the films. As a results of the efficient photoinduced intermolecular charge transfer, the magnitudes of (Delta) n((omega) ) and (Delta) (kappa) ((omega) ) are significantly enhanced over those in either of the component materials, with (Delta) n and (Delta) (kappa) approximately equals 10-2 in the infrared at laser pump intensity of only 50mW/cm2. Moreover, the photoinduced absorption shows new features at 1.2 eV and 1.6 eV, both of which are associated with excited state absorptions of the methanofullerene anion. The implications of these photoinduced changes in the index resulting from photoexcitations are discussed in terms of potential optoelectronic and nonlinear optical applications of these materials, indicating that conducting polymer/methanofullerene films are promising as high- performance nonlinear optical materials.

Paper Details

Date Published: 16 December 1996
PDF: 9 pages
Proc. SPIE 2854, Fullerenes and Photonics III, (16 December 1996); doi: 10.1117/12.262991
Show Author Affiliations
Kwanghee Lee, Univ. of California/Santa Barbara (United States)
Edward Kirk Miller, Univ. of California/Santa Barbara (United States)
Niyazi Serdar Sariciftci, Univ. of California/Santa Barbara (United States)
Jan C. Hummelen, Univ. of California/Santa Barbara (United States)
Fred Wudl, Univ. of California/Santa Barbara (United States)
Alan J. Heeger, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 2854:
Fullerenes and Photonics III
Zakya H. Kafafi, Editor(s)

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