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Proceedings Paper

Quantum confinement and nonlinear optical response of conjugated molecules
Author(s): Hong Xiang Wang; Akira Takahashi; M. Hartmann; Shaul Mukamel
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Paper Abstract

The nonlinear optical response (NLO) of linear polyenes and fullerenes is studied using an anharmonic oscillator model. The influence of size effects and quantum exciton confinement on the nonlinear optical response is examined, and the time evolution of the excitons is studied. The elementary optical excitations for C60 are shown to be correlated charge density fluctuations. For linear polyenes with finite size, oscillations in the time-resolved degenerated four wave mixing (D4WM) signal due to the coherent excitation of several band states are found within the Huckel model (no Coulomb interaction). For infinite size a photon echo like behavior is obtained. The exciton-exciton interaction changes the lineshape of the D4WM signal and gives rise to a broad delayed signal whose position is given by the dephasing time of the system.

Paper Details

Date Published: 23 July 1993
PDF: 12 pages
Proc. SPIE 1852, Nonlinear Optical Properties of Advanced Materials, (23 July 1993); doi: 10.1117/12.148452
Show Author Affiliations
Hong Xiang Wang, Univ. of Rochester (United States)
Akira Takahashi, Univ. of Rochester (United States)
M. Hartmann, Univ. of Rochester (United States)
Shaul Mukamel, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 1852:
Nonlinear Optical Properties of Advanced Materials
Shahab Etemad, Editor(s)

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