Quantum confinement and nonlinear optical response of conjugated molecules

Hong Xiang Wang; Akira Takahashi; M. Hartmann; Shaul Mukamel

doi:10.1117/12.148452

23 July 1993 Quantum confinement and nonlinear optical response of conjugated molecules

Hong Xiang Wang, Akira Takahashi, M. Hartmann, Shaul Mukamel

Proceedings Volume 1852, Nonlinear Optical Properties of Advanced Materials; (1993) https://doi.org/10.1117/12.148452
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

Citation Download Citation

Hong Xiang Wang, Akira Takahashi, M. Hartmann, and Shaul Mukamel "Quantum confinement and nonlinear optical response of conjugated molecules", Proc. SPIE 1852, Nonlinear Optical Properties of Advanced Materials, (23 July 1993); https://doi.org/10.1117/12.148452

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