Journal
MATERIALS
Volume 10, Issue 1, Pages -Publisher
MDPI AG
DOI: 10.3390/ma10010070
Keywords
two-photon absorption; optical limiting; rate equations-field intensity equation
Categories
Funding
- National Natural Science Foundation of China [11247307, 11304172, 11304186]
- Shandong Province Program on Key Research Projects [2015GGX101017]
- Excellent Young Scholars Research Fund of Shandong Normal University
- Shandong Province Higher Educational Science and Technology Program [J12LJ04]
- International Cooperation Program for Key Professors by Shandong Provincial Education Department
- Subject Construction Funds of Qilu University of Technology
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Nonlinear optical properties of a series of newly-synthesized ladder-type chromophores containing oligo-p-phenylene moiety with different pi-conjugated lengths were theoretically studied by numerically solving the rate equations and the field intensity equation with an iterative predictor-corrector finite-difference time-domain technique. Ab initio calculation results show that the compounds can be described by the three-level model. Based on the two-photon absorption mechanism, highly efficient optical limiting performances are demonstrated in the chromophores, which strongly depend on the pi-conjugated length of the molecule. Special attention has been paid to the dynamical two-photon absorption, indicating that the parameter of the medium can affect the dynamical two-photon absorption cross section. Our numerical results agree well with the experimental measurements. It reveals that the increase in the pi-conjugated length of ladder-type oligo-p-phenylene for these chromophores leads to enhanced nonlinear optical absorption. The results also provide a method to modulate the optical limiting and dynamical two-photon absorption of the compounds by changing the molecular density and thickness of the absorber.
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