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To estimate the potential for third-order nonlinear optical (NLO) properties of the title azobenzene polymers, the one-photon absorption (OPA) and two-photon absorption (TPA) characterizations have been determined by configuration interaction (CI) and time-dependent Hartree-Fock (TDHF) methods, respectively. The nonlinear absorption parameters (β) and third-order susceptibilities (χ(3)) have been...
During the last years there is a growing effort in order to synthesize, functionalize and characterize modern molecular systems, which will have enhanced nonlinearities in order to be utilized in modern photonic applications[1]–[3]. The nonlinearities are generally known to be significantly enhanced in systems which exhibit strong charge transfer within specially chosen moieties acting as electron...
The non-linear optical properties of π-conjugated organic molecules such as TTF and their derivatives have recently gained particular interest due to their extended p-system and the strong electron donating character. The knowledge of the nonlinear optical response, as well as the impact of the charge transfer on the nonlinearity is very important. As such systems can be used in a variety of applications...
(Zr -Li) codoped ZnO thin films were grown on heated glass substrates at 450°C by reactive chemical pulverization spray pyrolysis technique. The effect of lithium on the structural, morphological and the nonlinear optical properties of ZnO:Zr thin films was investigated. The X-ray diffraction patterns reveal that the ZnO:(Zr-Li) thin films are polycrystalline in nature, fitting well with a hegxagonal...
In this paper, we investigate NLO properties of ZnO nanostructures for optoelectronics applications. It is shown that carefully designed and fabricated nanostructured ZnO films posses some advantageous for practical use and to generate more and short wavelengths and, when combined with TiO2, produce a core-shell structure that reduces the combination rate. The limitations of ZnO-based DSCs are also...
Laser ablation is the process of removing material from a solid surface by irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or sublimates. At high laser flux, the material is typically converted to a plasma. Usually, laser ablation refers to removing material with a pulsed laser, that's why is also called pulsed laser deposition...
In this work are reported some new azo- functionalized azulene derivatives of nonlinear optical properties (NLO). They were studied using standard methods like degenerate four wave mixing, second - and third harmonic generation and nonlinear optical absorption. The obtained results let to conclude that NLO properties of azulene molecule can be significantly enhanced by substitution with electron accepting...
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