Organic electrooptical （EO） chromophores are now gaining more attention because the property of organic photorefrative （PR） materials could be controlled by doped EO chromophores. In this paper, nonlinear optical ...Organic electrooptical （EO） chromophores are now gaining more attention because the property of organic photorefrative （PR） materials could be controlled by doped EO chromophores. In this paper, nonlinear optical （NLO） properties of a new group of organic electrooptical chromophores, synthesized recently in our laboratory, were elucidated theoretically with the quantum chemical density functional theory （DFT） and the intermediate neglect of differential overlap Hamilton and the configuration interaction （INDO/CI）, as well as semiemperical Austin Model 1 （AM1） methods. The electronic transition intensity, dipole moment and the second-order polarizability were obtained. The results show this group of chromophores possess appropriate optical absorption property and good electrooptical property and optical activity. The second-order polarizabilities β are as large as the order of 10-29 to 10-28 ESU, indicating the promising applications in the future. The physical mechanism of NLO is discussed by means of molecular orbital and electronic charge distribution.展开更多
Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve op...Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve optical switch.At present,the mechanism of SPPM is still ambiguous.The debate mainly focuses on whether the phenomenon is caused by the nonlinear refractive index of the two-dimensional material or the thermal effect of the laser.The lack of theory limits the dimension of the phase modulation to the radius of the diffraction ring and the vertical imbalance.Therefore,it is urgent to establish a unified and universal SSPM theoretical system of two-dimensional material.展开更多
文摘Organic electrooptical （EO） chromophores are now gaining more attention because the property of organic photorefrative （PR） materials could be controlled by doped EO chromophores. In this paper, nonlinear optical （NLO） properties of a new group of organic electrooptical chromophores, synthesized recently in our laboratory, were elucidated theoretically with the quantum chemical density functional theory （DFT） and the intermediate neglect of differential overlap Hamilton and the configuration interaction （INDO/CI）, as well as semiemperical Austin Model 1 （AM1） methods. The electronic transition intensity, dipole moment and the second-order polarizability were obtained. The results show this group of chromophores possess appropriate optical absorption property and good electrooptical property and optical activity. The second-order polarizabilities β are as large as the order of 10-29 to 10-28 ESU, indicating the promising applications in the future. The physical mechanism of NLO is discussed by means of molecular orbital and electronic charge distribution.
基金Project(6187031976)supported by the National Natural Science Foundation of China
文摘Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve optical switch.At present,the mechanism of SPPM is still ambiguous.The debate mainly focuses on whether the phenomenon is caused by the nonlinear refractive index of the two-dimensional material or the thermal effect of the laser.The lack of theory limits the dimension of the phase modulation to the radius of the diffraction ring and the vertical imbalance.Therefore,it is urgent to establish a unified and universal SSPM theoretical system of two-dimensional material.
