Two-photon resonant hyperpolarizability of an H-shaped molecule studied by wavelength-tunable hyper-Rayleigh scattering

被引:9
作者
Zhu, Jing [1 ]
Lu, Changgui [1 ]
Cui, Yiping [1 ]
Zhang, Chaozhi [2 ]
Lu, Guoyuan [2 ]
机构
[1] Southeast Univ, Adv Photon Ctr, Nanjing 210096, Peoples R China
[2] Nanjing Univ, State Key Lab Coordinat Chem, Dept Chem, Nanjing 210093, Peoples R China
关键词
NONLINEAR-OPTICAL PROPERTIES; HIGH-FREQUENCY DEMODULATION; CHARGE-TRANSFER CHROMOPHORE; RAMAN EXCITATION PROFILES; 1ST HYPERPOLARIZABILITY; LIGHT-SCATTERING; MULTIPHOTON FLUORESCENCE; CORRELATED CHROMOPHORES; PARA-NITROANILINE; ONE-PHOTON;
D O I
10.1063/1.3506421
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Wavelength dependent hyper-Rayleigh scattering measurements have been performed by using a fluorescence spectrometer. With this detection strategy, first molecular hyperpolarizability (beta) of a dual charge-transfer (H-shaped) chromophore and its monomer have been measured in two-photon resonance range from 670 to 950 nm as well as at off-resonance of 1064 nm. The absorption and resonance hyper-Rayleigh profiles can be simulated reasonably well with a common set of parameters. In addition, both resonance and off-resonance results show that beta(0) per chromophore has a remarkable enhancement for the H-shaped molecule as large as 1.7, compared with that of the monomer, which could be ascribed to two physical effects: (1) coherent enhancement of two chromophores and (2) intramolecular dipole-dipole interaction, which was confirmed by their fluorescence-decay behaviors. (C) 2010 American Institute of Physics. [doi:10.1063/1.3506421]
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页数:7
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