Nonlinear optical study of quasi‐one‐dimensional platinum complexes: Two‐photon excitonic resonance effect
Nonlinear optical study of quasi‐one‐dimensional platinum complexes: Two‐photon excitonic resonance effect
复制标题
准一维铂配合物的非线性光学研究：双光子激子共振效应
DOI：
10.1063/1.106075
复制
发表时间：
1991
影响因子：
4
通讯作者：
M. Yamashita
中科院分区：
文献类型：
--
作者：
Y. Iwasa;E. Funatsu;T. Hasegawa;T. Koda;M. Yamashita
在0.6~1.0μm的抽运波长范围内，首次测量了卤桥联混价铂配合物取向膜的三次谐波产生，用Maker条纹法测得的‖χ(3)(−3ω；ω，ω，ω)‖)谱在约1.8 eV处有一个明显的峰，峰值约为4×10−11esu。通过与电吸收数据的比较，确定该峰为双光子共振峰，并含有铂-卤素链中的禁戒激子。与共轭聚合物中的情况类似，该化合物中的一维激子态在三阶光学非线性中起着重要的作用。
Third‐harmonic generation measurements have been made for the first time on oriented films of halogen‐bridged mixed‐valence platinum complexes for the pump wavelength region from 0.6 to 1.0 μm. The ‖χ(3)(−3ω;ω,ω,ω)‖ spectra obtained by the Maker’s fringe method show a distinct peak at about 1.8 eV with the peak value of about 4×10−11 esu. From comparison with the electroabsorption data, this peak has been identified with the two‐photon resonance peak with the forbidden exciton in the Pt‐halogen chains. One‐dimensional exciton states in this compound take an important role in the third‐order optical nonlinearity, similar to the case in conjugated polymers.