Transformation of Sign of Nonlinear Refraction between Mo(W)/S/Cu Planar Metal Clusters
ZHANG Wang1, SONG Ying-Lin1, WANG Yu-xiao1, CHANG Qing2, ZHANG Chi3, XIN Xin-Quan3
1Department of Physics, Harbin Institute of Technology, Harbin 1500012College of Electronic Engineering, Heilongjiang University, Harbin 1500803State Key Laboratory of Coordination Chemistry, Department of Chemistry, Nanjing University, Nanjing 210093
Transformation of Sign of Nonlinear Refraction between Mo(W)/S/Cu Planar Metal Clusters
1Department of Physics, Harbin Institute of Technology, Harbin 1500012College of Electronic Engineering, Heilongjiang University, Harbin 1500803State Key Laboratory of Coordination Chemistry, Department of Chemistry, Nanjing University, Nanjing 210093
摘要Optical nonlinear refractive properties of a series of Mo(W)/S/Cu planar square clusters are investigated using the Z-scan technique with the ns laser pulses at the wavelength of 532nm. The result shows that the planar metal clusters containing the halogen ligands demonstrate the self-focusing effect, and the other planar metal clusters demonstrate the self-defocusing effect. These facts indicate that the halogen ligands can act as crucial factors in determining the sign of the nonlinear refraction of the Mo(W)/S/Cu planar metal clusters. The analysis of the experimental data shows that the planar clusters with halogen ligands possess greater refraction volume of the excited state than that of the ground state, while the other planar clusters possess the smaller refraction volume of the excited state than that of the ground state.
Abstract：Optical nonlinear refractive properties of a series of Mo(W)/S/Cu planar square clusters are investigated using the Z-scan technique with the ns laser pulses at the wavelength of 532nm. The result shows that the planar metal clusters containing the halogen ligands demonstrate the self-focusing effect, and the other planar metal clusters demonstrate the self-defocusing effect. These facts indicate that the halogen ligands can act as crucial factors in determining the sign of the nonlinear refraction of the Mo(W)/S/Cu planar metal clusters. The analysis of the experimental data shows that the planar clusters with halogen ligands possess greater refraction volume of the excited state than that of the ground state, while the other planar clusters possess the smaller refraction volume of the excited state than that of the ground state.
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2008, Vol. 25 
