Micrometer-scale gold nanoplates have been synthesized in high yield through a polyol process.The morphology,crystal structure and linear optical extinction of the gold nanoplates have been characterized.These gold na...Micrometer-scale gold nanoplates have been synthesized in high yield through a polyol process.The morphology,crystal structure and linear optical extinction of the gold nanoplates have been characterized.These gold nanoplates are single-crystalline with triangular,truncated triangular and hexagonal shapes,exhibiting strong surface plasmon resonance(SPR)extinction in the visible and near-infrared(NIR)region.The linear optical properties of gold nanoplates are also investigated by theoretical calculations.We further investigate the nonlinear optical properties of the gold nanoplates in solution by Z-scan technique.The nonlinear absorption(NLA)coefficient and nonlinear refraction(NLR)index are measured to be 1.18×10^(2)cm/GW and-1.04×10^(-3)cm^(2)/GW,respectively.展开更多
The concentration dependence of the fluorescence spectra and lifetimes of chlorophyll𝑏and sodium magnesium chlorophyllin are compared to explore the influences of intramolecular relaxation and intermolecular i...The concentration dependence of the fluorescence spectra and lifetimes of chlorophyll𝑏and sodium magnesium chlorophyllin are compared to explore the influences of intramolecular relaxation and intermolecular interaction of chlorophylls on the fluorescence dynamics.With different concentrations of chlorophyll𝑏and sodium magnesium chlorophyllin in the suspensions,three different fluorescence emission bands are observed.Intermolecular inter-actions increase as the concentrations increase,which lead to redshifts in both fluorescence and lifetime spectra.Additionally,the lifetime is increased by re-absorption in the sodium magnesium chlorophyllin suspensions.These observations increase the understanding of the light harvesting and energy relaxation mechanisms of chlorophyll molecules.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 61008043 and 10874134the National Program on Key Science Research(No 2007CB935300)the Fundamental Research Funds for the Central Universities(Nos 1101024 and 20102020101000025).
文摘Micrometer-scale gold nanoplates have been synthesized in high yield through a polyol process.The morphology,crystal structure and linear optical extinction of the gold nanoplates have been characterized.These gold nanoplates are single-crystalline with triangular,truncated triangular and hexagonal shapes,exhibiting strong surface plasmon resonance(SPR)extinction in the visible and near-infrared(NIR)region.The linear optical properties of gold nanoplates are also investigated by theoretical calculations.We further investigate the nonlinear optical properties of the gold nanoplates in solution by Z-scan technique.The nonlinear absorption(NLA)coefficient and nonlinear refraction(NLR)index are measured to be 1.18×10^(2)cm/GW and-1.04×10^(-3)cm^(2)/GW,respectively.
基金Supported by the National Natural Science Foundation of China(11174229,61008043 and 11204221)Specialized Research Fund for the Doctoral Program of Higher Education of China(20100141120041).
文摘The concentration dependence of the fluorescence spectra and lifetimes of chlorophyll𝑏and sodium magnesium chlorophyllin are compared to explore the influences of intramolecular relaxation and intermolecular interaction of chlorophylls on the fluorescence dynamics.With different concentrations of chlorophyll𝑏and sodium magnesium chlorophyllin in the suspensions,three different fluorescence emission bands are observed.Intermolecular inter-actions increase as the concentrations increase,which lead to redshifts in both fluorescence and lifetime spectra.Additionally,the lifetime is increased by re-absorption in the sodium magnesium chlorophyllin suspensions.These observations increase the understanding of the light harvesting and energy relaxation mechanisms of chlorophyll molecules.
