Nonadiabatic multi-step excitation for the blue–green light emission from dye grains induced by the near-infrared optical near-field

被引:0
|
作者
H. Fujiwara
T. Kawazoe
M. Ohtsu
机构
[1] Hamamatsu Photonics K.K.,Central Research Laboratories
[2] The University of Tokyo,Department of Electrical Engineering and Information Systems, Graduate School of Engineering
[3] The University of Tokyo,Nanophotonics Research Center, Graduate School of Engineering
来源
Applied Physics B | 2010年 / 98卷
关键词
78.67.-n; 78.47.J-; 33.80.Wz;
D O I
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学科分类号
摘要
Blue–green light emission (wavelength range: 460–520 nm) from coumarin dye grains due to near-infrared excitation (CW, λex=808 nm), based on the nonadiabatic excitation process induced by an optical near-field, was observed. A maximum frequency up-shift of 1.17 eV was confirmed. Based on the excitation intensity dependence, a light emission mechanism originating from a nonadiabatic three-step excitation was confirmed for the first time. The lifetime of the intermediate excited state was approximately 1.1–1.9 ps, and thus realization of frequency up-conversion with a rapid response can be expected.
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页码:283 / 289
页数:6
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