Nonlinear optical properties of thiol-capped CdTe quantum dots in nonresonant region
Nonlinear optical properties of thiol-capped CdTe quantum dots in nonresonant region
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DOI：
10.1063/1.2761494
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发表时间：
2007-07-30
影响因子：
4
通讯作者：
Deki, Shigehito
中科院分区：
文献类型：
--
作者：
Pan, Lingyun;Tamai, Naoto;Deki, Shigehito
通过Z扫描和简并四波混频实验研究了水溶性巯基封端的CdTe量子点在非共振区的chi（3）随尺寸的变化。对于4.9nm的CdTe量子点，观察到高达10（4）GM的双光子吸收截面。chi（3）的虚部和真实的部都随量子点尺寸的增大而增大。在非共振激发下，3.1nm CdTe量子点的非线性优值由Re chi（（3））（QD）/Im chi（（3））（QD）定义，与体材料CdTe相比提高了30倍。(c)2007年，美国物理学会。
Size-dependent chi((3)) of water-soluble thiol-capped CdTe quantum dots (QDs) in nonresonant region has been examined by Z-scan and degenerate four-wave mixing experiments. Two-photon absorption cross section as high as 10(4) GM was observed for 4.9 nm sized CdTe QDs. Both imaginary and real parts of chi((3)) were found to increase with QD size. Compared with the bulk CdTe semiconductor, 30 times enhancement of nonlinear figures of merit defined by Re chi((3))(QD)/Im chi((3))(QD) was found for 3.1 nm CdTe QDs in nonresonant excitation. (c) 2007 American Institute of Physics.