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Optical Nonlinear Properties of CdSeS/ZnS Core/Shell Quantum Dots

Wu Feng1,2, Tian Wei1, Ma Li-Na1, Chen Wen-Ju1, Zhang Gui-Lan1, Zhao Guo-Feng3, Cao Shi-Dong3 and Xie Wei3

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The optical nonlinear properties of CdSeS/ZnS quantum dots (QDs) are investigated by Z-scan technique using fundamental harmonic generation (1064 nm) of mode-locked Nd:YAG laser for the first time. The experimental results show that two photon absorptions (TPA) occur at input intensity up to 12.5 GW/cm2. CdSeS/ZnS QDs have an average TPA cross section of 13710 GM and large nonlinear refractive index on order of 10-7 esu. The large optical nonlinearities perhaps allow the CdSeS/ZnS QDs to be one kind of candidate material for bioimaging and fluorescence label, optical limiting and all-optical switching.


PACS

78.67.Hc Quantum dots

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

78.55.Et II-VI semiconductors

Subjects

Condensed matter: electrical, magnetic and optical

Semiconductors

Nanoscale science and low-D systems

Dates

Issue 4 (April 2008)

Received 19 December 2007



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