Third order optical nonlinearity investigation of germanium quantum dots embedded in silica matrix

The third-order optical nonlinear properties of CdSe quantum dots (QDs) and CdSe - C 60 QDs are investigated by Z-scan technique with picosecond pulses at the wavelength of 800 nm. The value of the nonlinear absorption coefficient β of CdSe - C 60 QDs is measured to be 2.9 cm/GW, which is about two times larger than that of CdSe QDs. The nonlinear refraction index γ of CdSe - C 60 QDs is -2.8 × 10-3 cm 2/ GW , which is about seven times larger than that of CdSe QDs. Presence of C 60 contributes to the larger optical nonlinearity of CdSe - C 60 QDs comparing with CdSe QDs.

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Preparation and Third-Order Optical Nonlinearity of Self-Assembled Chitosan/CdSe−ZnS Core−Shell Quantum Dots Multilayer Films

The Journal of Physical Chemistry B ◽

10.1021/jp055916c ◽

2006 ◽

Vol 110 (4) ◽

pp. 1566-1570 ◽

Cited By ~ 80

Author(s):

Xiaohui Wang ◽

Yumin Du ◽

Sha Ding ◽

Ququan Wang ◽

Guiguang Xiong ◽

...

Keyword(s):

Quantum Dots ◽

Optical Nonlinearity ◽

Multilayer Films ◽

Core Shell ◽

Third Order ◽

Self Assembled

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The third-order optical nonlinearity and upconversion luminescence of CdTe quantum dots under femtosecond laser excitation

Journal of Nanoparticle Research ◽

10.1007/s11051-008-9416-x ◽

2008 ◽

Vol 11 (3) ◽

pp. 665-670 ◽

Cited By ~ 9

Author(s):

Qinhan Jin ◽

Wenzhi Wu ◽

Zhiren Zheng ◽

Yuxi Yan ◽

Weilong Liu ◽

...

Keyword(s):

Quantum Dots ◽

Femtosecond Laser ◽

Laser Excitation ◽

Upconversion Luminescence ◽

Optical Nonlinearity ◽

Cdte Quantum Dots ◽

Third Order ◽

The Third

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Experimental observation of the magnitude and sign of the third order optical nonlinearity in CdS quantum dots in a dendrimer matrix

2005 Quantum Electronics and Laser Science Conference ◽

10.1109/qels.2005.1549102 ◽

2005 ◽

Author(s):

M. Etienne ◽

A.D. Walser ◽

R. Dorsinville ◽

D.L.V. Bauer ◽

V. Balogh-Nair

Keyword(s):

Quantum Dots ◽

Experimental Observation ◽

Optical Nonlinearity ◽

Cds Quantum Dots ◽

Third Order ◽

The Third

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Study of optical nonlinearity of CdSe and CdSe@ZnO core–shell quantum dots in nanosecond regime

Modern Physics Letters B ◽

10.1142/s0217984915502097 ◽

2015 ◽

Vol 29 (33) ◽

pp. 1550209 ◽

Cited By ~ 3

Author(s):

Deepika ◽

Rakesh Dhar ◽

Devendra Mohan

Keyword(s):

Quantum Dots ◽

Thioglycolic Acid ◽

Second Harmonic ◽

Optical Nonlinearity ◽

Index Formula ◽

Core Shell ◽

Optical Parameters ◽

Strong Nonlinearity ◽

Third Order ◽

Optical Limiter

Thioglycolic acid capped cadmium selenide (CdSe) and CdSe@ZnO core–shell quantum dots have been synthesized in aqueous phase. The sample was characterized by UV-vis spectrophotometer, TEM and Z-scan technique. The nonlinear optical parameters viz. nonlinear absorption coefficient [Formula: see text], nonlinear refractive index [Formula: see text] and third-order nonlinear susceptibilities [Formula: see text] of quantum dots have been estimated using second harmonic of Nd:YAG laser. The study predicts that CdSe@ZnO quantum dots exhibits strong nonlinearity as compared to core CdSe quantum dots. The nonlinearity in quantum dots is attributed to the presence of resonant excitation and free optical processes. The presence of RSA in these nanoparticles makes them a potential material for the development of optical limiter.

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