Size Dependent Optical Nonlinearity and Optical Limiting Properties of Water Soluble CdSe Quantum Dots | Zendy

Anju K Augustine | Zendy; S. Mathew | Zendy; P. Radhakrishnan | Zendy; V. P. N. Nampoori | Zendy; M. Kailasnath | Zendy

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Size Dependent Optical Nonlinearity and Optical Limiting Properties of Water Soluble CdSe Quantum Dots

Author(s) -

Anju K Augustine,

S. Mathew,

P. Radhakrishnan,

V. P. N. Nampoori,

M. Kailasnath

Publication year - 2014

Publication title -

journal of nanoscience

Language(s) - English

Resource type - Journals

eISSN - 2356-749X

pISSN - 2314-6931

DOI - 10.1155/2014/623742

Subject(s) - quantum dot , materials science , saturable absorption , excitation , band gap , laser , saturation (graph theory) , absorption (acoustics) , optoelectronics , optics , physics , fiber laser , wavelength , mathematics , quantum mechanics , combinatorics , composite material

We present third-order optical nonlinear absorption in CdSe quantum dots (QDs) with particle sizes in the range of 4.16–5.25 nm which has been evaluated by the Z-scan technique. At an excitation irradiance of 0.54 GW/cm2 the CdSe QDs exhibit reverse saturation indicating a clear nonlinear behavior. Nonlinearity increases with particle size in CdSe QDs within the range of our investigations which in turn depends on the optical band gap. The optical limiting threshold of the QDs varies from 0.35 GW/cm2 to 0.57 GW/cm2 which makes CdSe QDs a promising candidate for reverse-saturable absorption based devices at high laser intensities such as optical limiters

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