Nonlinear optical properties of CdTe nanocrystals synthesized by a green room temperature solution method

• Published in: Applied physics. B, Lasers and optics Lasers and optics, 2015-03, Vol.118 (4), p.567-572
• Main Authors: Majles Ara, M. H., Moslemi, Z., Naderi, H., Mihandoost, A., Daneshfar, A., Sahraei, R.
• Format: Article
• Language: English
• Subjects: Engineering; Lasers; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Quantum Optics
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-015-6040-1

The CdTe nanocrystals were successfully synthesized using a facile room temperature method with non-toxic and environmentally friendly capping agent. The obtained CdTe nanocrystals were characterized by UV–Vis absorption spectroscopy, transmission electron microscopy, and z-scan technique. A photoluminescence peak with full width at half maximum of around 15 nm could be obtained, which indicates a homogeneous and narrow size distribution for the CdTe nanocrystals. The magnitude and sign of the third-order nonlinear refractive index ( n 2 ) and nonlinear absorption coefficient ( β ) of the CdTe nanocrystals were determined by using of the closed- and open-aperture z-scan at different intensities, respectively. The negative sign of n 2 indicated that there is a self-defocusing effect in the sample. The nonlinear refractive index, n 2 , and the nonlinear absorption coefficient, β , were in order of 10 −7  cm 2 W −1 and 10 −2 –10 −3  cmW −1 , respectively.