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

作者：Ara M H Majles^*; Moslemi Z; Naderi H; Mihandoost A; Daneshfar A; Sahraei R

来源：Applied Physics B: Lasers and Optics , 2015, 118(4): 567-572.

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 (beta) 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, beta, were in order of 10(-7) cm(2)W(-1) and 10(-2)-10(-3) cmW(-1), respectively.

• 出版日期2015-3