Size dependence of nonlinear optical absorption and refraction of Mn-doped ZnSe nanocrystals
by Gan, C. L.; Xiao, M.; Battaglia, D.; Pradhan, N.; Peng, X. G.
Nonlinear refractive index and nonlinear absorption coefficient of high-quality Mn:ZnSe nanocrystals are measured by z-scan technique at 800 nm wavelength. The synthesized nanocrystals with nucleation doping have tunable wavelength (between 565-610 nm), high quantum yield (similar to 50%), and high thermal as well as photochemical stabilities. The unique nanocrystal structure (with a MnSe core, Zn1-xMnxSe diffusion region, and an outer ZnSe layer) shows size-dependent nonlinear effects, which can be qualitatively explained by a simple model using crystal field. Studies of nonlinear optical properties are very important and necessary for high-power optical applications (such as light-emitting diodes and lasers) of such Mn-doped ZnSe nanocrystals.
- Journal
- Applied Physics Letters
- Volume
- 91
- Issue
- 20
- Year
- 2007
- URL
- https://dx.doi.org/10.1063/1.2811713
- ISBN/ISSN
- 1077-3118; 0003-6951
- DOI
- 10.1063/1.2811713