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

The self-assembed chitosan CdSe quantum dots (QDs) and chitosan CdSe−ZnS core−shell QDs films have been prepared by using layer-by-layer electrostatic technique. The well-ordered nanostructure and the layer-by-layer deposition of the QDs are revealed by AFM and exciton absorption spectra, respectively. The optical nonlinearity of the composite films were studied by using Z-scan technique with femtosecond pulses at the wavelength of 790 nm, the value of third-order susceptibility of core−shell QDs are measured to be about 1.1 × 10-8 esu, which is about 200% larger than that of CdSe QDs of 5.3 × 10-9 esu. This has potential applications in all-optical switches in optical information processing. [ABSTRACT FROM AUTHOR]