Abstract

Picosecond laser pump and probe spectroscopy method has been utilized to investigate nonlinear optical properties of semiconductor quantum wires (QWrs). Nonlinear optical transmission at discrete frequencies (bleaching bands) has been observed for the first time in GaAs and CdSe QWrs crystallized in chrysotile asbestos nanotubes with average diameter ≈ 6 nm and in quantum wires and dots of CdS crystallized in the transparent molecular filter (mica with through empty channels). The induced decrease of absorption has been explained by filling of the size – quantized energy bands of QWrs with nonequilibrium carriers (saturation effect).

© 1996 IEEE