Photo-induced transmittance in copper–selenide nanowires

Abstract Photo-induced transmission was investigated in Cu1.7Se nanowires electrochemically deposited in alumina matrix pores with a central channel of the diameters of 12, 15 and 60 nm by means of the degenerate picosecond pump–probe technique at 1.064 μm wavelength. Resonant excitation intensity dependencies were interpreted. Absorption saturation was ascertained as a result of the drain of acceptor shallow centers. The estimated absorption cross-section was 10−12 cm2, saturation intensity – was 1–10 mJ cm−2.