ORGANOMETALLIC CHEMICAL-VAPOR-DEPOSITION AND CHARACTERIZATION OF INDIUM-PHOSPHIDE NANOCRYSTALS IN VYCOR POROUS-GLASS

Indium phosphide has been deposited in 40 and 150 angstrom Vycor porou s glass by the reaction of trimethylindium with excess PH3. X-ray diff raction (XRD) of the red, transparent samples confirms the presence of crystalline indium phosphide. The amount of III-V material deposited within the glass matrix (loading) and annealing conditions influence t he crystallinity and particle size of the nanocrystallites. The absorp tion spectra of vacuum-annealed samples is blue shifted with respect t o bulk InP, with maxima ranging from 500 to 700 nm for both the 40 and 150 angstrom samples and is consistent with size quantization. The no nlinear optical properties of these nanocrystallite composites have be en evaluated by Z-scan measurements and are characterized by a defocus ing refractive nonlinearity influenced by a substantial nonlinear loss presumed to be caused by two-photon absorption.