Formation of photonic structures in Sm~(2+)-doped aluminosilicate glasses through phase separation

摘要

Sm~(2+)-doped Al_2O_3-SiO_2 glasses with three-dimensionally interconnected macroporous morphology have been prepared via the alkoxy-derived sol-gel process containing poly (ethylene oxide) and SmCl_3·6H_2O. The macro-porous morphology is obtained by concurrently inducing the phase separation and sol-gel transition. Using a visible laser with the wavelength of 488 nm, the valence state of Sm~(2+) has been manipulated spatially. When the photoionization of Sm~(2+) is combined with multiple light scattering in the porous glasses, holes are burned in wave-vector domain. The hole profile can be controlled by adjusting the macroporous morphology.