M41S materials having nonlinear optical properties

A composition exhibiting third order nonlinear optical properties, comprising:

• a host material comprising an inorganic, porous, non-layered crystalline phase material exhibiting, after calcination, an arrangement of uniformly sized pores adapted in size, shape and chemical stereospecificity to fix an inorganic, semiconducting guest material therein in an arrangement to provide nonlinear optical properties, said pores having diameters of at least about 13 Angstrom units, said phase material exhibiting an X-ray diffraction pattern with at least one peak at a position greater than about 18 Angstrom units d-spacing and exhibiting a benzene adsorption capacity of greater than about 15 grams benzene per 100 grams of said phase material at 50 torr and 25.degree. C., and
• quantum size clusters of said guest material incorporated into the pores of said host material.