SPECTRAL HOLE-BURNING IN EU3-DOPED HIGHLY POROUS GAMMA-ALUMINUM OXIDE()

Transient and persistent spectral holes were burned in the F-7(0)-D-5( 0) transition of Eu3+ ions in macromonolithic transparent porous nanoc rystalline gamma-Al2O3 produced by sol-gel technology. An unusual temp erature dependence of the transient hole width was observed that diffe rs markedly from that in either crystalline or disordered systems. Thi s temperature dependence is explained in terms of Raman processes invo lving size-resonant vibrations of the nanoparticles comprising the str ucture. Possible mechanisms of hole burning are suggested.