Patent ID: 6670016
Filing Date: 2003-12-30
Classification: C04B,G11B,Y10T

Abstract:
A super-resolution composite material for a high density optical information recording medium comprising a dielectric medium transparent at a wavelength of a laser beam in use, said dielectric medium having a melting point above 800Â° C. and being at least one material selected from the group consisting of SiO2, TiO2, ZrO2, HfO2, Al2O3, ZnO, Y2O3, BeO, MgO, WO3, V2O3, SiN, AlN, ZnS, CdS, SiC, MgF, CaF2, NaF, BaF2, LiF, LaF3 and GaP; and metal particles dispersed therein, said metal particles having melting points of about 150Â° to about 450Â° C., wherein said metal particles are at least one material selected from the group consisting of Sn, Pb, Bi, Te, Zn, Cd, Se, Tl, and Po, said composite material when irradiated by said laser beam comprises molten regions of said metal particles and a solid phase region of said dielectric medium in an area where temperatures exceed said melting points of said metal particles, each of said molten regions being restored to a solid state as said laser beam moves away from said irradiated area.