摘要:
An optical phase change medium comprises a substrate, an active layer having a crystalline and a liquid state, a dielectric layer and a reflective layer. The active layer is of a thickness which will transmit incident light. The dielectric layer is of a thickness such that light passing through the active layer is reflected by the reflective layer and destructively interferes with the incident light reflected directly off of the active layer, thereby causing the crystalline state of the active layer to absorb more light than the liquid state. The result is that the medium experiences reduced temperature during writing.
摘要:
An optical phase change medium (100) comprises a substrate (102), an active layer (104) having a crystalline and a liquid state, a dielectric layer (106) and a reflective layer (108). The active layer is of a thickness which will transmit incident light. The dielectric layer is of a thickness such that light passing through the active layer is reflected by the reflective layer and destructively interferes with the incident light reflected directly off of the active layer, thereby causing the crystalline state of the active layer to absorb more light than the liquid state. The result is that the medium experiences reduced temperature during writing.
摘要:
A method of optical recording uses a film of a material which has a crystallisation temperature between 100 DEG C and 400 DEG C and can be switched between the amorphous and the crystalline states. Both the amorphous and crystalline states are substantially a single phase where the stoichiometric ratio of the material remains unchanged. A spot on the film is heated with a laser beam with a controlled pulse duration and intensity to melt the material in the spot. When the laser irradiation is stopped, the material in that spot is quenched at a rate that produces the desired state, that is, either to the crystalline or the amorphous state.
摘要:
A method of optical recording uses a film of a material which has a crystallisation temperature between 100°C and 400°C and can be switched between the amorphous and the crystalline states. Both the amorphous and crystalline states are substantially a single phase where the stoichiometric ratio of the material remains unchanged. A spot on the film is heated with a laser beam with a controlled pulse duration and intensity to melt the material in the spot. When the laser irradiation is stopped, the material in that spot is quenched at a rate that produces the desired state, that is, either to the crystalline or the amorphous state.
摘要:
An optical phase change medium (100) comprises a substrate (102), an active layer (104) having a crystalline and a liquid state, a dielectric layer (106) and a reflective layer (108). The active layer is of a thickness which will transmit incident light. The dielectric layer is of a thickness such that light passing through the active layer is reflected by the reflective layer and destructively interferes with the incident light reflected directly off of the active layer, thereby causing the crystalline state of the active layer to absorb more light than the liquid state. The result is that the medium experiences reduced temperature during writing.
摘要:
An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.
摘要:
An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.