| 摘要 |
<p>The invention relates to an optical data carrier (1, 10) comprising a thermochromic layer (4, 11, 20) including a dielectric transition material (21) and metal nano-particles(22) embedded in said transition material (21) for absorbing at least a part of an irradiation (3) applied to said optical data carrier (1, 10) for reading out data from said optical data carrier (1,10) and/or for recording data on said optical data carrier (1, 10). The invention further relates to an optical master (30)for manufacturing an optical data carrier, said optical master (30) comprising such a thermochromic layer (20, 32). In order to provide an optical data carrier(1, 10) or an optical master (30) with a thermochromic material which allows a choosing of the position of the absorption band and of the temperature at which a thermochromic effect takes place and which is further sufficiently fast and stable, it is proposed that said transition material (21) has a first value of a material characteristic be ing a specific volume and/or a thermal expansion coefficient of said transition material (21) below a transition temperature(Tg, Tm) and a second value of said material characteristic above said transition temperature (Tg, Tm), said second value being higher than said first value.</p> |
