| 摘要 |
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 being a specific volume and/or a thermal expansion coefficient of said transition material ( 21 ) below a transition temperature (T<SUB>g</SUB>, T<SUB>m</SUB>) and a second value of said material characteristic above said transition temperature (T<SUB>g</SUB>, T<SUB>m</SUB>), said second value being higher than said first value. |
