采用不同中间夹层的双记录层磁光光盘热光特性比较

磁光存储技术是一种颇受关注的下一代光存储技术.为提高单个磁光光盘的存储容量,途径之一是采用多值存储、多波长读出技术,实现所谓三维磁光存储.通常使用不同波长的蓝光来实现信号的读写操作.如果不同波长的激光在磁光存储多层膜中产生热场分布的差异较大,将有利于提高读出信号的信噪比.本文结合光学矩阵法及有限元方法分析了中间夹层分别为SiN、GaP时,磁光存储多层膜的热光特性.结果表明在蓝光波段,用GaP层替代传统的SiN中间夹层,将使磁光光盘具有更好的热光特性.

COMPARISON OF THE OPTICAL AND THERMAL CHARACTERISTICS OF A DOUBLE-RECORDING-LAYERED MAGNETO-OPTICAL DISK WITH DIFFERENT INTERLAYERS

Magneto-optical(MO) storage is an attractive technology for next generation storage.In order to increase the capacity of storage in a single disk,one of the approaches is applying the multi-valued recording and multi-wavelength readout technique,i.e.,so called 3-dimensional(3-D) MO storage.Lasers of different wavelengths are used to read or write data on different recording layers.The difference in the temperature profiles of this kind of MO disk caused by different lasers is expected to be large enough for improving the signal to noise ratio(SNR).In this study,optical matrix method and finite element method were applied to analyze the thermal and magneto-optical responses for a 3-D MO disk.The results show that the MO disk with GaP as interlayers has a potential in improving the thermal and optical performance at two blue wavelengths compared with the MO disk with SiN interlayers.