Four different states of Si15Sb85 and Ge2Sb2Te5 phase change memory thin films are obtained by crystallization degree modulation through laser initialization at different powers or annealing at different temperatures....Four different states of Si15Sb85 and Ge2Sb2Te5 phase change memory thin films are obtained by crystallization degree modulation through laser initialization at different powers or annealing at different temperatures. The polarization characteristics of these two four-level phase change recording media are analyzed systematically. A simple and effective readout scheme is then proposed, and the readout signal is numerically simulated. The results show that a high-contrast polarization readout can be obtained in an extensive wavelength range for the four-level phase change recording media using common phase change materials. This study will help in-depth understanding of the physical mechanisms and provide technical approaches to multilevel phase change recording.展开更多
On January 27, 2012, So Chung, a Tibetan jour- nalist with Lhasa-based Tibet.cn was sent to thehospital due to a hypokalemia attack on his way to take photos in the coun- tryside during the Spring Festival. The hospit...On January 27, 2012, So Chung, a Tibetan jour- nalist with Lhasa-based Tibet.cn was sent to thehospital due to a hypokalemia attack on his way to take photos in the coun- tryside during the Spring Festival. The hospital he was taken to was the People＇s Hospital of northwest China＇s Tibet Autonomous Region, where he received effective treatment and careful nursing.展开更多
Nonvolatile holographic recording is performed with green light in LiNbO3：Ce：Cu crystals. The refractiveindex change and the recording sensitivity are times better than those obtained by recording with red light, an...Nonvolatile holographic recording is performed with green light in LiNbO3：Ce：Cu crystals. The refractiveindex change and the recording sensitivity are times better than those obtained by recording with red light, and higher optical fixing efficiency is obtained. Correspondingly, theoretical investigations are given.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61178059 and 61137002)the Key Program of the Science and Technology Commission of Shanghai Municipality,China(Grant No.11jc1413300)
文摘Four different states of Si15Sb85 and Ge2Sb2Te5 phase change memory thin films are obtained by crystallization degree modulation through laser initialization at different powers or annealing at different temperatures. The polarization characteristics of these two four-level phase change recording media are analyzed systematically. A simple and effective readout scheme is then proposed, and the readout signal is numerically simulated. The results show that a high-contrast polarization readout can be obtained in an extensive wavelength range for the four-level phase change recording media using common phase change materials. This study will help in-depth understanding of the physical mechanisms and provide technical approaches to multilevel phase change recording.
文摘On January 27, 2012, So Chung, a Tibetan jour- nalist with Lhasa-based Tibet.cn was sent to thehospital due to a hypokalemia attack on his way to take photos in the coun- tryside during the Spring Festival. The hospital he was taken to was the People＇s Hospital of northwest China＇s Tibet Autonomous Region, where he received effective treatment and careful nursing.
基金This work was supported by the Science and Tech-nology Committee of China (No. 2002CCA03500) the National Natural Science Foundation of China (No.60177016).
文摘Nonvolatile holographic recording is performed with green light in LiNbO3：Ce：Cu crystals. The refractiveindex change and the recording sensitivity are times better than those obtained by recording with red light, and higher optical fixing efficiency is obtained. Correspondingly, theoretical investigations are given.
