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A novel read-only super-resolution optical disc structure (substrate/mask layer/dielectric layer) is proposed in this paper. By using a Si thin film as the mask layer, the recording pits with a diameter 380nm and a depth 50nm are read out on the dynamic measuring equipment; the laser wavelength α is 632.8nm and the numerical aperture is 0.40. In the course of reproduction, the laser power is 5mW and the rotation velocity of the disc is 4m·s-1. The optimum thickness of the Si thin film is 18nm and the signal-to-noise ratio is 32dB. 相似文献
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Improvement of Three-Dimensional Resolution in Optical Data Storage by Combination of Two Annular Binary Phase Filters 下载免费PDF全文
We present an improved confocal readout system to achieve three-dimensional superresolution. This improved system is based on a combination of two different annular binary phase filters, the one designed for increasing the transverse superresolution and the other for achieving axial superresolution. By adjusting the pupil parameters, each pupil can be well designed. The simulation results show that with this improved system, the area of the central lobe of the three-dimensional point spread function of the read optics is greatly reduced. Moreover, the side-lobes are extinguished. 相似文献
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AgInSbTe薄膜的短波长记录性能分析 总被引:1,自引:0,他引:1
采用自制的装置研究了Ag5In5Sb47Te33薄膜的静态记录性能与记录激光的功率和脉冲宽度的关系,并对其记录畴形貌特点进行了直接观察。结果表明只有记录激光的功率和脉冲宽度在一定范围之内才能起到信息记录的作用,所得的记录畴形貌十分清晰,基本为非晶态Ag5In5Sb47Te33;小于该范围的激光能量不能使材料结构发生较大的变化,所得的记录畴形貌模糊,反射率对比度低于2%;大于该范围所得的记录畴由烧蚀区和其周围的非晶态Ag5In5Sb47Te33组成。另外,得到了记录激光功率为12mW、脉冲宽度为90ns的Ag5In5Sb47Te33薄膜的短波长最佳记录条件,其记录畴的反射率对比度为22%,直径为380nm-400nm。 相似文献
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研究了自行研制的CaS(Eu,Sm)电子俘获材料的光学性质;利用~200μm厚的CaS(Eu,Sm)高聚物膜作为记录底片,进行了实物图象的拍摄实验。这种记录材料具有很多有吸引力的优点:不需要用化学溶液进行定影显影,可以实时读出,可快速擦除,能反复使用,具有大的线性范围等。实验表明,电子俘获材料是一种很有前途的光记录材料。 相似文献
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A stimulated emission depletion is capable of breaking the diffraction limit by exciting fluorescent molecules with a solid Gaussian beam and quenching the excited molecules with another donut beam through stimulated emission. The coincidence degree of these two beams in three dimensions will significantly influence the spatial resolution of the microscope.However, the conventional alignment approach based on raster scanning of gold nanoparticles by the two laser beams separately suffers from a ... 相似文献