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Super-resolution filters based on a Gaussian beam are proposed to reduce the focusing spot in optical data storage systems. Both of amplitude filters and pure-phase filters are designed respectively to gain the desired intensity distributions. Their performances are analysed and compared with those based on plane wave in detail. The energy utilizations are presented. The simulation results show that our designed super-resolution filters are favourable for use in optical data storage systems in terms of performance and energy utilization. 相似文献
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In this Letter,a new approach of optical tape for high capacity multilayer data storage is proposed.We show that a length of 5 cm and width of 2 cm of soft and transparent optical tape can be used for two-photon three-dimensional bit data storage.We successfully demonstrate writing and reading of six layers of data storage with a transverse bit separation of 2μm and an axial separation of 2.5μm in a tetraphenylethylene-doped photobleaching polymer.The fluorescence intensity is insensitive to the storage depth of the photopolymer matrix.Thus,the optical tape that we put forward in the experiment can help people realize true large data storage in the future,like magnetic tape.This method significantly paves a novel way for solving big data storage problems. 相似文献
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波分复用器(WDM)作为光纤通信中一种重要的元器件,能够在不改变原有通信线路的条件下,有效地增加光纤通信的容量。传统的波分复用器主要基于色散原理,分光比不能准确控制,信号间串音大;而基于平面波导中多模干涉效应研制的波分复用器,具有体积小,损耗低(<05dB),不受光偏振态的影响,易集成等优点;在很宽的工作波长范围内,受环境变化影响小,适合现代通信器件集成化的发展。利用多模干涉效应(MMI)集成的098μm/155μm波分复用器,波导长度仅几个毫米,分光比例准确,隔离度可达30-40dB,波形失真小,它不仅可用于155μm光纤激光器和EDFA的集成,也可用于实现1×N和N×N分光,在光纤通信中有广泛的应用前景。 相似文献
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一维光子晶体偏振特性研究 总被引:3,自引:0,他引:3
利用传输矩阵法探讨一维光子晶体中两种不同的偏振模式的特性 .通过改变周期性分层介质的填充率、厚度、入射光频率、入射角度等参数 ,得到一维光子晶体在光频 (特别是近红外 )范围内的透射谱与以上因素的关系 ,从而设计了一维光子晶体偏振器 .理论计算得到它对p偏振的透过为 - 3.0× 10 -4dB ,而对s偏振透过仅为 -4 0dB ,偏振度为 96 .7% .结果表明可以用光子晶体实现小尺寸、高偏振度的偏振器件 . 相似文献
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We study a SiC-based diode with a p^ nn^ structure for picosecond semiconductor closing switch and discuss the physical process, which underlies the operation principle of high-power closing switch based on a delayed breakdown diode. By two-dimensional mixed device-circuit simulations, we demonstrate a single device reliably operated at 4kV and at risetime 11 ps with high output dV/dt = 276kV/ns, which is in good agreement with the experimental results. 相似文献
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