光存储技术应用及其发展

在介绍光存储技术原理及应用的基础上,分析了国内外高清晰度光盘技术方案,包括采用红光技术的EVD、NVD、FVD和采用蓝光技术的BD、HDDVD．CBHD。简要介绍了三维光存储技术,并针对我国高清晰度光存储技术的发展进行了分析并提出了几点建议。     

新型波导多层光存储原理和实验

一种新型的波导多层存储器(WMM)由多层平面光波导叠合构成，利用波导缺陷记录数据，通过缺陷的光散射效应读出数据，并利用波导对光的空间约束作用实现层选址。制作了10层WMM模型器件，并给出了数据读出原理性实验结果。结果表明：WMM的层内信噪比大，层间信号串扰小，是一种很有潜力的三维光存储技术。     

第四代光存储技术——近场光存储

固体浸没透镜（SIL：Solid Immersion Lens）近场光存储能够突破传统光学衍射极限的限制，是很有发展潜力的第四代光存储技术。日本Sony公司在近场光存储领域一直位于领先地位，已成功研发了采用双轴力矩器装卡SIL的近场光盘系统，可以达到存储容量为112GB（80．6Gb／in^2）、数据传输率为72Mbps，以及存储容量为m2GB（80．6Ch/in^2）、数据传输率为108Mbps的记录结果。     

电子俘获光存储技术

随着计算机和信息产业的发展，越来越多的信息内容以数字化的形式存在、传输和保存。因此对大容量信息存储技术的研究就逐渐升温。激光技术的不断成熟，尤其是半导体激光器的成熟应用，使得光存储从最初的微缩照相发展成为快捷、方便、容量巨大的存储技术，各种光ＲＯＭ纷纷亮像，到最近的ＤＶＤ—ＲＯＭ发布之时，双面５．２５英寸大小已经可以存储１０Ｇ比特的数据。 与磁介质存储相比光存储技术寿命长，非接触式读／写，信息的载噪比（ＣＮＲ）高，信息位的价格低，但是不足也是明显的：光盘机价格较贵，传输速率低，重复擦写技术尚不成…     

电子俘获材料在光存储技术中的应用

阐述了电子俘获光存储技术原理,进行了图像写／读／擦除及图像加／减等实验,探讨了电子俘获光存储中的动力学机制,研究了电子俘获材料中读出光、写入光和发射光三者之间的关系。实验表明,电子俘获材料以其写／读、擦速度快、存储密度高以及无限的读写循环寿命等优点,在光存储、光信息处理领域具有非常广阔的应用前景。     

模块化蓝光光存储性能静态测试系统

蓝光光存储是信息存储领域发展的一个重要方向。测试系统是研究蓝光光存储材料的必备条件，为建立蓝光光存储研究平台，设计和搭建了一套模块化蓝光光存储性能静态测试系统。激光工作波长为406．7nm。系统采用调制解调技术降低系统噪声，提高测量粘度：采用光点移动模式降低对样品尺寸的要求；采用纳米平台提高记录点的反复定位性能。实验结果证明测试系统性能良好，可以满足蓝光光存储性能静态测试要求。     

Growth of ZnMgSSe and a blue-laser diode

This paper describes the characteristics of ZnMgSSe, which is a material suitable for the cladding layer of a blue-laser diode. A blue-laser diode was operated at room temperature at a wavelength of 480 nm, and the lifetime of the continuous-wave operation of the II–VI LD was over 3 min. These values are the best so far reported for a II–VI LD.     

Battle of the blues

Will lack of industry agreement on standards hamper the potential of blue lasers in consumer electronics systems?.     

Optical receiver IC for CD/DVD/blue-laser application

In this paper, an optoelectronic receiver IC for CD, DVD, and Blue-Laser optical data storage applications is presented. The IC was developed in a 0.5-/spl mu/m BiCMOS technology with integrated PIN photodiodes. It includes a new architecture of high-speed and low-noise variable gain transimpedance amplifiers witch current preamplifier input. The amplifier transimpedance gain is programmable over a gain range of 130 /spl Omega/ to 270 k/spl Omega/ by a serial interface. The amplifier small-signal bandwidth is 260 MHz for the highest gain, which gives a gain-bandwidth product of 70 THz/spl Omega/ and a sensitivity improvement by a factor of 2 compared to published OEICs. The amplifiers support a special write/clip mode which realizes a nonlinear gain reduction for high input signals. The output voltage buffers are 130-/spl Omega/ impedance matched for optimized data transmission over a flex cable. The impedance is generated by active-impedance synthesis to increase the output dynamic range.     

Kinematics of the Beating Heart

We introduce a new approach to the quantification of myocardial strain. It utilizes the theoretical frame work of kinematics and can thus account for the large time-varying displacements present in the intact beating heart. For arbitrary small segments of myocardium, we show how these displacements can be described completely by a rotation tensor and a stretch tensor. We demonstrate the physiologic meaning of this analysis in an anesthetized dog. An epicardial region was seen to exhibit a local twist quantified by the rotation tensor and a segmental shortening quantified by the stretch tensor.     

Silvar serves to beat the CTE blues

Continuing III–Vs Review's series of articles on packaging related topics in advanced semiconductors, we consider the demands of matching the coefficient of thermal expansion of a chip with that of its package. Matching CTEs removes some of the thermal stress problems that cause GaAs surface cracks. Short term cyclic stress still occurs, however, under transient conditions of power switching and environment.     

Beating the transistor-developments in UHF tube technology

Three decades ago, the development of the transistor threatened to relegate radio valves to the museums. But tube technology, against most expectations, has had no difficulty in staying ahead of the upstart science of solid-state electronics. The author presents a history of tube development from 1908 to the present day. Modern UHF broadcasting equipment, suitable for the application of such tube technology are also described     

Beating the heat [CMOS hot-carrier reliability]

CMOS hot-carrier reliability at both transistor and circuit levels has been examined. Accurate reliability assessment requires defining suitable criteria for acceptable performance for both circuit and individual transistors. As device designers meet demands for greater speed and more complex circuitry accompanied by shrinking the size of transistor into the deep-submicron regime, they have to contend with increase in current densities and higher electric fields. Though in general a MOSFET's driving capability increases as the channel length decreases, the resulting high field will eventually limit the driving capability of the device. The authors discuss improving CMOS hot-carrier reliability through analysis, modelling and simulation     

Beating the system: abuses of the standards adoption process

The current processes by which telecommunications standards are adopted are flawed. Certain companies are able to exploit these flaws to extract hundreds of millions of dollars in patent royalties from the telecommunications industry. In particular, companies can: (1) word their patent statements to appear to comply with the bylaws of an organization while not actually doing so; (2) interpret their statements to provide a basis to refuse to offer licenses to certain parties; and (3) hide their intellectual property until after a standard has been adopted and has gained widespread acceptance. Exposure of these strategies may enable contributors to better analyze the patent statements of standard committee members and generate improved organization bylaws