共查询到20条相似文献,搜索用时 109 毫秒
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It is difficult to exactly control the film thickness of optical disk multilayer in the actual coating process. The thickness error becomes a main factor affecting the optical characters of the film system. The thickness error′s sensitivity factor of dielectric optical multilayer is derived from the optical matrix in this paper. The effect of the thickness error on the reflectivity or reflectivity contrast of the optical disk multilayer is analyzed with a numerical calculation. The sensitivities to thickness error for different layers or in different film-thickness ranges are compared and discussed. A sketchy method defining allowable thickness error is given. Some experimental results verify the applicability of our theoretical analysis. 相似文献
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WANG Yang GU Donghong GAN Fuxi 《Chinese Journal of Lasers》2001,10(3):206-210
1 Introduction Recentlyopticaldisksabletostorealargequantityofinformationhavebeenusedascompactdisk (CD ) ,digitalversatiledisk(DVD) ,andtheirrecordableorrewritabletypes(suchasCD R ,CD RW ,DVD R ,andDVD RAM ) [1 ] .Anopticaldiskisakindofmultilayersystemdepositedona… 相似文献
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光学光刻是目前超大规模集成电路(VLSI)制备中主要的微米和亚微米的图形加工技术,这一技术将继续保持其主导地位成为90年代VLSI发展的关键。本文综述了近年来光学光刻工艺的发展,主要介绍了G线(436nm)、Ⅰ线(365nm)和准分子激光光刻的现状,并对实现高的光学光刻分辨率所必须解决的透镜设计、套准精度和像场面积等问题作了详细描述。最后展望了发展方向、 相似文献
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采用高频溅射方法制成Te-In-Sb系统的非晶态薄膜.系统的研究了不同组分薄膜的透射、反射谱,及其在结晶过程中的变化.用透射电镜研究了Te-In-Sb薄膜的结构和晶化过程.分析了组分对薄膜的吸收系数、介电常数、光学能隙等光学性质的影响.并由此综合评价了Te-In—Sb系统中比较适合作为光盘介质的组成. 相似文献
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K F Nelson 《The Journal of information and image management》1985,18(1):16-18
Users of micrographics and those individuals who work with paper-based systems are probably intrigued by the promise of increased productivity available through optical disk technology. However, those with a thorough understanding of all that's been written about the technology are in the minority. This article hopes to help lift the veil of uncertainty surrounding the impact of optical disk technology as it applies to electronic document image systems, and to also add to the knowledge base of those who have already reached a respectable level of understanding. 相似文献
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Diffuse optical tomography (DOT) is one of the emerging modalities for the non-invasive imaging of thick biological tissues using near-infrared (NIR) light. This article reviews the fundamentals and development of DOT technology since its advent in the early 1990s, including the modeling of light propagation in biological tissues which strongly scatter and weakly absorb NIR light, the optical properties of biological tissues in the NIR wavelength range, three typical measurement methods, image reconstruction algorithms, and so forth. Then various studies are referred to for improvement of the DOT images, which are essentially low in quality due to the ill-conditioned and underdetermined problem. Studies and clinical applications presently attracting much attention are discussed in some detail. Finally, the expected future developments are summarized. 相似文献
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V. O. Gladyshev P. S. Tiunov A. D. Leont’ev T. M. Gladysheva E. A. Sharandin 《Technical Physics》2012,57(11):1519-1528
Anisotropy arising in moving media is considered. In these media, the phase velocity of light nonlinearly depends on the velocity vector field of the medium due to anisotropic binding forces between lattice atoms. Observations of the optical anisotropy of light in a rotating optically transparent medium are discussed. Laser radiation with wavelength ?? = 0.632991 ± 1 × 10?7 ??m propagating in an interferometer was passed through a rotating optical disk D = 62 mm in diameter. The projection of the beam??s path length in the medium onto the flat surface of the disk is l = 41 mm; the refractive index of the glass and its thickness are, respectively, n = 1.71250 for ?? = 632.8 nm and 10 mm; and the angle of incidence of the beam on the flat surface of the disk is ?0 = 60°. The optical disk is rotated in two directions, and its rotation frequency may reach 250 Hz. Experimental data confirm the linear dependence of the fringe shift on the velocity of the medium up to 29.6 m/s. The measurement accuracy is sufficient to detect angular variations ??? = 3 × 10?5 in the position of fringes at a fixed rotation velocity of the optical disk. 相似文献
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为了使光盘获得优良的记录/读出性能并能够长期稳定地使用,必须优化设计相变光盘的多层膜结构。采用自行设计的模拟分析相变光盘读出过程设计软件,从光学角度出发模拟计算了蓝光(405nm)相变光盘的膜层结构,研究了多层膜系的反射率和反射率对比度等光学参量与各层膜厚度和槽深的关系。研究得出的最佳多层膜结构为:下介电层/记录层/上介电层/反射层的厚度对于台记录为100nm/10nm/25nm,/60nm,而对于槽记录则为140nm/15nm/30nm,/60nm,槽深为50nm。模拟计算结果对于将来高密度蓝光相变光盘的制备具有一定的指导意义。 相似文献
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信号探测是固体浸没透镜成为实用存储技术的一个必需的组成部分。对在该项研究中获得的理论和实验成果进行了介绍。总结了针对固体浸没透镜机理的三维矢量理论 ,对影响信号探测的因素 ,例如头盘间距、盘片结构和光的偏振态等进行了讨论。介绍了基于固体浸没透镜光存储中信号探测的新技术和重要的实验结果。 相似文献
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By applying nonequilibrium Green's function formalism combined first-principles density functional theory, we investigate the electronic transport properties of the phenylazoimidazole optical molecular switch. The molecule that comprises the switch can convert between the cis and the trans forms upon photoexcitation. The influence of HOMO–LUMO gaps and the spatial distributions of molecular orbitals on the electronic transport through the molecular device are discussed in detail. Theoretical results show that the current through the trans form is significantly larger than through the cis form, which suggests this system has attractive potential application in future molecular switch technology. 相似文献
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By 1939, when Chandrasekhar’s classic monograph on the theory of Stellar Structure was published, although the need for recent star formation was fully acknowledged, no one had yet recognized an object that
could be called a star in the process of being born. Young stellar objects (YSOs), as pre-main-sequence stars, were discovered
in the 1940s and 1950s. Infrared excess emission and intrinsic polarization observed in these objects in the 1960s and 1970s
indicated that they are surrounded by flattened disks. The YSO disks were seen in direct imaging only in the 1980s. Since
then, high-resolution optical imaging with HST, near-infrared adaptive optics on large ground-based telescopes, mm and radiowave
interferometry have been used to image disks around a large number of YSOs revealing disk structure with ever-increasing detail
and variety. The disks around YSOs are believed to be the sites of planet formation and a few such associations have now been
confirmed. The observed properties of the disk structure and their evolution, that have very important consequences for the
theory of star and planet formation, are discussed. 相似文献
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介绍了光学电流测量技术的发展情况,描述了目前几种主要的互感器结构及其基本原理,并对各自存在的问题及解决途径进行了讨论。从研究现状来看,块状玻璃型传感器技术相对成熟,已经有商业产品问世;混合型传感器测量精度较高,但传感头有源电路的供电技术复杂,还没有圆满的解决方案;全光纤型是光学电流互感器发展的最终目标,目前存在的主要问题是光纤的固有线性双折射难以处理,有赖于新型光纤材料及集成光学元件的进一步发展。最后综合评述了光学电流互感器技术的发展趋势及产业化前景。 相似文献
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For the requirement of higher storage capacity of an optical disk, it is a good choice to shorten pit length and linewidth.
However, the conventional laser beam mastering is difficult to fabricate smaller pit length and linewidth because of the optical
diffraction limit. In order to solve this problem, optical disk mastering using electron beam lithography is presented. The
process parameters of the electron beam mastering such as beam current, constant linear stage velocity, developing time, and
focus distance are discussed in this research. In the experiments, it was found that the focus distance is an important parameter
to fabricate nano-linewidth. The experimental results reveal that the 10 μm variance in focus distance causes about 12% variation
in linewidth. The photoresist with nano-pattern defined by eletron beam was transferred into metal Ni–Co (Nickel–Cobalt) mold
by electroplating process. The Ni–Co mold with hardness larger than Vicker Hardness (Hv) 650 was developed. Then, with the
Ni–Co mold, LIGA (German: Lithographie GaVanoformung Abformung) process was applied to replicate high-density optical disk.
The Ni–Co mold is served as a master for hot embossing process to transfer the nano-pattern onto PMMA sheet. Since the feature
size is in nano-meter range, the study presents an innovative demolding mechanism to demold the master from the PMMA sheet
without damaging the nano-meter structure. A spiral nano-groove with 112 nm in linewidth and 80 nm in depth has been successfully
fabricated about 50 Gbytes storage capacity. 相似文献