双光子激光三维微细加工及信息存储技术

利用具有极高脉冲光强的飞秒激光器和对光束进行强聚焦的显微镜装置可以制造具有亚微米精度的三维微器件以及进行三维高密度信息存储。文本介绍了自行开发的双光子微细加工系统以及三维高密度信息存储系统 ,以及用该系统进行三维光学微细加工及三维光学信息存储的实验情况 ,给出了部分利用已建立的加工系统所获得的初步实验结果     

双光子激光三维微细加工及信息存储技术

利用具有极高脉冲光强的飞秒激光器和对光束进行强聚焦的显微镜装置可以制造具有亚微米精度的三维微器件以及进行三维高密度信息存储.文本介绍了自行开发的双光子微细加工系统以及三维高密度信息存储系统,以及用该系统进行三维光学微细加工及三维光学信息存储的实验情况,给出了部分利用已建立的加工系统所获得的初步实验结果.     

用于三维光学信息存储和微细加工研究的共焦激光扫描荧光显微镜

目前，利用双光子及共聚焦显微镜来进行三维光学高密度信息存储及三维光学微细加工正逐渐成为信息存储、微型电子器件和光子器件研究的重要方法。共焦光学系统具有三维分层扫描成像的能力，能有效地避免邻层的干扰，并与CD播放机有极好的兼容性，因而成为重要的三维光学数据读出方法。     

微细电火花加工装置的设计与应用

设计开发了一台用于微细电火花加工的微细加工装置，它主要由以下几个部分组成：花岗岩基座、精密伺服机构、精密高速旋转主轴、线电极磨削装置、微细电火花加工用的RC脉冲电源、加工状态检测系统和控制系统。在该装置上可以进行微细轴、微细孔和微三维结构的加工。具有4轴3联动功能，控制方便，容易实现数控插补功能。加工实验表明，在该装置上能稳定地加工出最小直径为Ф12μm的微细轴以及Ф25μm的微细孔，其长径比可分别达到25和10以上。并对半导体硅材料进行了加工实验，加工出的硅微梁深宽比达15以上。此外还给出了所加工的微三维结构实例。     

基于DVD双光束多层数据存储系统的设计及仿真

为了实现三维光信息存储的实用化, 在三维光盘存储实验系统的基础上, 改进、设计出了一种可用于三维数据存储的单侧读写光学头。对光学头进行了光学和控制系统的设计, 利用专门设计的耦合分光棱镜进行光束耦合和分离; 采用双音圈电机控制透镜的方式实现数据的选层; 进行了聚焦伺服系统的建模和仿真。结果表明双光束焦点同步误差保持在±3μm之内。     

基于DVD双光束多层数据存储系统的设计及仿真

为了实现三维光信息存储的实用化,在三维光盘存储实验系统的基础上,改进、设计出了一种可用于三维数据存储的单侧读写光学头。对光学头进行了光学和控制系统的设计,利用专门设计的耦合分光棱镜进行光束耦合和分离;采用双音圈电机控制透镜的方式实现数据的选层;进行了聚焦伺服系统的建模和仿真。结果表明双光束焦点同步误差保持在±3μm之内。     

移相掩模技术及其发展前景

移相掩模技术的出现和在高密度微电子器件研制中的成功应用,是近几年来光学微细加工技术发展的最主要成果。本文在具体介绍移相掩模基本原理、结构工艺改进以及最新应用成果的基础上,展望了光学微细加工技术的发展前景。并指出,在大力研制高性能实用步进曝光设备的同时,重点研究移相掩模或移相光刻技术,已成为迅速改变我国光学微细加工技术落后面貌的必由之路。     

光学微细加工设备及工艺的进步与微电子技术的高速发展

本文根据多年来光学微细加工技术的发展情况评述了光学微细加工目前及未来在微电子产业中的战略地位。并对光学微细加工设备涉及到的关键技术进行了系统分析。最后,作者从行业角度出发,就如何高速高效发展我国的光学微细加工技术提出了几点建议。     

飞秒激光双光子复杂结构的微细加工

阐述了双光子激发的原理和飞秒激光三维加工的技术特点。利用自行研制的飞秒双光子微细加工系统，在优化工艺参数的基础上，加工出一系列三维微结构，并实现了可动的三维微系统一齿轮轴系统的一次成型。     

光致漂白材料的激光三维信息高密度存储

光信息存储是目前数字化信息存储的主要手段，传统二维光信息存储中存在的不足限制了存储密度及存储容量的进一步提高。基于光致漂白材料的三维光信息存储机理，建立了共焦/双光子扫描荧光显微镜系统。采用一种新型光致漂白芴类衍生物ATFTBAr作为存储材料，利用飞秒激光实现了在该材料上的三维光信息存储和读取。存储层达到四层，每层间距和信息点间距分别达到了10 m 和8 m。对信息点进行了信号强度的识别和对比，详细分析了由于折射率失配所引起的信号串扰问题。研究表明，建立的实验系统和选用的存储材料能够较好地实现三维光信息存储。     

基于CAD三维技术的室分系统三维化设计

传统的室分系统是基于CAD的2D技术设计的,但是现在的网络结构越来越复杂,针对传统的室分系统做前期分析非常困难且难以检验.CAD的三维技术能够更加具体的显示出建筑的构造,基于CAD三维技术设计的室分系统,更便于对室分系统的前期的分析.     

立体时代的电视空间表现初探

在立体电视发展初期,面向立体电视的研究多偏重于技术领域,这种导向使立体电视表现艺术方面的研究趋于落后,在技术不断演变革新的趋势下,立体电视技术关注重点发生偏移,影响到整个市场的发展和产业布局。这与立体电影发展初期的情况非常相似。拟就立体技术的演变进化,与立体影视发展之间的联系进行分析总结,对立体电视的问题和缺陷进行研究,对立体时代的电视表现艺术发展方向,作出判断和思考。     

Morphology-based three-dimensional interpolation

In many medical applications, the number of available two-dimensional (2-D) images is always insufficient. Therefore, the three-dimensional (3-D) reconstruction must be accomplished by appropriate interpolation methods to fill gaps between available image slices. In this paper, we propose a morphology-based algorithm to interpolate the missing data. The proposed algorithm consists of several steps. First, the object or hole contours are extracted using conventional image-processing techniques. Second, the object or hole matching issue is evaluated. Prior to interpolation, the centroids of the objects are aligned. Next, we employ a dilation operator to transform digital images into distance maps and we correct the distance maps if required. Finally, we utilize an erosion operator to accomplish the interpolation. Furthermore, if multiple objects or holes are interpolated, we blend them together to complete the algorithm. We experimentally evaluate the proposed method against various synthesized cases reported in the literature. Experimental results show that the proposed method is able to handle general object interpolation effectively.     

Fast three-dimensional programmable two-selector

A proposed three-dimensional programmable two-selector (3DP2S) selects two topmost requests from a set of requests, using little more delay time than a programmable priority encoder selecting only one. Simulation results show that a 3DP2S can be used for scheduling combined input-output queuing switches with multiple parallel crossbar planes, without requiring faster components.     

High-Q factor three-dimensional inductors

In this paper, the great flexibility of three-dimensional (3-D) monolithic-microwave integrated-circuit technology is used to improve the performance of on-chip inductors. A novel topology for high-Q factor spiral inductor that can be implemented in a single or multilevel configuration is proposed. Several inductors were fabricated on either silicon substrate (/spl rho/ = 30 /spl Omega/ /spl middot/ cm) or semi-insulating gallium-arsenide substrate demonstrating, more particularly, for GaAs technology, the interest of the multilevel configuration. A 1.38-nH double-level 3-D inductor formed on an Si substrate exhibits a very high peak Q factor of 52.8 at 13.6 GHz and a self-resonant frequency as high as 24.7 GHz. Our 4.9-nH double-level GaAs 3-D inductor achieves a peak Q factor of 35.9 at 4.7 GHz and a self-resonant frequency of 8 GHz. For each technology, the performance limits of the proposed inductors in terms of quality factor are discussed. Guidelines for the optimum design of 3-D inductors are provided for Si and GaAs technologies.     

Scattering from three-dimensional cracks

Scattering from three-dimensional cracks is analyzed and measured. The crack geometry is modeled as a rectangular groove in a perfectly conducting surface. The groove forming the crack may be terminated with an open aperture creating a slit in the conducting surface or with an impedance boundary creating a trough. The scattered fields from a crack are analyzed with two types of scattering mechanisms: a component directly related to the scattered fields from a two-dimensional crack, and a traveling-wave component     

Direct-view three-dimensional display tube

The three-dimensional display tube is a novel type of cathode-ray tube that directly displays volumetric analog information. In contrast to other presentations in which the third dimension is simulated stereoscopically or with color, this device displays the information in actual space. The three-dimensional display tube utilizes a phosphor coated disc spinning at 900 rpm within an evacuated sphere. Upon excitation by a cathode-ray beam at selected times, any point in the volume "swept out" by the rotating disc may be illuminated at 30 cps. The result is true volumetric analog display, which is visible without any special viewing position or glasses. Thus, minimum observer fatigue and equal display resolution in depth are possible as compared with existing stereoscopic three-dimensional displays. Different color phosphors on either side of the disc and appropriate cathode-ray beam gating provide a simple means of two color display. Also, special deflection scans that are compatible with particular display requirements can result in a display equal in brightness and quality to commercial television display. Some typical applications as well as the technical aspects of this type of display such as brightness, data storage requirements, and feed circuit bandwidths are discussed. Compatibility with normal observer vision and ease of determining target intersections within the display volume are important properties of this type of display.     

Multifocal three-dimensional bootlace lenses

It is well known that a two-dimensional (parallel plate configuration) bootlace lens can be designed to have more than one focal point. Wide angle scanning capabilities of these lenses in two dimensions is well established, being larger for higher number of focal points. However, no three-dimensional bootlace lens having more than one focal point has been reported. It is the purpose of this paper to report on three-dimensional bootlace lenses having two, three, and four perfect focal points. Equations for lens surfaces are obtained for all three cases. The results of the aperture phase error analysis show that a lens with a larger number of focal points can be scanned to much larger angles in one plane at the expense of the scanning capability in the orthogonal plane.     

Direct three-dimensional image reconstruction

The problem of radar target-shape estimation for perfectly conducting complex objects is formulated as an image-reconstruction problem. A convolve-and-backproject algorithm is derived when the measurements are taken by radars located in three-dimensional space around the object region. The algorithm can be used directly in that there are no restrictions on the sensor placement; the sensors are not required to lie in a plane, for example, as is often assumed in many applications. Two possible convolving functions with desirable implementation characteristics are described. The algorithm is applicable to the general problem of reconstructing the density function of three-dimensional objects and applies to the radar shape-estimation problem as a special case.