共查询到20条相似文献,搜索用时 15 毫秒
1.
《Microelectronic Engineering》2007,84(5-8):766-769
For 32-nm technology node, thermal treatment is one of the process extension techniques with 193-nm ArF lithography equipment and chemically-amplified resist (CAR). However, it is difficult to use these techniques in the manufacture process because the optical proximity effect of thermal effects is quite severe. In this paper, thermal processes, such as softbake, post-exposure bake and thermal reflow, are described and modeled to investigate the property changes of a positive type, 193-nm CAR. The simulated results agree well with the experimental results. For the optical proximity correction (OPC) of the thermal effects, an orthogonal functional method is introduced. Due to contact hole (C/H) pattern, the underbake of post-exposure bake (PEB) and thermal reflow are performed for the 45-nm critical dimension (CD) by using the OPC simulated images, to demonstrate the possibility of controlling these thermal processes for the formation of 32-nm CD. 相似文献
2.
M. Victoria R. Herrero C. Domínguez I. Antn S. Askins G. Sala 《Progress in Photovoltaics: Research and Applications》2013,21(3):308-318
The irradiance and spectral distribution cast on the cell by a concentrating photovoltaic system, typically made up of a primary Fresnel lens and a secondary stage optical element, is dependent on many factors, and these distributions in turn influence the electrical performance of the cell. In this paper, the effect of spatial and spectral non‐uniform irradiance distribution on multi‐junction solar cell performance was analyzed using an integrated approach. Irradiance and spectral distributions were obtained by means of ray‐tracing simulation and by direct imaging at a range of cell‐to‐lens distances. At the same positions, I–V curves were measured and compared in order to evaluate non‐uniformity effects on cell performance. The procedure was applied to three different optical systems comprised a Fresnel lens with a secondary optical element consisting of either a pyramid, a dome, or a bare cell. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
3.
在光外差测量中,信号光与本振光的光程差、探测器的相对位置、探测器光敏面相对于激光光斑的大小和聚焦透镜的焦距,对系统的外差效率都有重要影响。针对光学外差无损探伤应用,计算分析了这4个因素对外差效率的影响。对外差效率的数值计算表明:系统外差效率随着光程差的增大而降低,探测器位置不同,此下降趋势不同;探测器相对位置和探测器光敏面大小则具有最佳值;聚焦透镜对外差效率有很大的影响,其焦距只能在一个很窄的范围内选择,被测目标物体与测量系统中透镜的距离越近,此选择范围越窄。根据理论计算所设计的超声外差探伤系统,外差效率可达0.965。系统用于由脉冲激励超声工件的内部探伤,观察到距离1555mm处钢管微小裂缝的超声反射信号。 相似文献
4.
基于光纤传输的激光引信仿真系统 总被引:1,自引:0,他引:1
激光引信是制导武器普遍使用的近炸引信,然而要在实验室内获得接收机窗口处的光信号功率并验证信号处理系统的准确性是比较困难的。针对这一问题,提出一种基于光纤传输的激光引信仿真系统。此系统首先通过耦合透镜和自聚焦透镜将发射机输出的激光束耦合进入光纤通道,然后通过程序控制的宽带光强衰减器实时地模拟光束经过目标反射引起的光强衰减,最后将衰减后的光信号通过光纤传输并经过耦合透镜馈入引信的接收机窗口。该系统的设计能够较为准确地模拟激光引信在交会过程中的回波光功率大小,并可实时地仿真激光引信各通道的回波信号,从而可以在实验室内验证激光引信信号处理系统的可靠性。 相似文献
5.
6.
光学限制器是光学系统的保护装置,其保护特性 是由光限制材料与光强或功率有关 的光学非线性效应所产生的,其中光折变晶体中的光感生散射便为该效应之一,多年来受到 世界研究者的广泛研究和关注。对于这类光感生散射,有人提出它是由晶体的表面和体散射 产生的,研究使用的晶体为 LiNbO3:Fe、LiTaO3、BaTiO3,并使用固定的晶体样品和 聚焦透 镜间距。为了进一步探索该散射的产生机理,本文研究了掺铁铌酸钾晶体在激光照射下产生 的光感生各向异性散射特性,利用Z扫描技术测量了该晶体中的 光感生折射率变化,并对晶 体中光散射形成的光学限制特性进行了研究。分析表明该各向异性散射主要是由掺铁铌酸钾 晶体中光感生的柱面透镜效应所导致的。利用光折变晶体中光感生光散射效应的光学限制器 ,一方面可以通过改变晶体尺寸、透镜焦距、小孔光阑大小等来调整其性质,另一方面因其 利用的是低功率连续波激光进行工作,所以能够承受更大的功率和更长的寿命。 相似文献
7.
Optical proximity effects arising from individual resist characteristics are investigated. The parameters studied are those used in photoresist exposure and development simulation using the SOLID and Prolith/2 programs. The optical proximity effect is found to be independent of the exposure parameters but greatly affected by the development process and is shown to be a function of the Mack parameter, n, which is related to the resist contrast, γ. Finally, in order to put this effect into perspective with other resist selection criteria, the development parameter, n, is also shown to be related to wall angle and depth-of-focus (DOF).
The results of this investigation will therefore enable the user to select the most appropriate photoresist for a specific application. 相似文献
8.
深紫外光刻投影物镜是光刻机的核心部件,然而无论是照明光场偏振态的空间分布,还是光刻投影物镜自身的偏振像差都将改变光束的紧聚焦特性,对成像质量造成不可忽略的影响。基于三维琼斯矩阵,把偏振像差函数推广到三维空间,建立了三维相干光场中偏振像差的评价方法,并分析了典型的偏振敏感光学系统深紫外光刻投影物镜的三维偏振像差,详细阐述了其物理意义。研究发现:三维偏振像差函数的光瞳分布与视场、光学薄膜以及光学系统的自身结构密切相关。深入讨论了光学薄膜及偏振效应对光刻投影物镜成像质量的影响,进一步研究了照明光场的偏振态分布与光学系统波像差的关系,研究表明:光学薄膜引入的附加位相将导致光刻投影物镜的像质明显下降,而采用径向矢量光场照明可以改善成像质量。 相似文献
9.
Piyush Pathak Qiliang Yan Thomas Schmoeller Ebo Croffie Artak Isoyan Lawrence S. Melvin III 《Microelectronic Engineering》2009,86(4-6):500-504
Extreme ultraviolet lithography (EUVL) is a leading candidate for the 22 nm node lithography and beyond. However, there are still some critical problems before EUVL may be deployed in high-volume manufacturing. One of the critical problems is to estimate the EUVL aerial image formation for optical proximity correction (OPC) in order to compensate for EUVL effects such as shadowing and flare. This study discusses aerial image formation through modeling of optical transfer function to assimilate optical diffraction, long range layout dependent flare effects, and shadowing effects due to non-telecentric imaging optics in the EUV case. Hence, after optimizing optical process parameters to model the EUV aerial image, this study will investigate OPC modeling methods employed to compensate these optical effects in the mask design flow. 相似文献
10.
An optical isolator for laser-to-single-mode fiber coupling is discussed. The coupling unit consists of a confocal two-lens system with a spherical glass lens and a planoconvex lens which is made of yttrium iron garnet (YIG). To minimize the number of elements, the YIG lens is used as a Faraday rotator as well as a coupling lens. Nevertheless, the planoconvex YIG lens satisfies the requirements of high coupling efficiency, high isolation, and low optical feedback from the Faraday rotator. The arrangement is theoretically and experimentally investigated. At a coupling efficiency of 34%, the total optical feedback into the laser diode was measured to be about -60 dB 相似文献
11.
为实现均匀圆形光斑的照明,提出了一种自由曲面平凸透镜的算法。依据非成像光学核心理论:光学扩展量守恒和能量守恒,根据Snell定律,建立透镜轮廓曲线所满足的常微分方程,采用Matlab中的DDE(动态传输)技术与Tracepro中的Scheme语言完成动态数据的链接,从而完成透镜的3D建模,省去了导入3D软件拟合曲线所带来的误差,让建模变得更加精确。结果表明,该种算法可在特定区域实现均匀照明,透镜直径23 mm,材质为光学级PC,且在透镜距离光源10 mm时光学效率可达51.99% 相似文献
12.
针对红外光学材料折射率不均匀导致系统波前产生异常像差,从而引起镜头像质严重下降的问题,提出了一种光学件位置迭代调整和面形修配相结合的系统波前补偿方法,实现面向高性能的红外折射式镜头装调。在光学件精密定心的基础上,设计了在线装调检测装置,依据镜头实测波前并结合计算机辅助装调技术,通过迭代调整光学件位置矫正系统波前初阶像差。对系统残留的中高阶像差,根据各视场测得的系统波前综合分析计算,采用修配光瞳处光学件面形,引入反残留波像差的方式补偿。实验上,通过对某红外折射式镜头装调,将镜头三个视场系统波前RMS (λ=3.39μm)分别由精密定心后的0.162λ、0.118λ、0.166λ降低至0.064λ、0.040λ、0.067λ,平均MTF (@25 lp/mm)由0.31提升至0.67。结果表明,这种装调技术对红外折射式镜头系统波前补偿效果明显,可大幅提升镜头成像性能,具有重要的工程应用价值。 相似文献
13.
A novel wave optical simulation method [a localized boundary element method (BEM)] has been developed. This method enables us to execute 3-D wave optical simulation with much smaller memory space and much shorter calculation time than conventional BEMs or finite-difference time domain methods. The light gathering power dependence on cell size and microlens height and distance, the color shading characteristics of inner lens structures, and the light gathering power and cross talk of light waveguide were analyzed by this method. A smaller cell needs a shorter focal length microlens, which can be realized by inner lens structures in CCD or the waveguide structures in CMOS image sensors. It is shown that this method can optimize these structures by calculating the color shading dependence on the microlens shape and the cross talk dependence on the waveguide materials. This method was found to be powerful and useful for the 3-D wave optical analysis of image sensors. 相似文献
14.
15.
某空间气体监测仪结构布局紧凑,在较小尺寸空间内交错布置有8个镜头组件、11台电子设备内热源和2个电机。内热源数量众多,工作时间长,与镜头控温要求差别大,且1个电机为二维转动热源,这些特点给热设计带来挑战。为有效解决热控难题,采用了多种设计思路组合。基于热管理思路对监测仪各部组件热行为进行系统管理,以节省热控资源;基于间接热控思路对所处热环境复杂的光学镜头组件进行控温,提高其控温精度和温度稳定度;对转动电机则进行辐射冷却,避免在传热路径中引入挠性转动环节,以提高热控系统可靠性;并基于结构热控一体化设计,在结构上充分保证热设计各项需求。热平衡试验结果表明:高低温工况下,监测仪各部组件温度均满足指标要求,且整个寿命周期内,光学镜头温度稳定度较高,同一工况下光学镜头最大温度波动在1℃以内,实现了多热源复杂工作机制下光学镜头的高精度精密热控。 相似文献
16.
17.
18.
19.