共查询到19条相似文献,搜索用时 171 毫秒
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针对目前二元光学元件掩模制作工艺过程的诸多不足,对连续型平面衍射聚光透镜掩模的激光直写制作工艺进行了研究。基于基尔霍夫标量衍射理论,采用光线追迹法设计了连续型平面衍射聚光透镜掩模。采用激光直写技术,利用CLWS 300M/C极坐标激光直写设备、S1830光刻胶和MICROPOSIT 351显影液,进行了刻写实验。实验表明,激光能量、预烘烤温度、显影液浓度以及预曝光对掩模微结构的制作均有影响。最后制作了掩模。与二元光学元件掩模的制作工艺相比,该技术具有工艺简单、制作周期短且易于操作的优点。 相似文献
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优化掩模分布改善数字光刻图形轮廓 总被引:2,自引:1,他引:1
基于数字微反镜(DMD)的无掩模数字光刻系统可用于IC掩模制作或育接作为微结构的加工工具,有着广泛的应用前景.但理沦和实验均发现基于DMD数宁光刻系统加工连续表面微结构元件时,往往难以获得预期的图形轮廓,加工出的图形表面具有规则的振荡起伏.在深入探讨DMD灰度图形传递的基础上,分析了空间像畸变产生的物理机制,并提出用模拟退火算法来优化掩模图形,在5%的相对曝光量偏差范围内模拟表明优化有效地消除了表面起伏,最后利用优化的掩模实验加工出表面轮廓比较良好的轴锥镜阵列.该方法能有效改善面形质量,而且不存在掩模制作等问题,这对于制作高质量的微结构元件有重要意义. 相似文献
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极紫外(EUV)投影光刻掩模在斜入射光照明条件下,掩模成像图形位置和成像图形特征尺寸(CD)都将随入射光方向变化,即存在掩模阴影效应。基于一个EUV掩模衍射简化模型实现了掩模阴影效应的理论分析和补偿,得到了掩模(物方)最佳焦面位置和掩模图形尺寸校正量的计算公式。掩模(物方)焦面位置位于多层膜等效面上减小了图形位置偏移;基于理论公式对掩模图形尺寸进行校正,以目标CD为22 nm的线条图形为例,入射光方向变化时成像图形尺寸偏差小于0.3 nm,但当目标CD继续减小时理论公式误差增大,需进一步考虑掩模斜入射时整个成像光瞳内的能量损失和补偿。 相似文献
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利用Nd∶KGW激光器,采用光束扫描宽化技术和掩模微缩成像方法研制了用于微打标及微型零件雕刻成形的激光掩模微加工系统。系统采用计算机打印的塑料胶片或液晶作掩模,光束扫描面积为(有效掩模面积)30 mm×30 mm。微缩成像系统的缩小倍率分别为8~10倍(f=100 mm透镜)和15~20倍(f=50 mm透镜)。对该系统的加工尺寸和加工精度进行了分析。实验结果表明:系统达到的最小标刻宽度和加工图形精度均为10μm,与分析结果一致。系统的单次加工深度为0.07~0.1μm,最大加工深度为200μm,可满足工业微加工技术的基本要求。 相似文献
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We present the digital-division-mask technique for the first time to solve the problem of decline in transverse resolution, which is caused by using digital micro-mirror device (DMD) to make binary optical elements (BOEs). One high-frequency gray-tone mask can be divided into several low-frequency masks by fixed or variable low-frequency period sampling. And the superimposed lithography effect of these low-frequency masks in the spatial or temporal domain is the same as that of the original high-frequency gray-tone mask. The paper firstly analyzes the digital-division-mask technique in theory and describes the feasibility and advantages. Then taking the diffractive surface fabrication of refractive-diffractive hybrid lens as an example, we conclude that the digital-division-mask technique improves the edge sharpness of lithography pattern, and enhances the diffractive efficiency of BOEs by experiment. 相似文献
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《Photonics and Nanostructures》2014,12(1):75-82
In this paper, we investigate coupling of light to slow modes in a photonic crystal power splitter composed of a Y-junction and two 60° bends. First, a combination of two cascaded bends which is commonly used in integrated photonic crystal circuits is studied in slow light frequency regime. We propose a structure that its transmission spectrum covers the high group-index frequencies near the band edge. Also, by structural modifications, high transmission near to 95% is achieved in slow light bandwidth. Next, we study the complete structure of a photonic crystal power splitter with parallel outputs based on a Y-junction integrated with two 60° bends. Using modified bends and reducing sharpness of Y-junction, the efficiency of splitting increases in both high and low group-index frequency bands. The optimized structure has an average efficiency of 82% in slow mode regime. This structure can be used in photonic crystal based slow light devices, such as Mach-Zehnder interferometers. 相似文献
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Aberration invariant optical/digital incoherent systems 总被引:1,自引:0,他引:1
We have developed a fundamental technique for control of important known and unknown lens aberrations. Control of lens aberrations through traditional means is very difficult in high-performance optical systems. Minimizing aberrations caused by deterministic design errors as well as statistical fabrication errors has often led to costly systems and fabrication techniques. By employing a special-purpose optical phase mask and digital signal processing we can form imaging systems that are invariant, or substantially insensitive, to a number of important lens aberrations. 相似文献
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A technique of controlling the pitch and radius of curvature of a cylindrical lens array is presented. The lens pitch is controlled by producing the linear partition walls that sandwich a UV-curable polymer. The partition walls are created by scratching a polymeric substrate with a sharp edge. The radius of curvature can be controlled by designating the volume of the UV-curable polymer dispensed between the partition walls that prevent the spreading of the polymer due to the pinning effect. This technique can contribute to realizing a practical fabrication method for cylindrical lens arrays owing to its simplicity and flexibility. 相似文献
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利用相位模板实现数字全息超分辨成像 总被引:2,自引:2,他引:0
为了简化数字全息超分辨记录系统,分别在其物光和参考光部分引入一块相位模板,以获得垂直和倾斜方向照明物体的光束和具有不同载波频率的参考光束.当这些具有不同照射方向的光透过物体后,可以使CCD在位置固定的情况下记录到携带低频和高频信息的物体衍射场,不同载波频率的参考光则保证了高频和低频信息在复合全息图的频谱面上能够相互分离.实验结果证明,通过将记录到的物体高频和低频信息合成,可以获得超出系统衍射极限分辨率的再现像. 相似文献