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相干衍射成像是近20年才发展起来的一种高分辨率计算成像技术. 其原理是通过采集相干光照明时样品产生的衍射图样, 使用相位恢复算法计算实现样品结构的三维(3D)成像. 区别于传统成像技术, 该技术具有多个显著优势: 1) 成像分辨率接近于照明光源波长; 2) 成像系统简单, 无需使用成像镜头, 成像系统通常由相干光源、样品和CCD组成; 3) 无相差、色差, 极紫外光子利用率高: 使用计算成像, 避免了引入器件的折射、反射和吸收等效应造成的相差和色差以及光子利用效率下降. 自上世纪末, 基于大型相干极紫外和X射线光源的相干衍射成像技术发展迅速, 已达亚纳米级分辨率. 此后, 随着飞秒激光高次谐波技术的成熟, 相干极紫外和X射线光源的体积和成本大幅度降低, 相干衍射成像技术得到进一步发展和推广. 发展至今日, 基于高次谐波的相干衍射成像技术已经成为一种有巨大应用潜力的纳米成像技术, 为半导体材料和器件表面形貌、生物微结构及动态演化、半导体和量子器件的化学成分及浓度分布、物理或化学动态过程以及量子状态等领域的探测成像提供了一种有效的技术方案, 并开始在高分辨率半导体检测领域中获得实际应用. 相信不久的将来, 基于高次谐波相干衍射成像技术将成为纳米量级显微成像技术的杰出代表, 成为和现有的原子力、近场光学、X射线、电子以及隧道扫描等显微成像相媲美的主流技术. 本文回顾了相干衍射成像及其照明光源技术的发展历程, 介绍了相干衍射成像技术现状和发展趋势, 然后说明高次谐波光源和相干衍射成像技术原理, 最后重点介绍了几种可以利用高次谐波的高相干、短波长、短脉冲及梳状超宽谱特性的衍射成像技术: 探针强度约束、反射模式、频闪照相、多模态叠层、单次曝光叠层、时间分辨多路复用叠层、角度扫描相敏成像等技术.Coherent diffractive imaging (CDI) using ultra-short wavelength light source has become an three-dimensional(3D) nanoimaging technique. In CDI, a target sample is first illuminated by a coherent EUV and soft X-ray light, then the diffraction pattern is recorded by using a charge coupled device (CCD), and finally the image of the sample is obtained based on the pattern by using a phase retrieval algorithm. Of the many currently available coherent EUV and soft X-ray light sources, the high-order harmonic generation (HHG) is the simplest in structure, the lowest in cost, and most compact in size. Therefore, it has become the most promising light source for CDI. Through years of development, HHG based CDI technique(HHG-CDI) has become an outstanding 3D nano-imaging technique with the advantages of no aberration, no damage, and no contact either, and it also possesses the extra-capabilities of probing the dynamics, chemical composition and quantum information in various semiconductor and quantum devices. We believe that the HHG-CDI will soon become a generic nano-imaging tool that can complement or even replace the matured nanoimaging techniques, such as atomic force, near field, X-ray, electron, or scanning tunneling microscopes.
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Keywords:
- high order harmonic generation /
- phase retrieval /
- coherent diffraction imaging /
- reflection mode imaging /
- X-ray laser /
- 3D imaging
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图 3 HHG产生的“三步模型”. 原子势垒会被激光场调制, 电子发生隧穿电离; 然后在激光电场加速; 随着电场反向, 电离电子与母核复合, 把获得能量以HHG光子辐射 (制作本图参考了文献 [49] )
Fig. 3. The illustration of the three-step Model. The tunneling ionization can occur as the atomic barrier is modulated by the laser field. Then the electron is accelerated in the electric field; As the electric field is reversed, the ionized electron recombines with the parent nucleus and radiates its energy as HHG photons,Figure reproduced from Ref. [49]
图 7 凸集映射示意图, 一个随机猜测投影到检测器平面约束集, 然后投影到样本平面约束集, 完成一个更新周期. 多次迭代后, 找到两个约束集的交点: 真解
Fig. 7. Diagram of convex-set mapping, a random guess is first projected to the detector plane constraint set, then to the sample plane constraint set to finish a full updating cycle. After many iterations, the solution is found at the intersection of the two constraint sets.
图 13 反射模式相干衍射成像 (a) CCD上的实测衍射图; (b)采用校正算法, 提取图(a)中每个衍射峰的值, 重采样衍射图; (c)重建显示所有照明柱的平均值; (d)类似柱状结构的原子力显微镜图像[15]
Fig. 13. Reflection-mode coherent diffraction imaging: (a) measured diffraction pattern on CCD; (b) resampled diffraction pattern in panel (a); (c) reconstruction showing the average of all illuminated pillars; (d) atomic force microscope image of similar pillar structures[15].
图 14 实验装置、衍射数据和Ptychography重建结果 (a) 90次扫描数据集的代表性衍射图样; (b) SEM像; (c)探针重建; (d)样品重建[16]
Fig. 14. Experimental setup for reflection-mode ptychography, diffraction data and ptychographic reconstruction: (a) Representative diffraction pattern taken from the 90-scan dataset; (b) SEM image of the sample; (c) reconstructed amplitude of the HHG beam; (d) Ptychographic reconstruction of the object[16].
图 15 (a)频闪CDI动态成像实验布局示意图; (b)在每个时间延迟时, 用Ptychography获得样本的图像; (c)不同时间延迟下动态成像实验; (d)硅基镍纳米线的衍射图; (e)衍射效率作为泵浦探测延迟时间的函数的瞬态信号图[24]
Fig. 15. (a) Schematic of the experimental layout for dynamic imaging on a tabletop; (b) tt every time delay, the image of the sample is obtained with Ptychographic CDI; (c) general concept of dynamic imaging experiment; (d) diffraction pattern of the Nickel lines on Silicon; (e) plot of the transient signal from diffraction efficiency as a function of pump-probe delay time[24].
图 16 单个纳米结构中声波的动态成像. (a)频闪CDI显微镜动态成像实验装置; (b)重建样品振幅图像; (c)重建样品相位得到的高度图; (d)—(i) 重建镍纳米结构热膨胀和随后声波在基板中传播的快照[32]
Fig. 16. Dynamic imaging of acoustic waves in an individual nanostructure: (a) Stroboscopic CDI microscope for dynamic imaging; (b) reconstructed quantitative amplitude image; (c) height map of the sample obtained from the reconstructed phase image; (d)–(i) ieconstructed snapshots of the nickel nanostructure thermal expansion and subsequent propagation of acoustic waves in the substrate[32]
图 18 结合HHG多次极紫外谐波的多光谱衍射成像 (a), (b) 6波长非扫描透射成像模式[82]; (c), (d) 4波长的叠层扫描反射成像模式[83]
Fig. 18. Hyperspectral imaging by combining multiple EUV harmonics and PIM: (a), (b) a 6-wavelength non-scanning transmission mode CDI[82]; (c), (d) a ptychographic hyperspectral spectromicroscopy with a 4-wavelength comb[83].
图 21 使用OAME重建9个复值对象和探针 (a)单架照相机抓拍所记录的强度图样;(b)重建帧复值对象和探头, 每帧分为4个区域(如第一帧):左上为物体振幅, 右上为物体相位, 左下为探头振幅, 右下为探头相位[27]
Fig. 21. Reconstruction of 9 complex-valued objects and probes using OAME: (a) The intensity pattern recorded in a single camera snapshot; (b) reconstructed frames - complex-valued objects and probes. Each frame is divided to 4 quarters (as marked on the first frame): top-left is object amplitude, top-right is object phase, bottom left is probe amplitude and bottom-right is probe phase[27].
图 23 纳米结构成像 (a)幅值和相位敏感成像反射仪的原理图; (b), (c)实施3D倾斜平面校正和全变分正则化处理和未作相应处理的相位重建; (d)宽视场振幅重建; (e) (f)材料的特征反射率与角度曲线—EUV光对材料成分的敏感性[30]
Fig. 23. Experiment overview and nanostructure imaging: (a) Schematic of the amplitude- and phase-sensitive imaging reflectometer. Zoom-in of EUV ptychographic phase reconstructions of the sample, (b) before and (c) after precise implementation of 3D tilted-plane correction and total variation (TV) regularization. (d) Entire, wide field-of-view amplitude reconstruction. (e), (f) Characteristic reflectivity versus angle curves for several materials, showing the sensitivity of EUV light to material composition[30].
图 24 空间分辨、组成敏感和三维纳米结构表征 (a)高掺杂结构, (b)低掺杂衬底和(c)高掺杂衬底中的成分与深度重建; (d)全重构样品的放大(插图); (e) Ptychography相位图像与遗传算法结果相结合得到的结果; (f)同一区域的AFM图像[30]
Fig. 24. Spatially resolved, composition-sensitive, 3D nanostructure characterization: Composition versus depth reconstruction in the (a) higher-doped structures, (b) lower-doped substrate, and (c) higher-doped substrate; (D) zoom-out and zoom-in (inset) of fully reconstructed sample; (e) topography map obtained by combining the ptychographic phase image with the results of the genetic algorithm; (f) AFM image of the same region[30].
表 1 半导体器件技术领域常用的几种纳米成像技术和相干衍射成像技术的对比
Table 1. Comparison of several nano-imaging techniques commonly used in semiconductor technology.
纳米成像
技术分辨率/nm 光源 镜头 样品损伤/
预处理表面3D
形貌镀层下结构/
层厚度检测化学成分/浓度 成像
速度光学显微镜 ~100 红外, 可见光 透镜 无损伤无需处理 可探测 部分可探测/
透明料可以可探测/半
导体不可快 X射线显微镜 ~20 SRS, XFEL 波带片 有损伤
无需处理不能探测 均可实现 可探测 慢 扫描电子显微镜 ~0.1 电子束 磁透镜 有损伤
需处理可探测 金属层不可/厚度不可 无法探测 较慢 原子力显微镜 ~0.1 nm 无 纳米探针 无损伤
无需处理可探测 无法探测 无法探测 最慢 HHG-CDI <10 nm SRS, FEL.HHG 无透镜 无损伤无需处理 可探测 均可探测 可探测 快 -
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