光学
太赫兹辐射
全息术
合成孔径雷达
迭代重建
材料科学
物理
计算机科学
人工智能
作者
Zeyu Li,Ruijiao Zou,Weipeng Kong,Xuemin Wang,Qinghua Deng,Qiang Yan,Yu Qin,Weidong Wu,Xun Yu Zhou
出处
期刊:Photonics Research
[The Optical Society]
日期:2019-11-14
卷期号:7 (12): 1391-1391
被引量:16
摘要
We demonstrate high-resolution and high-quality terahertz (THz) in-line digital holography based on the synthetic aperture method. The setup is built on a self-developed THz quantum cascade laser, and a lateral resolution better than 70 μm (∼λ) is achieved at 4.3 THz. To correct intensity differences between sub-holograms before aperture stitching, a practical algorithm with global optimization is proposed. To address the twin-image problem for in-line holography, a sparsity-based phase retrieval algorithm is applied to perform the high-quality reconstruction. Furthermore, a new autofocusing criterion termed “reconstruction objective function” is introduced to obtain the best in-focus reconstruction distance, so the autofocusing procedure and the reconstruction are unified within the same framework. Both simulation and experiment prove its accuracy and robustness. Note that all the methods proposed here can be applied to other wavebands as well. We demonstrate the success of this THz synthetic aperture in-line holography on biological and semiconductor samples, showing its potential applications in bioimaging and materials analysis.
科研通智能强力驱动
Strongly Powered by AbleSci AI