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Terahertz synthetic aperture in-line holography with intensity correction and sparsity autofocusing reconstruction [Cover Paper]

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Abstract

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.

Newport宣传-MKS新实验室计划
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DOI:10.1364/PRJ.7.001391

所属栏目:Holography, Gratings, and Diffraction

基金项目:National Natural Science Foundation of China10.13039/501100001809; National Key Scientific Instrument and Equipment Development Projects of China10.13039/501100012149;

收稿日期:2019-07-23

录用日期:2019-09-30

网络出版日期:2019-11-14

作者单位    点击查看

Zeyu Li:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, Chinae-mail: lzy.robin@foxmail.com
Ruijiao Zou:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Weipeng Kong:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Xuemin Wang:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Qinghua Deng:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Qiang Yan:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Yu Qin:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Weidong Wu:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
Xun Zhou:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaMicrosystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China

联系人作者:Xun Zhou(zcm_zx_zky@163.com)

备注:National Natural Science Foundation of China10.13039/501100001809; National Key Scientific Instrument and Equipment Development Projects of China10.13039/501100012149;

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引用该论文

Zeyu Li, Ruijiao Zou, Weipeng Kong, Xuemin Wang, Qinghua Deng, Qiang Yan, Yu Qin, Weidong Wu, and Xun Zhou, "Terahertz synthetic aperture in-line holography with intensity correction and sparsity autofocusing reconstruction," Photonics Research 7(12), 1391-1399 (2019)

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