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太赫兹数字全息术的研究进展

石敬 王新柯 郑显华 贺敬文 王森 谢振威 崔烨 叶佳声 孙文峰 冯胜飞 韩鹏 张岩

石敬, 王新柯, 郑显华, 贺敬文, 王森, 谢振威, 崔烨, 叶佳声, 孙文峰, 冯胜飞, 韩鹏, 张岩. 太赫兹数字全息术的研究进展[J]. 中国光学, 2017, 10(1): 131-147. doi: 10.3788/CO.20171001.0131
引用本文: 石敬, 王新柯, 郑显华, 贺敬文, 王森, 谢振威, 崔烨, 叶佳声, 孙文峰, 冯胜飞, 韩鹏, 张岩. 太赫兹数字全息术的研究进展[J]. 中国光学, 2017, 10(1): 131-147. doi: 10.3788/CO.20171001.0131
SHI Jing, WANG Xin-ke, ZHENG Xian-hua, HE Jing-wen, WANG Sen, XIE Zhen-wei, CUI Ye, YE Jia-sheng, SUN Wen-feng, FENG Sheng-fei, HAN Peng, ZHANG Yan. Recent advances in terahertz digital holography[J]. Chinese Optics, 2017, 10(1): 131-147. doi: 10.3788/CO.20171001.0131
Citation: SHI Jing, WANG Xin-ke, ZHENG Xian-hua, HE Jing-wen, WANG Sen, XIE Zhen-wei, CUI Ye, YE Jia-sheng, SUN Wen-feng, FENG Sheng-fei, HAN Peng, ZHANG Yan. Recent advances in terahertz digital holography[J]. Chinese Optics, 2017, 10(1): 131-147. doi: 10.3788/CO.20171001.0131

太赫兹数字全息术的研究进展

doi: 10.3788/CO.20171001.0131
基金项目: 

国家重点基础研究发展计划(973计划)资助项目 2013CBA01702

国家自然科学基金资助项目 11474206

国家自然科学基金资助项目 91233202

国家自然科学基金资助项目 11374216

国家自然科学基金资助项目 11404224

教育部新世纪优秀人才资助项目 NCET-12-0607

北京市教委科技面上项目 KM201310028005

教育部博士点基金资助项目 20121108120009

北京市教委青年拔尖人才资助项目 CIT & TCD201504080

详细信息
    作者简介:

    石敬(1989-), 女, 北京人, 博士研究生, 主要从事太赫兹成像方面的研究。E-mail:867895903@qq.com

    通讯作者:

    王新柯(1982-),男,北京人,博士,副教授,研究生导师,主要从事太赫兹波谱与成像方面的研究。E-mail:wxk82721@cnu.edu.cn

  • 中图分类号: O434.3;O438.1

Recent advances in terahertz digital holography

Funds: 

Supported by National Program on Key Basic Research Projects of China 2013CBA01702

National Natural Science Foundation of China 11474206

National Natural Science Foundation of China 91233202

National Natural Science Foundation of China 11374216

National Natural Science Foundation of China 11404224

Program for New Century Excellent Talents in University, Ministry of Education of China NCET-12-0607

Scientific Research Project of Beijing Education Commission KM201310028005

Specialized Research Fund for the Doctoral Program of Higher Education 20121108120009

Scientific Research Base Development Program of the Beijing Municipal Commission of Education and the Beijing youth top-notch talent training plan CIT & TCD201504080

  • 摘要: 随着太赫兹成像技术的不断成熟,其空间分辨率和系统信噪比逐渐提高,成像速度逐渐加快,光学信息获取能力逐渐变强,人们对太赫兹成像在基础研究和工业应用的开发也逐渐深入。本文综述了近年来科研人员利用太赫兹数字全息成像系统进行的部分研究工作,包括对平板太赫兹元件的性能表征、对光控太赫兹元件的功能验证、对衍射太赫兹场中的纵向分量进行观测、以及对金属亚波长器件的太赫兹表面波进行分析。这些工作的完成对于太赫兹集成系统的研究和太赫兹成像技术的应用都具有积极的推动作用。
  • 图  1  太赫兹数字全息成像系统

    Figure  1.  Terahertz (THz) digital holographic imaging system

    图  2  太赫兹涡旋相位板及成像结果。(a) V型天线结构单元设计图;(b)8种不同参数V型天线,相邻天线的相位调制相差π/4;(c)太赫兹涡旋相位板样品图;(d)拓扑荷数l=1的太赫兹涡旋光束振幅分布;(e)相应太赫兹场相位分布;(f)和(g)为拓扑荷数l=2和l=3的太赫兹场相位分布;(h)测量太赫兹涡旋光束聚焦过程的实验系统;(i)和(j)为实验测得的距离焦点位置-10 mm、0 mm、10 mm处太赫兹光束振幅和相位分布;(k)为利用Laguerre-Gaussian模型所模拟的太赫兹场相位分布

    Figure  2.  THz vortex phase plate and imaging results. (a) Schematics of a V-shaped antenna phase modulation unit. (b) Eight kinds of V-shaped antenna structures corresponding to phase shifts with a π/4 interval. (c) Photography of the designed vortex phase plate. (d) Measured amplitude distribution of the generated THz vortex beam with l=1. (e) Corresponding phase distribution. (f) and (g) are the measured phase distributions of the THz vortex fields with l=2 and l=3. (h) Experimental setup for observing the focusing process of the THz vortex beam. (i) and (j) are the amplitude and phase maps of the measured THz vortex beam with Z=-10 mm, 0 mm, and 10 mm. (k) The simulated phase distributions by using the Laguerre-Gaussian module

    图  3  基于超表面太赫兹平板透镜的偏振选择性聚焦与成像。(a)太赫兹平板透镜实物图,插图展示了棒形天线的结构单元;(b)偏振选择性聚焦示意图;(c)~(e)对应右旋圆偏振(RCP)、左旋圆偏振(LCP)和水平线偏振太赫兹入射场,在焦平面上出射0.75 THz太赫兹光场强度分布;(f)~(h)相应的出射太赫兹光场在X-Z平面上的聚焦效果;(i)成像测试样品;(j)~(l)对应RCP、LCP和水平线偏振太赫兹入射场的0.75 THz成像结果

    Figure  3.  Polarization-selected focusing and imaging based on a metasurface THz planar lens. (a) Photograph of the THz planar lens. The inset shows the schematics of a bar antenna unit. (b) Procedure of spin-selected focusing. (c)-(e) Intensity images of the 0.75 THz component on the focal plane for a right circularly polarized (RCP), left circularly polarized (LCP), and horizontally linearly polarized THz incident fields. (f)-(h) Corresponding longitudinal focusing processes of transmitted THz fields on the X-Z plane. (i) Imaging test sample. (j)-(l) Imaging results of 0.75 THz components for RCP, LCP and horizontally linearly polarized THz incident fields

    图  4  全光可控虚拟太赫兹波带片。(a)光控太赫兹数字全息成像系统,插图展示了波带片实物图;(b)随太赫兹波与控制光之间时间延迟而变化的太赫兹峰值信号曲线;(c)和(d)为在-10 ps和10 ps时间延迟位置的1 THz强度图像;(e)为在波带片图像放大率为R=1.12、1.00、0.91时,0.8 THz、1.0 THz和1.2 THz分量的强度图像;(f)成像测试样品实物图;(g)相应的太赫兹成像结果

    Figure  4.  All-optical steerable virtual THz Fresnel zone plate (FZP). (a) Optical tunable THz digital holographic imaging system. The inset shows the photograph of the FZP. (b) Variation of the THz peak signal with the time delay between the THz and control beams. (c) and (d) present the 1.0 THz intensity images with the time delays of -10 ps and 10 ps. (e) THz intensity images of 0.8 THz, 1.0 THz and 1.2 THz components for three FZP patterns with the amplification ratios R=1.12, 1.00, 0.91. (f) Photographs of imaging samples, (g) Corresponding imaging results

    图  5  空间太赫兹调制器。(a)空间太赫兹调制器概念图;(b)实验系统图;(c)“C”、“N”和“U”的离轴太赫兹计算全息图;(d)1 THz一级衍射分量强度图;(e)利用空间太赫兹调制器生成的拓扑荷数l=1、l=2和l=3太赫兹涡旋光束强度图;(f)太赫兹涡旋光束相位分布图

    Figure  5.  Spatial THz Modulator (STM). (a) Prototype of the STM. (b) Experimental configuration of the STM. (c) Off-axis THz computer-generated holograms for letters "C", "N", and "U", respectively. (d) Corresponding intensity distributions of first-order diffraction components at 1 THz. (e) Intensity patterns of THz vortex beams with topological numbers l=1, l=2, and l=3 generated by using the STM. (f) Corresponding the phase patterns of the THz vortex beams

    图  6  光控太赫兹矢量光束的生成与表征。(a)光控太赫兹矢量光束产生原理图;(b)太赫兹矢量光束表征系统;(c)和(d)为径向偏振太赫兹光束在xyr分量的振幅和相位模拟结果;(e)和(f)为径向偏振太赫兹光束在xyr分量振幅和相位的实验测量结果

    Figure  6.  Generation and characterization of optical steerable THz vector beams. (a) Schematic for generating an optical-tunable THz vector beam. (b) Characterization system of THz vector beams. Simulated (c) amplitude and (d) phase distributions of x, y, and r components of a radially polarized THz beam. Measured (e) amplitude and (f) phase patterns of x, y, and r components of a radially polarized THz beam

    图  7  太赫兹衍射场纵向分量重建。(a)实验系统图;(b)线偏振太赫兹光束聚焦,其纵向分量的振幅和相位分布;(c)利用Richards-Wolf公式得到的模拟结果;(d)圆偏振太赫兹光束聚焦,其纵向分量的振幅和相位分布;(e)相应的模拟结果

    Figure  7.  Reconstruction of the Ez component of a THz diffraction field. (a) Experimental system. (b) Amplitude and wrapped phase distributions of the Ez component for a converging THz beam with a linear polarization. (c) Simulation results obtained by using the Richards-Wolf equation. (d) Amplitude and wrapped phase maps of the Ez component for a focused THz beam with a circular polarization. (e) Corresponding simulation result

    图  8  金属等离子体器件的太赫兹表面波再现。(a)实验系统图,插图展示了测试样品;(b)太赫兹表面波时域峰值图像;(c)在x=0 mm方向上y=-1 mm、-0.5 mm、0 mm、0.5 mm、1 mm位置处的太赫兹时域信号;(d)0.73 THz太赫兹表面波的振幅分布图;(e)利用FDTD算法得到的模拟结果;(f)和(g)展示了归一化横向和纵向振幅轮廓曲线;(h)0.73 THz表面太赫兹波的相位分布图;(i)相应的模拟结果;(j)不同光谱成分太赫兹表面波的纵向相位轮廓曲线;(k)相应的模拟结果

    Figure  8.  Reconstruction of THz surface waves on metallic plasmon devices. (a) Experimental setup. The inset shows the test sample. (b) The temporal peak image of the THz surface wave. (c) The temporal THz signals measured at y=-1 mm, -0.5 mm, 0 mm, 0.5 mm, and 1 mm along the x=0 mm direction. (d) Amplitude distribution of the THz surface wave at 0.73 THz. (e) Simulation result by using the FDTD algorithm. (f) and (g) show the normalized transverse and longitudinal amplitude profile curves. (h) Phase distribution of the THz surface wave at 0.73 THz. (i) Corresponding simulation result. (j) Longitudinal phase profile curves for THz surface waves with difference spectral components. (k) Corresponding simulation result

    图  9  太赫兹表面波偏振选择性聚焦。(a)太赫兹表面波成像系统,插图为样品示意图;(b)和(c)为LCP和RCP入射光激发的太赫兹表面波聚焦过程振幅分布图;(d)和(e)为图(b)和(c)中截取的x=0 mm处振幅分布曲线;(f)和(g)为LCP和RCP入射光激发的太赫兹表面波聚焦过程相位分布图;(h)为图(f)和(g)中截取的x=-2 mm处相位分布曲线;(i)相位相减分布曲线;(j)y偏振入射光激发的太赫兹表面波振幅分布图;(k)相应的数值模拟结果;(l)和(m)为在图(j)和(k)中截取的x=0 mm处振幅和相位分布曲线

    Figure  9.  Polarization-controlled focusing of THz surface waves. (a) THz surface waves imaging system. The inset shows the schematic of the sample. (b) and (c) present the amplitude distributions of converging THz surface waves excited by LCP and RCP THz incident fields. (d) and (e) show the amplitude profile curves along x=0 mm taken from (b) and (c). (f) and (g) present the phase patterns of focused THz surface waves excited by LCP and RCP THz incident fields. (h) shows the phase profile curves along x=-2 mm extracted from (f) and (g). (i) Curve of the subtraction phase. (j) Amplitude map of the THz surface wave excited by a linearly y-polarized THz incident field. (k) Corresponding simulation result. (l) and (m) present the amplitude and phase curves along x=0 mm taken from (j) and (k)

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出版历程
  • 收稿日期:  2016-09-12
  • 修回日期:  2016-10-14
  • 刊出日期:  2017-02-25

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