武汉光电论坛第146期

报告题目：太赫兹波前获取与调控

Acquisition and Modulation of Terahertz Wave Front

时 间：2018年9月7日10:00-12:00

地 点：光电国家研究中心A101

报 告 人：张 岩 教授，首都师范大学

邀 请 人：张新亮 教授

报告人简介：

张岩，首都师范大学教授，超材料与器件北京市重点实验室主任。1999年获得中科院物理所光学博士学位，先后在日本山形大学，香港理工大学，德国斯图加特大学，香港科技大学，美国伦斯特理工大学以及德国康斯坦茨大学从事合作研究。目前主要从事太赫兹波谱与成像，超构表面器件等方面研究，发表SCI期刊论文220余篇，Google H因子38。

Biography:

Prof. Dr. Yan Zhang, director of Beijing Key Lab for Matematerials and Devices. He was elected to the Program for New Century Excellent Talents in University, Beijing Science Nova Program, Beijing BaiQianWan Talents Program, and Beijing Great Wall Scholar.

Prof. Zhang received his bachelor and master degrees from Harbin Institute of Technology and doctor degree from Institute of Physics, Chinese Academy of Science. He has worked in Yamagata University, Japan, Hong Kong Polytechnic University, Stuttgart University, Germany, Hong Kong University of Science and Technology, Rensselaer Polytechnic Institute, USA, and University Konstanz, Germany. His research interests include terahertz imaging and spectroscopy, surface plasmonic optics, optical information processing. He has published more than 220 prereviewed papers and delivered more than 30 invited talks.

报告摘要：

太赫兹辐射具有很多独特的优点，在通讯和成像领域具有重要的应用。相比太赫兹的源和探测器，太赫兹的功能器件都还不成熟，阻碍了太赫兹技术的广泛应用。本报告介绍首都师范大学超材料与器件北京市重点实验室在太赫兹波前获取和调控方面取得的进展。利用自主研发的太赫兹脉冲波焦平面成像系统实现太赫兹辐射的频率、振幅、相位以及偏振态的测量，并利用这套系统实现对涡旋光束和太赫兹波段表面等离子体器件的的表征。利用超构表面技术实现太赫兹波前的调控，设计了超薄太赫兹平板透镜，长焦深透镜，多焦点透镜、太赫兹全息、分色成像全息以及偏振选择透镜等器件。并利用半导体材料在太赫兹波段特殊的光电调控特性，提出了太赫兹波前调制器，实现了基于动态超构表面的太赫兹波前调控。

Abstract:

Due to many unique advantages of terahertz radiation, it has important potential applications in the field of communication and imaging. Compared with the sources and detectors of terahertz, the functional devices of terahertz are still immature, which hinders the wide application of terahertz technology. This report describes the progress of terahertz wavefront acquisition and modulation in Beijing Key Laboratory of Metamaterials and Devices, Capital Normal University. The frequency, amplitude, phase and polarization of terahertz radiation are measured by a self-developed terahertz pulsed focal plane imaging system. The vortex beam and surface plasmon devices in terahertz band are characterized by this system. The terahertz wavefront can also be modulated by metasurface technology. The ultra-thin terahertz flat lens, long focal depth lens, multi-focal lens, terahertz holography, color-splitting imaging holography and polarization-selective lens are designed. A terahertz wavefront modulator is proposed based on the photoelectric characteristics of semiconductor materials in the terahertz band, and the terahertz wavefront modulation based on the dynamic metasurface is also realized.

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