| 利用波矢滤波超表面实现超衍射成像 |
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| 引用本文： | 郭畅,张岩.利用波矢滤波超表面实现超衍射成像[J].物理学报,2017,66(14):147804-147804. |
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| 作者姓名： | 郭畅 张岩 |
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| 作者单位： | 首都师范大学物理系, 北京市成像技术高精尖中心, 北京市超材料与器件重点实验室, 太赫兹光电子学教育部重点实验室, 北京 100048 |
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| 基金项目： | 国家重点基础研究发展计划（批准号：2013CBA01702）、国家自然科学基金（批准号：11474206，91233202，11374216，11404224）、新世纪优秀人才项目（批准号：NCET-12-0607）和北京市教委科研项目（批准号：KM201310028005）资助的课题. |
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| 摘 要： | 超衍射成像是当前光学领域的研究热点.本文利用一种不对称分裂环超表面结构来实现超衍射成像,该结构由上下两个不对称的金属环组成,通过集体陷模共振可实现对入射光的波矢选择性透过.当物体发出或反射的光照射到超表面上时,入射角大于某一角度的入射光会被共振电场耦合吸收或反射,只有低空间频率的光波可以通过,从而减小衍射的影响,实现超衍射成像.数值模拟结果表明了这一方法的可行性.
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| 关 键 词： | 超材料 太赫兹 频率选择表面 超衍射 |
| 收稿时间： | 2017-05-17 |
Super diffraction imaging with wave vector selective metasurface |
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| Guo Chang,Zhang Yan.Super diffraction imaging with wave vector selective metasurface[J].Acta Physica Sinica,2017,66(14):147804-147804. |
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| Authors: | Guo Chang Zhang Yan |
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| Institution: | Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Key Laboratory of Metamaterials and Devices, Beijing Advanced Innovation Center for Imaging Technology, Department of Physics, Capital Normal University, Beijing 100048, China |
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| Abstract: | Super diffraction imaging has been a research hotspot for a long time. We realize the super diffraction imaging with a metasurface structure, which is consisted of asymmetrically split rings. Based on the wave vector selectivity of the metasurface, radiation can be transmitted through it only in a narrow range of the incident angular. The metasurface acts as a high frequency spatial filter, reduces the diffraction effect, and obtains the super diffraction resolution. Numerical simulation results demonstrate the validity of this method. |
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| Keywords: | metamaterials terahertz frequency selective surface super-diffraction |
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