动态可重构的高效太赫兹超表面全息图

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI:10.1051/EPJAM/2020012
Mengyuan Hu, Z. Tian
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引用次数: 0

摘要

本文提出了一种反射式、动态可重构、高效的超表面全息方案,该方案是用结构飞秒激光器抽运薄砷化镓片实现的。当太赫兹(THz)光通过砷化镓晶圆(GaAs)时,泵浦光携带的图案被转换成砷化镓晶圆上光载流子密度分布的复介电常数,从而调制晶圆,从而改变太赫兹波的透射率。利用Pancharatnam-Berry (P-B)相位原理,通过改变DMD上投影谐振腔的形状和方向来确定太赫兹波束的波前。数值模拟结果表明,通过在DMD上动态切换投影可以获得不同的全息图,圆偏振光的正交转换效率可达90%。本文提出的全息方案方便快捷,可促进全息图的实时动态转换和动态显示。
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Dynamically reconfigurable high-efficiency terahertz metasurface holograms
A reflective, dynamically reconfigurable, high-efficiency metasurface holographic scheme is presented in this paper, which is realized by pumping thin gallium arsenide wafers with a structured femtosecond laser. When the terahertz (THz) passes through the gallium arsenide wafer (GaAs), the pattern carried by the pump light is converted into the complex permittivity of the light carrier density distribution on the gallium arsenide wafer, which modulates the wafer, thereby changing the transmittance of the THz wave. The wavefront of the THz beam is determined by changing the shape and direction of the projected resonator on the DMD by Pancharatnam-Berry (P-B) phase principle. The numerical simulation results show that different holograms can be obtained by dynamically switching the projection on the DMD, and the orthogonal conversion efficiency of circularly polarized light can reach 90%. The holographic scheme proposed in this paper is convenient and fast and may advance the real-time dynamic conversion and dynamic display of holograms.
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来源期刊
EPJ Applied Metamaterials
EPJ Applied Metamaterials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.10
自引率
6.20%
发文量
16
审稿时长
8 weeks
期刊最新文献
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