Multifunctional ultrawideband terahertz metasurfaces with full space modulation

IF 4.6 2区 物理与天体物理 Q1 OPTICS
Lei Fan, Wangting Fu, Shan Huang, Xingfang Luo
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Abstract

In the field of metasurface technology, it is a major challenge to realize full-space multifunctional integration under ultra-wide bandwidth. In this study, we propose an innovative full-space terahertz (THz) metasurface design strategy that utilizes the cascaded mirror Fabry-Perot (F-P) cavity structure combined with the phase transition properties of vanadium dioxide (VO2) to realize dynamic functional modulation of the metasurface in full space over an ultra-wide bandwidth. The proposed metasurface demonstrates exceptional capabilities within the 0.9–1.9 THz range, including polarization conversion (PC) for both linearly and circularly polarized waves in reflection mode, linear-to-circular polarization conversion (LTCPC), asymmetric transmission (AT), and circular dichroism (CD). Particularly noteworthy is the ability of the metasurface to work not only on transmission or reflection space alone, but also to modulate both spaces simultaneously. In order to demonstrate its full-space modulation capability in a wide bandwidth, the generation of a focused vortex beam is realized in the upper surface, and high-quality imaging is achieved in the lower surface space. Meanwhile, by adjusting the relative rotation angles of the metal layer structures, efficient PC is achieved in the reflection space and circular dichroism is exhibited in the transmission space. This design, characterized by full-space tunability and multifunctionality, offers innovative approaches for THz device integration and application while providing valuable insights for future optical device design.
全空间调制的多功能超宽带太赫兹超表面
在超宽带宽下实现全空间多功能集成是超表面技术领域的一大挑战。在这项研究中,我们提出了一种创新的全空间太赫兹(THz)超表面设计策略,该策略利用级联镜法布里-珀罗(F-P)腔结构结合二氧化钒(VO2)的相变特性,实现了超宽带宽下全空间超表面的动态功能调制。所提出的超表面在0.9-1.9太赫兹范围内表现出卓越的能力,包括反射模式下线性和圆极化波的偏振转换(PC)、线性到圆极化转换(LTCPC)、不对称传输(AT)和圆二色性(CD)。特别值得注意的是,超表面不仅可以单独作用于传输或反射空间,还可以同时调制这两个空间。为了展示其在宽带宽下的全空间调制能力,在上表面实现了聚焦涡旋光束的产生,在下表面空间实现了高质量的成像。同时,通过调整金属层结构的相对旋转角度,在反射空间实现高效PC,在透射空间实现圆二色性。该设计具有全空间可调性和多功能性,为太赫兹器件集成和应用提供了创新方法,同时为未来的光学器件设计提供了有价值的见解。
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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