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Active terahertz spin Hall effect in vanadium dioxide metasurfaces
Optics Express ( IF 3.2 ) Pub Date : 2021-03-05 , DOI: 10.1364/oe.421283
Lei Kang 1 , Yuhao Wu 1 , Douglas H. Werner 1
Affiliation  

Insulator-to-metal transition induces large material property variations in vanadium dioxide (VO2) over a broad frequency band. VO2, therefore, has been introduced into metallic resonating structures to realize reconfigurable metadevices from microwave to optical wavelengths. Beyond enabling metal/VO2 hybrid meta-atoms, in the THz regime metallic-phase VO2 micro-structures can support strong electromagnetic resonances, offering great potential in active manipulation of THz radiation. In this paper, we show that VO2 dipole antennas can be used to realize geometric phase coded metasurfaces for wave-front shaping and polarization rotation of THz waves. Moreover, we demonstrate that the corresponding efficiency of the THz spin Hall effect is closely related to VO2’s THz electrical conductivity. In light of the dispersionless nature of the geometric phase, our study indicates that metasurfaces constructed by VO2 subwavelength resonators are good candidates for active control of broadband THz radiation.

中文翻译:

二氧化钒超颖表面的主动太赫兹自旋霍尔效应

绝缘体到金属的过渡会在很宽的频带内引起二氧化钒(VO 2)的较大的材料性能变化。因此,VO 2已被引入到金属谐振结构中,以实现从微波到光波长的可重构元设备。除了使金属/ VO 2杂化原子成为可能之外,在太赫兹状态下,金属相VO 2微观结构还可以支持强大的电磁共振,为主动控制太赫兹辐射提供了巨大的潜力。在本文中,我们表明VO 2偶极天线可用于实现几何相位编码超表面,以进行波前成形和太赫兹波的极化旋转。此外,我们证明了THz自旋霍尔效应的相应效率与VO 2的THz电导率密切相关。根据几何相位的无色散性质,我们的研究表明,由VO 2亚波长谐振器构成的超表面是主动控制宽带THz辐射的良好候选者。
更新日期:2021-03-15
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