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首页> 外文期刊>Journal of optics >Graphene based ultra-broadband terahertz metamaterial absorber with dual-band tunability
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Graphene based ultra-broadband terahertz metamaterial absorber with dual-band tunability

机译：基于石墨烯的超宽带太赫兹超材料吸收器，具有双频可调性

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摘要

Broadband absorbers with multiple absorption bands, adjustable properties and simple configurations in the terahertz region are quite scarce and hold competent aptitude. In this paper, we design and analyze a tunable dual and ultra-broadband metamaterial absorber for terahertz waves based on monolayer continuous structured graphene. With the aid of the variable conductivity of graphene, the designed absorber provides controllable absorption strength and bandwidth. Additionally, the monolayer continuous structure of graphene makes the metamaterial absorber simple in terms of structure and flexible tuning. The two broadband absorption occurs from 0.1-3.1 THz and 6.25-8.55 THz for different graphene chemical potentials, securing a fractional bandwidth of 187.5% and 31%, respectively, for the two bands. Furthermore, the absorber shows great tolerance towards incident angles for both transverse electric and transverse magnetic waves, and is insensitive to the polarization angle. The physical mechanism of the absorber is also analyzed and investigated via field analysis, impedance matching theory and interference theory. Overall, the proposed graphene-enabled metamaterial absorber yields possibilities in various practical applications.
机译：具有多种吸收带的宽带吸收器，可调节性能和太赫兹地区的简单配置非常稀缺，并保持称重量的能力。在本文中，我们设计并分析了基于单层连续结构石墨烯的太赫兹波的可调谐双宽带超材料吸收器。借助石墨烯的可变电导率，设计的吸收器提供可控吸收强度和带宽。另外，石墨烯的单层连续结构使得超材料吸收器在结构和灵活调谐方面变得简单。两种宽带吸收发生在0.1-3.1 ZHz和6.25-8.55六点以进行不同的石墨烯化学电位，分别为两个带的分数带宽为187.5％和31％。此外，吸收器对横向电和横向磁波的入射角显示出具有很强的耐受性，并且对偏振角不敏感。通过场分析，阻抗匹配理论和干扰理论，还分析和研究了吸收器的物理机制。总的来说，所提出的石墨烯的超材料吸收器产生各种实际应用中的可能性。

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