A frequency-tunable graphene wide-angle terahertz absorber
A graphene and wave absorber technology, applied in the field of terahertz wave absorption, can solve the problems of small absorption rate frequency and angle adjustment range, and achieve the effect of simple structure and easy biasing
Inactive Publication Date: 2019-09-20
XIAMEN UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem of the graphene wave absorber in the prior art that the absorption frequency and angle adjustment range of the graphene wave absorber are small, and to provide a large-scale adjustment of the absorption frequency of the wide-angle incident terahertz wave Frequency-tunable graphene wide-angle terahertz absorber
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[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific examples.
[0020] An example of the present invention is figure 1 with 2 As shown, a frequency-tunable graphene wide-angle terahertz absorber is a five-layer structure device, from top to bottom: upper graphene strip layer 1, upper dielectric layer 2, and lower graphene strip layer It consists of a tape layer 3, a lower dielectric layer 4, and a metal substrate layer 5; the frequency-tunable graphene wide-angle terahertz absorber has a periodic unit structure in the xoy plane, and the period lengths in the x and y directions are respectively for L x and L y , where: the upper graphene strip layer 1 is composed of a width of W u , with length L x Composed of rectangular ribbon-shaped graphene; the upper dielectric layer 2 has a thickness of h 1 Made of low dielectric constant materials, such as: Sio 2 , Topas, Zro 2 etc.; the lower graphene strip lay...
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Abstract
The invention provides a frequency-adjustable graphene wide angle terahertz wave absorbing device, and relates to terahertz wave absorbing. The frequency-adjustable graphene wide angle terahertz waveabsorbing device is a device with a five-layer structure which is composed of an upper graphene band layer, an upper dielectric layer, a lower graphene band layer, a lower dielectric layer and a metalsubstrate layer, wherein periodicity exists in the xoy plane, and the upper graphene band layer consists of rectangular-band-shaped graphene; the upper dielectric layer is formed by low dielectric constant materials; the lower graphene band layer is formed by rectangular-band-shaped graphene; the lower dielectric layer is formed low dielectric constant materials; the thickness of the metal substrate layer is greater than the skin depth of the incoming wave; and the lower graphene band layer and the upper graphene band layer are perpendicular to each other and are isolated by the upper dielectric layer.
Description
technical field [0001] The invention relates to terahertz absorbers, in particular to a graphene wide-angle terahertz absorber with adjustable frequency. Background technique [0002] Terahertz waves generally refer to electromagnetic waves with a frequency of 0.1-10THz, and the corresponding wavelength range is 3-0.03mm[1-2]. Broad application prospects. Since Landy et al. proposed a perfect metamaterial absorber in 2008 (Phys.Rev.Lett., vol.100, pp.207402, 2008), the research on terahertz metamaterial absorber has attracted people's attention. great concern. The sub-wavelength metal microstructure array layer-dielectric layer-metal layer sandwich structure is a typical structure of metamaterial absorbers, which can suppress the transmission and reflection channels by utilizing the subwavelength metal array layer structure, the ohmic loss of the metal layer and the Dielectric absorption achieves perfect absorption of incident electromagnetic waves. However, due to the u...
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IPC IPC(8): G02B5/00
Inventor 叶龙芳曾芳刘颜回张淼柳清伙
Owner XIAMEN UNIV