【摘要】：隨著太赫茲(Terahertz,THz)科學的發(fā)展,太赫茲吸收器、濾波器等能改善傳輸過程和性能的功能器件引起了人們研究的熱潮。但是由于自然界中缺少對太赫茲波響應和探測的材料,嚴重制約了其發(fā)展,超材料(Metamaterials,MMs)的出現(xiàn)為研究和設計太赫茲器件提供了極大的便利。超材料可以通過改變單元周期結構的幾何參數(shù),使它的介電常數(shù)和磁導率在特定頻率范圍內(nèi)一個或者兩個同時為負值,從而改變它的電磁共振響應,因此它在電磁隱身、光電探測等方面都有極大的應用前景。相比傳統(tǒng)的吸波材料,超材料吸收器存在厚度薄、質(zhì)量輕、吸收強、頻率可控性和設計靈活性等諸多優(yōu)點,在微波段、光波段特別是在太赫茲波段引起了人們的研究熱潮。本文設計了不同類型的超材料吸收器并對其吸收特性進行研究,主要工作和創(chuàng)新點如下:1.在太赫茲波段設計一種光激勵可調(diào)諧超材料吸收器。在開口諧振環(huán)(split-ring resonators,SRRs)的關鍵區(qū)域開口處植入光敏半導體硅,通過改變外部泵浦光的光照能量,改變半導體硅的電導率,實現(xiàn)共振頻率由0.684THz到1.414THz的藍移調(diào)諧。在此基礎上研究了兩個共振頻率產(chǎn)生的機理,并著重分析了單元結構尺寸b、線寬ω、電介質(zhì)層聚酰亞胺(PI)的厚度、硅的電導率σ、材料PI的介電常數(shù)ε以及開口長度c等參數(shù)對此可調(diào)諧超材料吸收性能的影響。2.基于十字型結構,在太赫茲波段構造出單頻帶、雙頻帶以及多頻帶超材料吸收器。首先,在太赫茲波段設計出基于十字型結構的完美超材料吸收器,在1.74THz處產(chǎn)生了強的共振頻點,同時基于諧振電路理論,研究了十字型吸波器諧振頻率與其幾何參數(shù)的依賴關系。其次,在十字型結構的基礎上,上下左右各加一條金屬線條,設計出雙頻帶超材料吸收器,共振頻點分別位于0.89THz和2.18THz;最后,設計出多頻帶超材料吸收器,共振頻點分別為0.996THz、1.194THz、1.870THz、1.990THz和2.298THz。這些超材料吸收器結構簡單性能優(yōu)良,具有一定的借鑒意義和研究價值。
[Abstract]:With the development of Terahertz,THz science, terahertz absorbers, filters and other functional devices that can improve the transmission process and performance have aroused a lot of research. However, the development of terahertz (THz) devices is greatly facilitated by the appearance of metamaterials (Metamaterials,MMs) due to the lack of materials to respond and detect terahertz waves in nature. Metamaterials can change their electromagnetic resonance response by changing the geometric parameters of their periodic structures so that their permittivity and permeability are negative at the same time in a given frequency range, so that they become electromagnetic invisibility. Photoelectric detection and other aspects have great application prospects. Compared with traditional absorbing materials, metamaterial absorbers have many advantages, such as thin thickness, light weight, strong absorption, frequency controllability and design flexibility. In this paper, different types of metamaterial absorbers are designed and their absorption characteristics are studied. The main work and innovations are as follows: 1. An optically excited tunable super material absorber is designed at terahertz. The semiconductor silicon is implanted into the opening of the key region of the open resonant ring (split-ring resonators,SRRs). By changing the illumination energy of the external pump light and changing the conductivity of the semiconductor silicon, the blue shift tuning of the resonance frequency from 0.684THz to 1.414THz is realized. On this basis, the mechanism of two resonant frequencies is studied, and the structure size b, linewidth 蠅, thickness of dielectric layer polyimide (PI) are analyzed emphatically. The influence of Si conductivity 蟽, dielectric constant 蔚 of PI and opening length c on the absorption properties of the tunable metamaterials. Based on cross structure, single band, double band and multi band super material absorbers are constructed in terahertz band. First of all, a perfect supermaterial absorber based on cross structure is designed in terahertz band, which produces strong resonance frequency at 1.74THz, and based on resonant circuit theory. The dependence of resonant frequency of cross-type absorber on its geometric parameters is studied. Secondly, on the basis of cross-type structure, a metal line is added to each side, and a dual-band supermaterial absorber is designed. The resonance frequency points are located at 0.89THz and 2.18 THZ, respectively. Finally, a multi-band supermaterial absorber is designed, the resonance frequency points are 0.996 THZ 1.194 THz1. 870 THz1. 990 THz and 2. 298 THZ, respectively. These metamaterial absorbers have simple structure and excellent properties, which have some reference significance and research value.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O441.4

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