柔性太赫茲波超材料吸收器的研究
發(fā)布時(shí)間：2018-08-24 08:37
【摘要】：隨著太赫茲(Terahertz,THz)科學(xué)的發(fā)展,太赫茲吸收器、濾波器等能改善傳輸過(guò)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(duì)太赫茲波響應(yīng)和探測(cè)的材料,嚴(yán)重制約了其發(fā)展,超材料(Metamaterials,MMs)的出現(xiàn)為研究和設(shè)計(jì)太赫茲器件提供了極大的便利。超材料可以通過(guò)改變單元周期結(jié)構(gòu)的幾何參數(shù),使它的介電常數(shù)和磁導(dǎo)率在特定頻率范圍內(nèi)一個(gè)或者兩個(gè)同時(shí)為負(fù)值,從而改變它的電磁共振響應(yīng),因此它在電磁隱身、光電探測(cè)等方面都有極大的應(yīng)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(qiáng)、頻率可控性和設(shè)計(jì)靈活性等諸多優(yōu)點(diǎn),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(shè)計(jì)了不同類型的超材料吸收器并對(duì)其吸收特性進(jìn)行研究,主要工作和創(chuàng)新點(diǎn)如下:1.在太赫茲波段設(shè)計(jì)一種光激勵(lì)可調(diào)諧超材料吸收器。在開(kāi)口諧振環(huán)(split-ring resonators,SRRs)的關(guān)鍵區(qū)域開(kāi)口處植入光敏半導(dǎo)體硅,通過(guò)改變外部泵浦光的光照能量,改變半導(dǎo)體硅的電導(dǎo)率,實(shí)現(xiàn)共振頻率由0.684THz到1.414THz的藍(lán)移調(diào)諧。在此基礎(chǔ)上研究了兩個(gè)共振頻率產(chǎn)生的機(jī)理,并著重分析了單元結(jié)構(gòu)尺寸b、線寬ω、電介質(zhì)層聚酰亞胺(PI)的厚度、硅的電導(dǎo)率σ、材料PI的介電常數(shù)ε以及開(kāi)口長(zhǎng)度c等參數(shù)對(duì)此可調(diào)諧超材料吸收性能的影響。2.基于十字型結(jié)構(gòu),在太赫茲波段構(gòu)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(shè)計(jì)出基于十字型結(jié)構(gòu)的完美超材料吸收器,在1.74THz處產(chǎn)生了強(qiáng)的共振頻點(diǎn),同時(shí)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(guān)系。其次,在十字型結(jié)構(gòu)的基礎(chǔ)上,上下左右各加一條金屬線條,設(shè)計(jì)出雙頻帶超材料吸收器,共振頻點(diǎn)分別位于0.89THz和2.18THz;最后,設(shè)計(jì)出多頻帶超材料吸收器,共振頻點(diǎn)分別為0.996THz、1.194THz、1.870THz、1.990THz和2.298THz。這些超材料吸收器結(jié)構(gòu)簡(jiǎn)單性能優(yōu)良,具有一定的借鑒意義和研究?jī)r(jià)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(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O441.4
[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(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O441.4
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