【摘要】：太赫茲因其獨(dú)特的性質(zhì)被廣泛地應(yīng)用于安全檢查、物質(zhì)檢測(cè)、保密通信等領(lǐng)域。但是,由于相關(guān)發(fā)射和探測(cè)技術(shù)的落后,太赫茲波成為為電磁波譜中最后一個(gè)研究空白。超材料因其優(yōu)異的電磁性質(zhì)成為電磁學(xué)的一個(gè)重要分支,通過合理設(shè)計(jì)超材料的結(jié)構(gòu)和材料參數(shù),可以對(duì)電磁波進(jìn)行任意的剪裁,因此太赫茲超材料的出現(xiàn)為太赫茲技術(shù)的發(fā)展和應(yīng)用帶來(lái)了新的機(jī)遇。本文主要開展太赫茲超材料吸波器的設(shè)計(jì)、制備及性能調(diào)控等研究,主要研究?jī)?nèi)容及結(jié)論概括如下:(1)設(shè)計(jì)了一種具有螺旋環(huán)結(jié)構(gòu)的新型超材料。系統(tǒng)的仿真結(jié)果顯示,與常規(guī)超材料吸波器的調(diào)節(jié)方式不同,在材料的種類及厚度都不變的情況下,僅通過改變表面螺旋環(huán)的環(huán)數(shù)或環(huán)的起始和終止位置,就能高效地調(diào)節(jié)螺旋環(huán)超材料的太赫茲響應(yīng)性能。這是因?yàn)槁菪h(huán)能夠產(chǎn)生較強(qiáng)的耦合作用,同時(shí)由于其諧振的不完全對(duì)稱性,使螺旋環(huán)超材料的響應(yīng)頻率更加依賴結(jié)構(gòu)參數(shù)。而且,這種超材料的吸收響應(yīng)頻率可以通過駐波公式計(jì)算得到、具有可預(yù)見性。(2)利用微細(xì)加工中的掩膜和光刻兩種技術(shù)分別成功地制備出柔性超材料吸波器。形貌表征結(jié)果顯示,采用掩膜技術(shù)所制備的柔性太赫茲超材料吸波器的表面方形諧振器更規(guī)則、邊緣更整齊。重要的是,SiNx掩膜可以反復(fù)利用,使超材料的制備更加容易。(3)通過外力使柔性太赫茲超材料吸波器發(fā)生彎曲的方式,對(duì)超材料的太赫茲響應(yīng)特性進(jìn)行調(diào)節(jié),由此使其響應(yīng)頻率從4.45 THz調(diào)節(jié)到5.26 THz,調(diào)節(jié)范圍可達(dá)0.81THz,并通過等效電路法進(jìn)行了分析論證。(4)在已經(jīng)制備出柔性超材料吸波器的基礎(chǔ)上,通過自組裝的方式覆蓋一層(3-巰基丙基)三甲氧基硅烷單分子膜。通過傅里葉中紅外變換測(cè)試系統(tǒng)證實(shí)(3-巰基丙基)三甲氧基硅烷單分子膜的確生長(zhǎng)在超材料的表層金屬諧振器的表面。據(jù)此,使超材料的響應(yīng)頻率從原來(lái)的4.80 THz被調(diào)節(jié)到4.74 THz,而且吸收率整體上移。
[Abstract]:Terahertz is widely used in the fields of safety inspection, material detection, secure communication and other fields. However, due to the backwardness of related emission and detection technology, terahertz wave has become the last research blank in the electromagnetic spectrum. Supermaterials have become an important branch of electromagnetics because of their excellent electromagnetic properties. According to the structure and material parameters of supermaterial, the electromagnetic wave can be arbitrarily cut, so the emergence of terahertz supermaterials has brought new opportunities for the development and application of terahertz technology. This paper mainly studies the design, preparation and performance control of the terahertz supermaterial absorbers. The main contents and conclusions are as follows: (1) A new type of supermaterial with a spiral ring structure is designed. The simulation results show that it is different from the conventional supermaterial absorbers, that the number of materials and the thickness of the material are not constant, but only by changing the ring number of the spiral ring or the starting and termination of the ring, the hyper material can be effectively adjusted. This is because the spiral ring can produce strong coupling, and the response frequency of the spiral ring supermaterial is more dependent on the structural parameters due to the incomplete symmetry of its resonance. Moreover, the absorption response frequency of the supermaterial can be calculated by the standing wave formula. (2) the use of micro processing is used. The two techniques of mask and photolithography have successfully prepared the flexible supermaterial absorbers. The morphology results show that the square resonator of the flexible terahertz supermaterial absorber made by the mask technology is more regular and the edge is more neat. It is important that the SiNx mask can be reused and the preparation of the supermaterial is easier. (3) Excessive force makes the flexible terahertz supermaterial absorber bend and regulates the response characteristic of the terahertz response to the supermaterial, thus the response frequency is adjusted from 4.45 THz to 5.26 THz, the adjustment range is up to 0.81THz, and the analysis is carried out by the equivalent circuit method. (4) based on the preparation of the flexible supermaterial absorber, A layer of (3- mercapto propyl) trimethoxy silane monolayer was covered by self assembly. It was confirmed by Fourier mid infrared transform test system that the (3- mercapto propyl) trimethoxy silane monolayer did grow on the surface of the surface metal resonator of supermaterial. Accordingly, the response frequency of the supermaterial was adjusted from the original 4.80 THz. To 4.74 THz, and the absorption rate is moved up as a whole.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB34;O441

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