本文選題：吸波材料 + 金屬-介質(zhì)��； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：電磁吸波材料在各個(gè)領(lǐng)域都有很廣的應(yīng)用，高效寬譜的吸波材料在太陽(yáng)能捕獲、光子探測(cè)等領(lǐng)域有廣泛的應(yīng)用。近些年來(lái)，一維寬譜吸波材料由于其簡(jiǎn)單的結(jié)構(gòu)以及低成本引起了研究者們的關(guān)注。 本論文從理論和實(shí)驗(yàn)兩個(gè)方面研究了一維層狀金屬-介質(zhì)吸波材料。理論計(jì)算方面，根據(jù)轉(zhuǎn)移矩陣?yán)碚摾肕ATLAB軟件編寫(xiě)程序，利用程序?qū)饘俳橘|(zhì)交替的層狀吸波結(jié)構(gòu)進(jìn)行性能的模擬計(jì)算和優(yōu)化；實(shí)驗(yàn)方面，我們利用電子束蒸發(fā)設(shè)備制備了高效寬譜的Ag襯底上Ag納米顆粒與SiO2交替的周期性吸波材料，且其制備方法簡(jiǎn)單，光學(xué)穩(wěn)定性好。具體研究結(jié)論如下： 1.相較于其它模擬軟件，根據(jù)傳輸矩陣?yán)碚摾肕ATLAB編寫(xiě)的計(jì)算層狀吸波材料吸收率的程序計(jì)算速度更快，計(jì)算結(jié)果吻合。通過(guò)對(duì)不同材料、不同厚度、不同配比的周期性金屬介質(zhì)交替結(jié)構(gòu)的優(yōu)化，得出金屬為W，介質(zhì)為MgF2，介質(zhì)在頂層時(shí)的吸收率最優(yōu)，在300nm-2100nm波段范圍內(nèi)，其總吸收率高達(dá)98.1%，且應(yīng)用在熱光伏中時(shí)的品質(zhì)因數(shù)最高。 2.利用電子束蒸發(fā)設(shè)備制備了高效、寬譜Ag襯底上Ag納米顆粒與SiO2交替的吸波材料。實(shí)驗(yàn)結(jié)果表明小周期時(shí)厚Ag納米顆粒層器件的吸收優(yōu)于薄Ag納米顆粒層的器件的吸收，但周期大于3時(shí)，情況則相反。當(dāng)Ag納米顆粒層的名義厚度為5nm時(shí)，所獲得的Ag納米顆粒比較小，所以入射光可以穿透所有的周期層，因此增加周期可以增加吸光單元。理論模擬表明不同層處的Ag納米顆粒雜化激發(fā)出了豐富的局域表面等離子體效應(yīng)，，在可見(jiàn)光波段形成了多個(gè)吸收峰，因此拓寬了吸收波段。具有18個(gè)周期的器件在300-1100nm波段吸收效率高達(dá)96%。因其簡(jiǎn)單的制作工藝及優(yōu)異的光學(xué)性質(zhì)，該器件可用于太陽(yáng)能捕獲及熱輻射調(diào)控等方面。
[Abstract]:Electromagnetic absorbing materials are widely used in various fields, and high efficiency and wide spectrum absorbing materials are widely used in solar energy capture, photon detection and so on. In recent years, one-dimensional wide-spectrum absorbing materials have attracted much attention due to their simple structure and low cost. In this paper, one-dimensional laminated metal-dielectric absorbing materials are studied theoretically and experimentally. In theory, according to the transfer matrix theory, the MATLAB software is used to compile the program, and the simulation and optimization of the performance of the layered absorbing structure with alternating metal medium are carried out by the program. The high efficiency and wide spectrum Ag substrates have been prepared by electron beam evaporation (EBE) equipment. The periodic absorbing materials of Ag nanoparticles and Sio _ 2 on Ag substrates are characterized by simple preparation method and good optical stability. The specific conclusions are as follows: 1. Compared with other simulation software, the program compiled by MATLAB based on the transfer matrix theory to calculate the absorptivity of layered absorbing materials is faster and the calculation results are in agreement with each other. By optimizing the alternate structure of periodic metal medium with different materials, different thickness and different ratio, it is concluded that the metal is W, the medium is MgF2, and the absorptivity of the medium in the top layer is optimal, in the range of 300nm-2100nm band, The total absorptivity is up to 98.1, and the quality factor is the highest when it is used in thermal photovoltaic. High efficient, wide-spectrum Ag substrates with Ag nanoparticles and Sio _ 2 were prepared by electron beam evaporation (EBE) equipment. The experimental results show that the absorption of thick Ag nanocrystalline layer in small period is better than that of thin Ag nanocrystalline layer, but when the period is greater than 3, the situation is opposite. When the nominal thickness of Ag nanoparticles is 5nm, the Ag nanoparticles obtained are relatively small, so the incident light can penetrate all periodic layers, so increasing the period can increase the absorption units. The theoretical simulation shows that the hybrid of Ag nanoparticles at different layers excites abundant local surface plasma effects and forms multiple absorption peaks in the visible light band, thus widening the absorption band. The absorption efficiency of the device with 18 cycles in the 300-1100nm band is as high as 96. Because of its simple fabrication process and excellent optical properties, the device can be used in solar energy capture and thermal radiation control.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB34

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