【摘要】：高溫物質(zhì)光譜吸收特性的調(diào)控在雷達(dá)探測、航空航天、生物醫(yī)學(xué)、太陽能電池等方面都具有潛在的應(yīng)用價(jià)值,利用表面等離子體效應(yīng)調(diào)控金屬材料光譜吸收特性越來越受到人們關(guān)注。目前對吸收特性調(diào)控技術(shù)的研究還局限在銀、金等熔點(diǎn)相對較低的貴金屬,在地殼中含量少,開采困難,應(yīng)用范圍具有一定的局限性。本論文為了滿足高溫環(huán)境的使用需求,提出了高溫物質(zhì)吸收特性調(diào)控技術(shù)的研究。表面等離子體是光照射在金屬表面時(shí),金屬表面自由振蕩的電子與光子相互作用而產(chǎn)生的一種電子倏逝波。本論文以表面等離子體效應(yīng)為基礎(chǔ),運(yùn)用時(shí)域有限差分法(FDTD),結(jié)合電磁場的相關(guān)理論,研究了兩種基于超高溫金屬材料的周期納米結(jié)構(gòu),通過改變不同的結(jié)構(gòu)參數(shù),對各種物理現(xiàn)象進(jìn)行對比,發(fā)現(xiàn)吸收特性調(diào)控因子,并通過電磁場分布研究吸收機(jī)理。本論文的主要研究工作如下:構(gòu)建基于金屬鎢的光柵型周期納米結(jié)構(gòu),仿真分析其在波長200-4000nm范圍內(nèi),結(jié)構(gòu)周期、寬度、深度、抗氧化膜層厚度等不同參數(shù)對光譜吸收特性的影響。仿真分析表明,不同參數(shù)的吸收曲線光學(xué)特性存在異同,均會(huì)出現(xiàn)吸收峰,且吸收峰值達(dá)到93%以上;介電材料、周期、寬度、深度是影響吸收特性的主要因素,介電材料和周期對吸收峰的位置產(chǎn)生影響,隨著參數(shù)的變化發(fā)生紅移或藍(lán)移。該研究結(jié)果為高溫物質(zhì)吸收特性的調(diào)控提供了新的方法。構(gòu)建基于金屬鉭和介電材料Al2O3的圓柱型周期納米陣列。保持其他結(jié)構(gòu)參數(shù)不變,分別改變周期、圓柱半徑、介電層材料,計(jì)算光譜吸收曲線,比較不同參數(shù)下吸收特性的異同,隨著參數(shù)的改變,出現(xiàn)不同的物理現(xiàn)象,共振峰紅移、藍(lán)移、衰減、增強(qiáng)、帶寬增大、減小等,變化規(guī)律不同。通過共振峰的電場分布圖,分析兩種不同的吸收機(jī)理,即金屬表面等離子體激元共振和局域波導(dǎo)共振。該研究結(jié)果對于超高溫金屬納米結(jié)構(gòu)光譜吸收特性調(diào)控技術(shù)的研究具有指導(dǎo)作用。本論文的研究內(nèi)容為亞波長金屬周期陣列吸收特性的調(diào)控提供了新的調(diào)控因子,豐富了該類納米結(jié)構(gòu)的調(diào)控方法,便于人們根據(jù)實(shí)際應(yīng)用中的需要對電磁波進(jìn)行合適的操縱。
[Abstract]:The regulation of spectral absorption characteristics of high temperature substances has potential application value in radar detection, aerospace, biomedicine, solar cells and so on. More and more attention has been paid to the use of surface plasma effect to regulate the spectral absorption characteristics of metallic materials. At present, the study of absorption characteristics control technology is still limited in the relatively low melting point of silver, gold and other precious metals, the content in the earth's crust is less, mining is difficult, and the application scope has some limitations. In order to meet the demand of high temperature environment, the research of high temperature material absorption characteristics control technology was put forward in this paper. Surface plasma is an electron evanescent wave produced by the interaction of electrons and photons in the free oscillation of the metal surface when the light is emitted on the metal surface. In this paper, based on the surface plasma effect, two kinds of periodic nanostructures based on ultra-high temperature metal materials are studied by using the finite-difference time-domain (FDTD) (FDTD), combined with the theory of electromagnetic fields. Through the comparison of various physical phenomena, the regulatory factors of absorption characteristics were found, and the absorption mechanism was studied by the distribution of electromagnetic fields. The main work of this thesis is as follows: to construct the grating periodic nanostructure based on metal tungsten, and to simulate and analyze the structure period, width and depth in the wavelength range of 200-4000nm. The effect of different parameters such as the thickness of the antioxidation film on the spectral absorption characteristics. The simulation analysis shows that the optical properties of the absorption curves of different parameters are different, and the absorption peaks will appear, and the absorption peaks are over 93%. The dielectric material, period, width and depth are the main factors that affect the absorption characteristics. The dielectric material and the period affect the position of the absorption peak, and the red-shift or blue-shift occurs with the change of the parameters. The results of this study provide a new method for the regulation of absorption characteristics of high temperature substances. A cylindrical periodic nanoarray based on tantalum and dielectric material Al2O3 was constructed. Keep the other structural parameters unchanged, change the period, cylindrical radius, dielectric layer material, calculate the spectral absorption curve, compare the differences of absorption characteristics under different parameters, with the change of parameters, there are different physical phenomena, resonance peak red shift, Blue shift, attenuation, enhancement, bandwidth increase, decrease, and so on, the law of change is different. Two different absorption mechanisms, the plasmon resonance on the metal surface and the local waveguide resonance, are analyzed by means of the electric field distribution of the resonance peak. The results can be used to study the spectral absorption characteristics of ultra-high temperature metal nanostructures. The research contents of this paper provide a new regulation factor for the absorption characteristics of subwavelength metal periodic arrays, and enrich the regulation methods of this kind of nanostructures. It is convenient for people to properly manipulate electromagnetic waves according to the needs of practical applications.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG111;TB383.1

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