本文選題：表面等離子體耦合 + 近場增強��； 參考：《清華大學(xué)》2016年博士論文

【摘要】：金屬納米結(jié)構(gòu)的表面等離子體的耦合可以產(chǎn)生巨大的局域電場增強。作為表面等離子體光子學(xué)領(lǐng)域最引人注目的現(xiàn)象之一,近場增強是許多應(yīng)用的基礎(chǔ),從表面增強光譜、生物化學(xué)傳感器,到單分子檢測、非線性光學(xué)等等。本文以表面增強拉曼散射的電磁增強機理為切入點,在電磁學(xué)有限元法的基礎(chǔ)上,應(yīng)用高斯定律,發(fā)展了一種直觀的表面等離子體近場成像方法,可以直接確定復(fù)雜的表面等離子體共振模式。隨后,從實際應(yīng)用中提取出了一系列典型的表面等離子體共振體系,圍繞表面等離子體共振模式的耦合、近場增強的特性以及近場和遠(yuǎn)場共振的光譜偏移等基本理論問題,進(jìn)行系統(tǒng)而深入的有限元法模擬計算研究,旨在提供清晰的表面等離子體物理圖像,促進(jìn)表面等離子體器件的優(yōu)化設(shè)計和光譜學(xué)應(yīng)用。對于最重要的電磁熱點結(jié)構(gòu):納米顆粒二聚體,本文定量地分析了其納米狹縫效應(yīng),發(fā)現(xiàn)近場增強幾乎按納米狹縫尺寸的冪律形式衰減,同時近場和遠(yuǎn)場共振位移都遵循狹縫尺寸的單指數(shù)衰減方程。當(dāng)狹縫區(qū)域被金屬橋連接導(dǎo)通以后,可見光區(qū)域的成鍵偶極子模式迅速衰退,但卻能激發(fā)電荷轉(zhuǎn)移模式,產(chǎn)生巨大的可調(diào)制的紅外近場增強,為紅外波段潛在的器件提供了一個新的結(jié)構(gòu)設(shè)計思路。對于納米顆粒二聚體的替代結(jié)構(gòu):金屬鏡膜耦合的納米顆粒體系,本文考慮了納米顆粒-納米顆粒和納米顆粒-鏡膜兩種耦合作用同時存在時系統(tǒng)共振模式和近場增強的變化,證明金屬鏡膜會誘導(dǎo)出兩種不同的成鍵偶極子模式,能提供比孤立的成鍵偶極子模式更強的局域電場增強。對于備受關(guān)注的金屬納米陣列結(jié)構(gòu),本文預(yù)測了二維表面等離子體晶體的具有普遍性的法諾共振近場相長和相消的干涉花樣,以最直觀的方式證明了其物理本質(zhì)是一種波的干涉現(xiàn)象。最后,基于以上研究結(jié)果和理論認(rèn)識,本文研究了亞波長密排金納米棒陣列。通過遠(yuǎn)場和近場光學(xué)性質(zhì)的理論計算,并結(jié)合實驗驗證,證明了陣列多極子耦合模式的存在及其可調(diào)制性。
[Abstract]:The coupling of surface plasmas in metal nanostructures can result in a large local electric field enhancement. As one of the most attractive phenomena in the field of surface plasmon photonics, near field enhancement is the basis of many applications, from surface enhanced spectroscopy, biochemical sensors, single molecule detection, nonlinear optics and so on. Based on the electromagnetic enhancement mechanism of surface-enhanced Raman scattering and on the basis of electromagnetic finite element method and Gao Si's law, an intuitionistic near-field imaging method for surface plasmas is developed in this paper. Complex surface plasmon resonance modes can be determined directly. Then, a series of typical surface plasmon resonance systems are extracted from practical applications, which revolve around the coupling of surface plasmon resonance modes, the characteristics of near-field enhancement and the spectral offset of near-field and far-field resonance. The purpose of this paper is to provide clear physical images of surface plasmas and to promote the optimal design and spectroscopic applications of surface plasma devices. For the most important hot electromagnetic structure: nanocrystalline dimer, the effect of nanometer slit is quantitatively analyzed. It is found that the near field enhancement attenuates almost according to the power law of nanometer slit size. At the same time, both near-field and far-field resonance displacements follow the single exponential attenuation equation of slit size. When the slit region is connected by a metal bridge, the bonding dipole mode in the visible region decays rapidly, but it can excite the charge transfer mode, resulting in a huge modulated near infrared enhancement. It provides a new structure design idea for infrared band potential devices. For the alternative structure of nanocrystalline dimer: metal mirror membrane coupled nanocrystalline system, the system resonance mode and near-field enhancement changes are considered when both nanocrystalline and nanocrystalline nanomicroscopic coupling exist at the same time. It is shown that the metal mirror film can induce two different bonding dipole modes, which can provide a stronger local electric field enhancement than the isolated bonding dipole mode. For the metal nanoarrays which have attracted much attention, the interference patterns of the universal near field Farno resonance phase and elimination of two-dimensional surface plasma crystals are predicted in this paper. It is proved in the most intuitionistic way that its physical essence is a wave interference phenomenon. Finally, based on the above research results and theoretical understanding, we studied the subwavelength dense gold nanorods array. Through the theoretical calculation of the optical properties of the far and near fields and the experimental verification, the existence and modulability of the array multipole coupling mode are proved.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TG111

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