本文選題：光子晶體 + 表面等離激元��； 參考：《西南大學(xué)》2015年碩士論文

【摘要】：近年來,微納光子學(xué)引起了人們的廣泛研究,提高光與物質(zhì)作用過程中的光利用效率并實現(xiàn)在微納尺度上對光的操控是研究的重點,其中兩個十分熱門的研究方向是光子晶體和表面等離激元。光子晶體因其特殊的周期性結(jié)構(gòu)而具有光子帶隙特性,從而可以對特定頻率光的傳播進(jìn)行操控。表面等離激元具有表面局域和近場增強的特性,也能夠在納米尺度上調(diào)制附近的電磁信號。光子晶體和表面等離激元的特性使其在表面增強拉曼散射和熒光增強方面有廣泛的應(yīng)用。將光子晶體和表面等離激元相結(jié)合起來的研究具有非常重要的學(xué)術(shù)價值和現(xiàn)實意義,因此本文開展了光子晶體與金屬納米復(fù)合體系的光學(xué)增強效應(yīng)研究。本文的主要研究內(nèi)容和結(jié)論如下：(1)以苯乙烯為單體,甲基苯烯酸為穩(wěn)定劑,過硫酸鉀為引發(fā)劑,采用乳液聚合法合成了聚苯乙烯微球。通過調(diào)節(jié)單體、穩(wěn)定劑和表面活性劑的用量實現(xiàn)’了對聚苯乙烯微球粒徑和單分散性的調(diào)節(jié)。通過膠體自組裝法,制備了具有不同光子帶隙的光子晶體薄膜。(2)通過膠體共組裝、高溫煅燒和離子束濺射制備了光子晶體與銀納米復(fù)合基底,對吸附在該復(fù)合基底表面的R6G分子的拉曼信號進(jìn)行檢測,發(fā)現(xiàn)該基底使R6G分子的拉曼信號顯著增強,銀厚度為20nm的復(fù)合基底檢測限為10-9mol/L,銀厚度為80nm的復(fù)合基底檢測限為10-8mol/L,但復(fù)合基底存在干擾峰。以溶劑腐蝕法代替高溫煅燒法制備的復(fù)合基底除去了自身的干擾峰,該方法制備的復(fù)合基底(銀厚度為20nm和80nm)檢測限均為10-7mol/L。這些復(fù)合基底都具有高密度的“熱點”結(jié)構(gòu),因此相比于空白玻璃基底和銀基底來說,檢測靈敏度均有了明顯的提升。(3)對具有不同光子帶隙的聚苯乙烯光子晶體先進(jìn)行硅烷化或疏水化處理,后經(jīng)離子束濺射制備了光子晶體與銀納米復(fù)合基底。以量子產(chǎn)率高的RhB作為熒光物質(zhì),復(fù)合基底、光子晶體基底均顯著提高了RhB的熒光強度。其中,表面疏水化處理的光子晶體基底熒光增強效果最好,跟石英基底相比最高可以增強熒光強度2486倍。以量子產(chǎn)率較低的MPS-PPV作為熒光物質(zhì),復(fù)合基底、光子晶體基底也都顯著的提高了其熒光強度。其中,未經(jīng)疏水化處理的復(fù)合基底的熒光增強效果最好,跟石英基底相比最高可以增強熒光強度165倍。產(chǎn)生熒光強度大幅度提升的原因是,表面等離激元使激發(fā)效率提高并使輻射衰減速率增加,以及光子晶體能夠抑制自發(fā)輻射。其中,表面等離激元的增強效應(yīng)對量子產(chǎn)率低的熒光物質(zhì)效果更顯著。
[Abstract]:In recent years, micro-nano photonics has been widely studied. The emphasis of the research is to improve the efficiency of light utilization in the process of interaction between light and matter and to realize the manipulation of light at micro-nano scale. Two of the most popular research directions are photonic crystals and surface isopherons. Photonic crystals have photonic band gap because of their special periodic structure, which can control the propagation of light at specific frequencies. The surface isotherms have the characteristics of local and near field enhancement, and can modulate the nearby electromagnetic signals at nanometer scale. Photonic crystals and surface excitators are widely used in surface-enhanced Raman scattering and fluorescence enhancement. It is of great academic value and practical significance to study the combination of photonic crystals and surface isopotons. Therefore, the optical enhancement effect of photonic crystal / metal nanocomposites has been studied in this paper. The main contents and conclusions of this paper are as follows: (1) Polystyrene microspheres were synthesized by emulsion polymerization with styrene as monomer, methyleenoic acid as stabilizer and potassium persulfate as initiator. The particle size and monodispersity of polystyrene microspheres were adjusted by adjusting the amount of monomer, stabilizer and surfactant. Photonic crystal thin films with different photonic band gaps were prepared by colloidal self-assembly method. Photonic crystals and silver nanocomposite substrates were prepared by colloid co-assembly, high temperature calcination and ion beam sputtering. The Raman signal of R6G molecule adsorbed on the surface of the composite substrate was detected. It was found that the Raman signal of R6G molecule was significantly enhanced by the substrate. The detection limit of the composite substrate with silver thickness of 20nm is 10-9 mol / L, and the detection limit of the composite substrate with silver thickness of 80nm is 10-8 mol / L, but the interference peak exists in the composite substrate. The complex substrate prepared by solvent corrosion instead of high temperature calcination method removes its own interference peak. The detection limit of the composite substrate (silver thickness is 20nm and 80 nm) is 10 ~ (-7) mol / L ~ (-1). These composite substrates have high density "hot spot" structures, so compared with blank glass substrates and silver substrates, The sensitivity of polystyrene photonic crystals with different photonic band gaps was firstly silanized or hydrophobically treated, and then the composite substrate of photonic crystals and silver nanocrystals was prepared by ion beam sputtering. Using RhB with high quantum yield as fluorescence material, the fluorescence intensity of RhB was significantly increased by the combination of the substrate and the photonic crystal substrate. The photonic crystal substrate with surface hydrophobic treatment has the best fluorescence enhancement effect, and the highest fluorescence intensity can be enhanced by 2486 times compared with quartz substrate. Using MPS-PPV with low quantum yield as the fluorescent substance, the fluorescence intensity of the composite substrate and the photonic crystal substrate are improved significantly. The fluorescence enhancement of the composite substrate without hydrophobic treatment was the best, and the fluorescence intensity of the composite substrate was 165 times higher than that of the quartz substrate. The reason for the significant increase in fluorescence intensity is that the surface isotherm increases the excitation efficiency and the radiation decay rate, and the photonic crystal can suppress the spontaneous emission. Among them, the enhancement effect of surface isotherm is more significant for the fluorescence with low quantum yield.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O734;TB33

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本文編號：1875006