【摘要】：石墨烯等離子體因其相當(dāng)?shù)偷膿p耗、極高的空間局域性、非凡的可調(diào)性以及寬波段激發(fā)等特點受到了廣泛的關(guān)注,在諸多領(lǐng)域顯示出巨大的應(yīng)用潛力。繼石墨烯之后,二硫化鉬(MoS_2)是研究最多的二維層狀材料,其光學(xué)性質(zhì)與層數(shù)密切相關(guān),對于光伏,光電探測器和光發(fā)射器等器件的搭建極具意義。本文采用散射式近場光學(xué)顯微鏡(Scattering-Type Scanning Near-Field Optical Microscope,s-SNOM)研究具有不同納米結(jié)構(gòu)的石墨烯和MoS_2晶體在中紅外光的激發(fā)下所具有的光學(xué)特性。研究內(nèi)容如下:1.利用s-SNOM研究化學(xué)氣相沉積(Chemical Vapor Deposition,CVD)法制備的石墨烯納米結(jié)構(gòu)的表面等離子體特性,發(fā)現(xiàn)納米圖案上的等離子體局域模式與激發(fā)波長和結(jié)構(gòu)的尺寸密切相關(guān),且能夠在寬為25 nm的間隙中發(fā)生共振增強。此外,不同手性石墨烯邊緣的測試結(jié)果表明,之字邊處的等離子體會出現(xiàn)額外的展寬。并且,在近場光學(xué)圖像中,多晶石墨烯薄膜上的晶界清晰可見,該光學(xué)表征結(jié)果是定性分析局部電荷濃度和化學(xué)成分的重要依據(jù)。2.利用s-SNOM對其他方法制備的石墨烯納米結(jié)構(gòu)的表面等離子體特性進行研究,發(fā)現(xiàn)金屬納米粒子裁剪的溝道越淺,寬度越小,產(chǎn)生的近場振幅強度就越強。此外,納米石墨烯的等離子體特性與其尺寸和激發(fā)波長密切相關(guān),隨著尺寸的增大,等離子體共振增強由樣品邊緣向中心位置移動。一定尺寸的納米石墨烯的近場振幅強度隨激發(fā)光波長的增大而增大。3.利用s-SNOM對MoS_2晶體進行近場光學(xué)表征,發(fā)現(xiàn)單層MoS_2晶體的晶界在原子力顯微鏡的相貌圖中可分辨,而在光學(xué)振幅圖圖中不可見。而且,相較于單層MoS_2,多層MoS_2的近場信號出現(xiàn)明顯增強,意味著對光的散射性顯著增強。
[Abstract]:Graphene plasma has attracted wide attention due to its low loss, extremely high spatial localization, special tunability and wide band excitation, and has shown great application potential in many fields. After graphene, molybdenum disulfide (MoS_2) is the most studied two-dimensional layered material, whose optical properties are closely related to the number of layers. In this paper, the optical properties of graphene and MoS_2 crystals with different nanostructures under the excitation of medium infrared light have been studied by means of scattering near-field optical microscope (Scattering-Type Scanning Near-Field Optical Microscope,s-SNOM). The research is as follows: 1. The surface plasma characteristics of graphene nanostructures prepared by chemical vapor deposition (Chemical Vapor Deposition,CVD) method were investigated by s-SNOM. It was found that the local plasma modes on the nanostructures were closely related to the excitation wavelength and the size of the structures. Resonance enhancement can occur in a gap of 25 nm wide. In addition, the results of different chiral graphene edge measurements show that the plasma at the edge of the zigzag will exhibit additional broadening. Moreover, the grain boundaries on polycrystalline graphene thin films are clearly visible in near-field optical images, which is an important basis for qualitative analysis of local charge concentration and chemical composition. The surface plasma characteristics of graphene nanostructures prepared by other methods were studied by s-SNOM. It was found that the shallower the channel and the smaller the width of the metal nanoparticles, the stronger the near field amplitude intensity. In addition, the plasma characteristics of nano-graphene are closely related to its size and excitation wavelength. With the increase of the size, the enhancement of plasmon resonance shifts from the edge of the sample to the center position. The near field amplitude strength of nano-graphene increases with the increase of excitation wavelength. The near field optical characterization of MoS_2 crystals by s-SNOM shows that the grain boundaries of monolayer MoS_2 crystals can be distinguished in the atomic force microscope (AFM) images, but not in the optical amplitude diagrams. In addition, the near field signal of monolayer MoS_2, multilayer MoS_2 is obviously enhanced, which means that the scattering of light is enhanced significantly.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：O613.71;O53

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