多壁碳纳米管薄膜在太赫兹波段透射增强特性研究

发布时间：2018-04-19 22:34

  本文选题：太赫兹波 + 表面等离子体激元　； 参考：《哈尔滨理工大学》2017年硕士论文

【摘要】：通过对亚波长金属薄膜孔阵结构的透射光研究,发现这种结构的光透射率远远超过了以往小孔散射经典理论预测值。这种反常的光透射现象通常认为是由界面处表面等离子体激元的激发共振所引起的,在近场显微镜和生物传感器等方面的研究受到广泛关注。本文首先对亚波长孔阵结构透射增强特性的研究背景和发展状况进行了概述,简要地介绍了太赫兹波的特性,并且对表面等离子体激元的概念和激发作了详细的说明。本文主要研究一维亚波长周期光栅结构和二维周期性矩形孔阵结构的超顺排多壁碳纳米管薄膜在太赫兹波段的透射增强特性。实验所用多壁碳纳米管薄膜是由高度超顺排多壁碳纳米管阵列直接拉制而成,而这种高度超顺排多壁碳纳米管阵列则是通过低压化学气相沉积法制备得到的。利用太赫兹时域光谱仪对超顺排多壁碳纳米管薄膜进行测试,获得薄膜在0.2-2.5THz频率范围内的介电性质和各向异性。超顺排多壁碳纳米管薄膜介电参数的实验结果能够与理论模型拟合很好,而且薄膜在THz频段介电常数的实部为负值,证明了本文制备得到的超顺排多壁碳纳米管薄膜具有很好的金属性并且适用于本文的研究。此外,超顺排多壁碳纳米管薄膜具有很强的各向异性,单独的多壁碳纳米管薄膜可以作为THz偏振器来应用。最后利用激光加工技术在多壁碳纳米管薄膜上加工周期不同的光栅结构和矩形孔阵结构。通过实验和数值仿真对周期光栅和矩形孔阵多壁碳纳米管薄膜在THz频率范围内的透射增强特性进行研究。
[Abstract]:By studying the transmission light of subwavelength metal thin film porous array, it is found that the optical transmittance of this structure is much higher than that of the classical theory of small hole scattering. This anomalous light transmission phenomenon is generally considered to be caused by the excitation resonance of surface plasmon at the interface, and the research on near-field microscope and biosensor has been paid more and more attention. In this paper, the background and development of transmission enhancement characteristics of subwavelength aperture arrays are summarized, the characteristics of terahertz waves are briefly introduced, and the concept and excitation of surface plasmon excitations are described in detail. In this paper, the transmission-enhancement characteristics of ultra-cis-row multiwalled carbon nanotubes (MWNTs) in terahertz (THz) band with the structure of a 2-D periodic grating and a two-dimensional periodic rectangular array are studied. The multiwalled carbon nanotubes (MWNTs) thin films used in the experiment were directly pulled by the high supercis row multiwalled carbon nanotube arrays, which were prepared by low pressure chemical vapor deposition (LCVD). Terahertz time-domain spectroscopy (THz) was used to measure the supercis multiwalled carbon nanotube films. The dielectric properties and anisotropy of the films in the 0.2-2.5THz frequency range were obtained. The experimental results of permittivity of supercis multiwalled carbon nanotubes film can be fitted well with the theoretical model, and the dielectric constant of the film is negative in the THz band. It is proved that the supercis multiwalled carbon nanotube films prepared in this paper have good gold properties and are suitable for the study in this paper. In addition, the multiwalled carbon nanotube films have strong anisotropy, and individual multi-walled carbon nanotubes films can be used as THz polarizers. Finally, the grating structure and rectangular aperture structure with different cycles were fabricated on multiwalled carbon nanotubes (MCNTs) films by laser processing. The transmission enhancement characteristics of periodic grating and rectangular array multiwalled carbon nanotube films in THz frequency range were studied by experiment and numerical simulation.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O484;TB383.1

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