發(fā)布時(shí)間：2018-04-19 22:34

  本文選題：太赫茲波 + 表面等離子體激元��； 參考：《哈爾濱理工大學(xué)》2017年碩士論文

【摘要】：通過(guò)對(duì)亞波長(zhǎng)金屬薄膜孔陣結(jié)構(gòu)的透射光研究,發(fā)現(xiàn)這種結(jié)構(gòu)的光透射率遠(yuǎn)遠(yuǎn)超過(guò)了以往小孔散射經(jīng)典理論預(yù)測(cè)值。這種反常的光透射現(xiàn)象通常認(rèn)為是由界面處表面等離子體激元的激發(fā)共振所引起的,在近場(chǎng)顯微鏡和生物傳感器等方面的研究受到廣泛關(guān)注。本文首先對(duì)亞波長(zhǎng)孔陣結(jié)構(gòu)透射增強(qiáng)特性的研究背景和發(fā)展?fàn)顩r進(jìn)行了概述,簡(jiǎn)要地介紹了太赫茲波的特性,并且對(duì)表面等離子體激元的概念和激發(fā)作了詳細(xì)的說(shuō)明。本文主要研究一維亞波長(zhǎng)周期光柵結(jié)構(gòu)和二維周期性矩形孔陣結(jié)構(gòu)的超順排多壁碳納米管薄膜在太赫茲波段的透射增強(qiáng)特性。實(shí)驗(yàn)所用多壁碳納米管薄膜是由高度超順排多壁碳納米管陣列直接拉制而成,而這種高度超順排多壁碳納米管陣列則是通過(guò)低壓化學(xué)氣相沉積法制備得到的。利用太赫茲時(shí)域光譜儀對(duì)超順排多壁碳納米管薄膜進(jìn)行測(cè)試,獲得薄膜在0.2-2.5THz頻率范圍內(nèi)的介電性質(zhì)和各向異性。超順排多壁碳納米管薄膜介電參數(shù)的實(shí)驗(yàn)結(jié)果能夠與理論模型擬合很好,而且薄膜在THz頻段介電常數(shù)的實(shí)部為負(fù)值,證明了本文制備得到的超順排多壁碳納米管薄膜具有很好的金屬性并且適用于本文的研究。此外,超順排多壁碳納米管薄膜具有很強(qiáng)的各向異性,單獨(dú)的多壁碳納米管薄膜可以作為T(mén)Hz偏振器來(lái)應(yīng)用。最后利用激光加工技術(shù)在多壁碳納米管薄膜上加工周期不同的光柵結(jié)構(gòu)和矩形孔陣結(jié)構(gòu)。通過(guò)實(shí)驗(yàn)和數(shù)值仿真對(duì)周期光柵和矩形孔陣多壁碳納米管薄膜在THz頻率范圍內(nèi)的透射增強(qiáng)特性進(jìn)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.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O484;TB383.1

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本文編號(hào)：1775063