本文關鍵詞：表面等離子體多光束干涉及近場衍射的研究　出處：《中國科學院大學(中國科學院長春光學精密機械與物理研究所)》2017年碩士論文　論文類型：學位論文

  更多相關文章： 表面等離子體 FDTD Solutions軟件 表面等離子體多光束干涉 表面等離子體近場衍射

【摘要】：表面等離子體是入射光與金屬表面的自由電子相互耦合而形成的一種表面電磁模.雖然對表面等離子體波的研究已有一百多年的歷史,但初期由于受工藝水平限制,難以制備微納尺度的電子元件,因而表面等離子體波體現(xiàn)不出它的獨特性質,不被人們所重視.隨著科技的飛速發(fā)展,特別是微納尺寸的電子元件及回路的制作技術日漸成熟,表面等離子體又重新回到了人們的視野.表面等離子體具有短波長,近場增強和表面局域的特性.本論文基于FDTD Solutions軟件,對SPP多光束干涉產生的干涉條紋及點陣圖樣及表面等離子體波在金屬表面上的衍射現(xiàn)象做了進一步的研究.在研究SPP波多光束干涉時主要研究的是用金屬光柵耦合的方式激發(fā)SPP波,在多束SPP波相遇的中央?yún)^(qū)域內,會產生干涉條紋或干涉點陣圖案,其干涉所形成的干涉條紋或點陣圖樣中攜帶有超衍射極限的空間頻率部分,將其作為顯微鏡的結構光照明,可突破衍射極限,實現(xiàn)超分辨率成像.本章從產生SPP波的金屬光柵材料,結構參數(shù),入射光波長,光源類型等方面出發(fā),研究其對產生的多光束干涉條紋或點陣圖樣的影響,找出產生最佳SP干涉駐波的光柵結構,作為顯微鏡的結構照明光源.在研究在金屬表面上的衍射現(xiàn)象時主要研究的是SPP波在金屬銀膜表面近場衍射的現(xiàn)象.由于其隱失場的特性,SPs具有短波長、表面局域及近場增強的特性,這些都與空間光有著很大的區(qū)別。但是在近場區(qū)域,SPs具有與空間光類似的性質,它們在近場衍射方面有著類似的性質。本章對400-700nm波段的可見光,利用金屬光柵耦合方式產生表面等離子體波,然后對其進行多縫的近場衍射模擬,改變衍射光柵的周期及占空比,近場衍射現(xiàn)象會發(fā)生變化,當衍射光柵周期約為激發(fā)的SPP波的3/2倍時,近場衍射效果最明顯,這時衍射光柵可充當分離光譜的作用.
[Abstract]:Surface plasma is a surface electromagnetic mode formed by coupling of incident light and free electron on metal surface. Although the study of surface plasma wave has been more than 100 years. However, due to the limitation of the process level, it is difficult to prepare micro and nano scale electronic components at the initial stage, so the surface plasma wave can not reflect its unique properties and is not paid attention to. With the rapid development of science and technology. Especially, the fabrication technology of micro- and nanoscale electronic components and circuits is maturing day by day, and the surface plasma comes back to the field of vision again. The surface plasma has short wavelength. Near field enhancement and surface localization. This paper is based on FDTD Solutions software. The interference fringes, lattice patterns and diffraction phenomena of surface plasma waves on metal surface produced by SPP multi-beam interference are further studied. In the study of SPP multi-beam interference, gold is mainly used to study. The SPP wave is excited by grating coupling. In the central region where multiple SPP waves meet, interference fringes or interference lattice patterns will be produced, and the interference fringes or lattice patterns will carry the spatial frequency part of the superdiffraction limit in the interference patterns. It can break through the diffraction limit and realize super-resolution imaging. This chapter starts from the aspects of metal grating materials, structure parameters, incident wavelength, light source type and so on. The influence on the multi-beam interference fringes or lattice patterns is studied, and the structure of the gratings producing the best SP interference standing wave is found out. As a structural illumination source of microscope, the diffraction phenomenon of SPP wave on the surface of metal silver film is mainly studied in the study of diffraction phenomenon on the surface of metal, because of its hidden field characteristics. SPs have the characteristics of short wavelength, surface localization and near field enhancement, which are very different from spatial light, but they have similar properties to spatial light in near field. They have similar properties in near-field diffraction. In this chapter, surface plasma waves are generated by metal grating coupling for the visible light at 400-700nm. The near field diffraction phenomenon will change by changing the period and duty cycle of the diffraction grating, when the diffraction grating period is about 3/2 times of the excited SPP wave. The near field diffraction effect is the most obvious, and the diffraction grating can act as the separation spectrum.
【學位授予單位】：中國科學院大學(中國科學院長春光學精密機械與物理研究所)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O436.1

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