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Surface Plasmons Coupling for Dual-band Resonance SERs Substrates

Author: HeJinNa
Tutor: LiangErJun
School: Zhengzhou University
Course: Optics
Keywords: Localized surface plasmon resonance Surface plasmon Plasma coupling Surface Enhanced Raman Spectroscopy
CLC: O433.4
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Electromagnetic wave interaction with the metal nano-materials exhibit bulk metal materials (bulk metal) do not have optical properties, triggering a series of new effects and new phenomena, such as surface plasmon (Surface Plasmons) and to be able to achieve a natural media do not have a new type of electromagnetic characteristics of electromagnetic super media (Meta-materials). With nanometer manufacturing technology development, it has been able to achieve any shape or structure of metal nanomaterials preparation and also accelerate the development of these emerging disciplines or fields. Traditional surface-enhanced Raman spectroscopy (Surface Enhanced the Raman spectroscopy, SERS) poor reproducibility and stability of the substrate Raman signal, severely restricted the extensive application of surface spectroscopy. Therefore, based on the the surface plasmon performance of metal nanomaterials, artificially designed structure unit high electromagnetic field enhancement, high stability and reproducibility of the SERS substrate has been studied extensively. This article is mainly the design of a gold ring-SiO2-gold film periodic array structure, and studied in the mode coupling of the surface plasmon resonance properties of the double belt and the corresponding electric field distribution. The structure of dual band high SERS enhancement factor in surface spectroscopy has potential applications. This article is divided into a total of five parts. Introduction section introduces the history of development and research status of SERS, and based on the working assumption of this paper and the main content. The second part introduces the metal nanomaterials the surface plasmon performance and local field enhancement effect. The third part introduces the discrete dipole approximation (Discrete dipole approximation, DDA) theoretical basis, and analysis of the effectiveness of its simulation of the electromagnetic properties of metal nanomaterials. Part IV With DDSCAT7.0 simulation tools, specific discussion of the optical properties of gold ring-SiO2-gold film structure. First, compared with no gold film, due to the interaction between the gold ring and its mirror-image charges induced in the gold film, this structure has a higher localized field enhancement factor, and a near perfect absorption. Secondly, the periodic array of gold rings as grating coupled vertically incident light excited surface plasmon polaritons (Surface Plasmon Polaritons SPP). Adjusted by changing the cycle SPP with LSPR strong coupling occurs in the strong coupling condition, the structure shows a dual band resonance, and further the local electric field enhancement, SERS enhancement factor can reach 1.5 × 10 1.4 × 106. Chapter Summary and Outlook for full-text. Innovation and the main results of the work of this thesis has the following three aspects: 1. Previous the SERs base often limited to a single metal nanoparticles and single-band local electric field enhancement. This paper presents the cyclical nature of the gold ring-SiO2-gold film array structure to achieve a double with the local electric field enhancement. In addition, 98% of the absorption coefficient to provide a reference value to the the perfect absorbent body, and the thin film solar cell research. Currently, discrete dipole approximation method used to study the optical properties of the individual metal nanoparticles, metallic nanostructures periodic study also relatively small. This thesis is compared with some of the results of the experimental data in the literature has been published, the validity of the discrete dipole approximation method of the electromagnetic properties of periodic metallic nanostructures. Theory systematic analysis of the the metal nanomaterials surface plasmon mode as well as the corresponding local field enhancement effect, and pointed out that the coupling effect between the plasma mode is to improve the key factors of the SERS enhancement factor.

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