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Planar resonant structures for biosensing applications.

机译：用于生物传感应用的平面谐振结构。

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摘要

This thesis presents theoretical studies of spontaneous Raman scattering and coherent anti-Stokes Raman scattering (CARS) from molecules on resonant multilayer structures. A simple isotropic model is exploited to describe the Raman polarizability of molecules, and a Green function method is used to calculate the scattering fields from molecules. The response of the multilayer structures to incident fields is characterized through a transfer matrix method that allows derivation of semi-analytic expressions for Raman cross sections and CARS powers in terms of Fresnel coefficients of the structures.;The main focus in this thesis is on purely dielectric structures, especially truncated periodic multilayers that support Bloch surface waves (BSW). The dispersion relation of these resonances can be engineered to allow resonant coupling of all incoming and outgoing fields in spontaneous Raman scattering and CARS. As a result, the spontaneous Raman cross section is enhanced up to 106 in particular directions and the CARS power from monolayers is significant for millimeter wide incident beams. I compare the spontaneous Raman and CARS powers from thin layers of molecules on multilayer structures supporting BSWs and show how these ratios scale when the molecules form lipid bilayers. I present experimental realizations of surface enhanced Raman scattering from acetone and sulphur molecules on BSW structures and show that the excitation of BSWs results in observation of Raman lines that are not observable on a bare prism.;I use a Fresnel coefficient pole analysis to develop a systematic strategy for designing multilayer structures that support long range surface plasmons (LRSPs) and design a periodic multilayer structure that supports a LRSP with propagation length about 2 mm. With a view toward biosensing applications, I derive semi-analytic expressions for a standard surface sensing parameter in arbitrary planar resonant structures and compare the exact and approximate calculations for the designed LRSP structure.
机译：本文提出了共振多层结构分子自发拉曼散射和相干反斯托克斯拉曼散射（CARS）的理论研究。利用简单的各向同性模型描述分子的拉曼极化率，并使用格林函数方法计算分子的散射场。多层结构对入射场的响应通过传递矩阵法进行表征，该方法允许根据结构的菲涅耳系数推导拉曼横截面和CARS幂的半解析表达式。介电结构，尤其是支持Bloch表面波（BSW）的截短的周期性多层。可以设计这些共振的色散关系，以允许自发拉曼散射和CARS中所有传入和传出场的共振耦合。结果，自发拉曼截面在特定方向上增强到106，并且对于毫米宽的入射光束，来自单层的CARS功率非常重要。我比较了支持BSW的多层结构上分子薄层的自发拉曼能量和CARS能量，并显示了当分子形成脂质双层时这些比例如何缩放。我介绍了BSW结构上丙酮和硫分子从表面增强的拉曼散射的表面增强实验结果，并表明BSW的激发导致观察到在裸棱镜上无法观察到的拉曼线。;我使用菲涅耳系数极分析得出设计支持远距离表面等离子体激元（LRSP）的多层结构并设计支持LRSP且传播长度约为2 mm的周期性多层结构的系统策略。考虑到生物传感应用，我推导了任意平面共振结构中标准表面传感参数的半解析表达式，并比较了所设计LRSP结构的精确计算和近似计算。

著录项

  • 作者

    Delfan, Aida.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Physics.;Optics.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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