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首页> 外文学位 >A new technique to transfer metallic nanoscale patterns to small and non-planar surfaces: Application to a fiber optic device for surface enhanced Raman scattering detection.
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A new technique to transfer metallic nanoscale patterns to small and non-planar surfaces: Application to a fiber optic device for surface enhanced Raman scattering detection.

机译：一种将金属纳米级图案转移到小的非平面表面的新技术：在用于表面增强拉曼散射检测的光纤设备中的应用。

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摘要

This thesis focuses on the development of a bidirectional fiber optic probe for the detection of surface enhanced Raman scattering (SERS). One facet of this fiber-based probe featured an array of coupled optical antennas, which we designed to enhance the Raman signal of nearby analytes. When this array interacted with an analyte, it generated SERS signals specific to the chemical composition of the sample; some of these SERS signals coupled back into the fiber. We used the other facet of the probe to input light into the fiber and collect the SERS signals that coupled into the probe. In this dissertation, the development of the probe is broken into three sections: (i) characterization of antenna arrays, (ii) fabrication of the probe, and (iii) device measurements.;In the first section we present a comprehensive study of metallic antenna arrays. We carried out this study to determine the effects of antenna geometry, spacing, and composition on the surface plasmon resonance (SPR) of a coupled antenna array; the wavelength range and strength of the SPR are functions of the shape and interactions of the antennas. The SPR of the array ultimately amplified the Raman signal of analytes and produced a measurable SERS signal, thus determination of the optimal array geometries for SERS generation was an important first step in the development of the SERS fiber probe.;We then introduce a new technique developed to fabricate the SERS fiber probes. This technique involves transferring antenna arrays (created by standard lithographic methods) from a large silicon substrate to a fiber facet. We developed this fabrication technique to bypass many of the limitations presented by previously developed methods for patterning unconventional substrates (i.e. small and/or non-planar substrates), such as focused ion-beam milling and soft lithography.;In the third section of this thesis, we present SERS measurements taken with the fiber probe. We constructed a measurement system to couple light into the probe and filter out background noise; this allowed simultaneous detection of multiple chemicals. Antenna array enhancement factor (EF) calculations are shown; these allowed us to determine that the probe efficiently collected SERS signals.
机译：本文着重研究用于表面增强拉曼散射（SERS）检测的双向光纤探头的开发。这种基于光纤的探头的一个方面具有一系列耦合的光学天线，我们设计这些天线以增强附近分析物的拉曼信号。当该阵列与分析物相互作用时，它会生成特定于样品化学成分的SERS信号；这些SERS信号中的一些会耦合回光纤。我们使用探头的另一面将光输入到光纤中，并收集耦合到探头中的SERS信号。本文将探头的开发分为三个部分：（i）天线阵列的表征，（ii）探头的制造和（iii）器件测量。在第一部分中，我们对金属材料进行了全面的研究。天线阵列。我们进行了这项研究，以确定天线几何形状，间距和成分对耦合天线阵列的表面等离子体共振（SPR）的影响。 SPR的波长范围和强度是天线形状和相互作用的函数。阵列的SPR最终放大了分析物的拉曼信号并产生了可测量的SERS信号，因此确定SERS生成的最佳阵列几何结构是SERS光纤探针开发的重要的第一步。开发用于制造SERS光纤探头。该技术涉及将天线阵列（通过标准光刻方法创建）从大型硅基板传输到光纤端面。我们开发了这种制造技术，以绕过先前开发的用于图案化非常规基板（即小和/或非平面基板）的方法所带来的许多限制，例如聚焦离子束铣削和软光刻。论文中，我们介绍了使用光纤探针进行的SERS测量。我们构建了一个测量系统，将光耦合到探头中并滤除背景噪声。这样可以同时检测多种化学物质。显示了天线阵列增强因子（EF）的计算；这些使我们能够确定探头有效地收集了SERS信号。

著录项

  • 作者

    Smythe, Elizabeth Jennings.;

  • 作者单位

    Harvard University.;

  • 授予单位 Harvard University.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 144 p.
  • 总页数 144
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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