Resonant Gap Nanoparticle Chains, with Application to Surface Enhanced Raman Scattering

共振间隙纳米粒子链，及其在表面增强拉曼散射中的应用

• 批准号: 0901383
• 负责人: Kevin Webb
• 金额: $ 40万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0901383&HistoricalAwards=false
• 关键词: Resonant; Gap; Nanoparticle; Chains; Application

Objective:Metal dimer, slot-cavity, and nanoparticle chain optical structures that operate based on resonant gap modes will be designed and compared using numerical electromagnetic simulations, in order to arrive at candidate designs for fabrication. Dielectric gratings with 2-10 nm line width will be fabricated with high-resolution lithography, atomic layer deposition and selective etching. Such gratings will be imprinted into metal films to form smooth and narrow trenches, thereby achieving designed resonant slot and chain waveguides. Fabricated structures will be tested using near-field and far-field approaches as a function of wavelength, in order to evaluate field enhancement and guiding performance. Raman measurements will be performed to determine the enhancement.Intellectual Merit:Nanoparticles with resonant gaps can provide large field enhancement for nonlinear optics and spectroscopy. The fabrication techniques to be developed will achieve line widths of a few nanometers, a length scale of tremendous interest yet not accessible with standard top-down lithography.Broader Impacts:Two Ph.D. students will be supported, and this research will constitute a substantial part of their theses. An undergraduate research student will be invited to work on this project each year. Material from this research will be used as demonstrations in entry-level graduate and senior-level undergraduate classes taught by Webb and Qi, and incorporated, as appropriate, into Purdue EPICS (engineering projects in community service), a design experience for undergraduates. Simulation tools developed will be accessible through the investigators Purdue web sites.

目的：金属二聚体，槽腔，和纳米颗粒链光学结构的谐振间隙模式的基础上进行操作，将设计和比较使用数值电磁模拟，以达到候选设计制造。利用高分辨率光刻、原子层淀积和选择性刻蚀技术制作线宽为2-10 nm的介质光栅。这种光栅将被压印到金属薄膜中，形成光滑而狭窄的沟槽，从而实现设计的谐振槽和链波导。将使用近场和远场方法测试制造的结构作为波长的函数，以评估场增强和引导性能。拉曼测量将被执行，以确定增强。智力优点：纳米粒子与共振间隙可以提供大的非线性光学和光谱学的场增强。待开发的制造技术将实现几纳米的线宽，这是一个非常令人感兴趣的长度尺度，但无法用标准的自顶向下光刻技术实现。学生将得到支持，这项研究将构成他们论文的重要组成部分。每年将邀请一名本科研究生参与该项目。从这项研究的材料将被用来作为示范在入门级研究生和高级本科班教授的韦伯和齐，并酌情纳入普渡大学EPICS（工程项目在社区服务），本科生的设计经验。开发的模拟工具将通过普渡大学的网站访问。