Colloidal plasmonic nanostructures for enhanced emission and optical nonlinearity.

用于增强发射和光学非线性的胶体等离子体纳米结构。

• 批准号: 1111799
• 负责人: Philippe Guyot-Sionnest
• 金额: $ 27.19万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1111799&HistoricalAwards=false
• 关键词: Colloidal; plasmonic; nanostructures; enhanced; emission

Technical AbstractWith support from the Macromolecular, Supramolecular, and Nanochemistry program in the Chemistry Division at NSF, the PI will synthesize colloidal elongated gold and silver nanoparticles and will study their integration with semiconductor and polymer materials. Through the controlled assembly of these materials, the project will produce nanoscale nonlinear optical switches and fast single photon sources. Three separate research thrusts will be pursued: (1) Fast nanoscale nonlinear optical switching will be sought by coating an Au bipyramid with or embedding it in a medium exhibiting an optical Kerr effect. Feedback between the intensity-dependent refractive index of the medium and the index-sensitive resonant electric field enhancement can support optical bistability on subpicosecond time scales. (2) Picosecond single photon sources will be designed to take advantage of the large and anisotropic field enhancement of a bipyramid, speeding its radiative rate and defining its polarization state. (3) Since silver is a better plasmonic material than Au at optical frequencies and there are no existing synthesis of small monodispersed Ag antenna with narrow Plasmon resonance, the PI will undertake synthetic strategies to produce monocrystalline Ag nanorods with good shape yield and monodispersity using in particular underpotential deposition (UPD) of lower work function metals to control surface energy and stability.Non-Technical AbstractWith support from the Macromolecular, Supramolecular, and Nanochemistry program in the Division of Chemistry at NSF, this project will impact three separate scientific areas: colloidal synthesis, plasmonic materials, and education. Colloidal synthesis is a field still in its infancy and this project will focus on the development of new methods to control both the shape of the particle and its assembly into more complex structures. Electronic processing has changed society profoundly, and the processing of light is already ubiquitous in telecommunications and promises to continue to develop. Ultrafast nanoscale optical switches and single photon sources must be developed as part of this progress, and this project will chemically produce and characterize these two basic but essential elements. The research project will educate two PhD students to become skilled and creative scientists at the frontier in an interdisciplinary research area, intersecting physics and chemistry. The PI will also develop curricular materials and optical demonstrations to bring an understanding of the properties of light and colloidal materials to disadvantaged high school students and to the public at large.

技术摘要在美国国家科学基金会化学部大分子、超分子和纳米化学计划的支持下，PI将合成胶体细长的金和银纳米颗粒，并将研究它们与半导体和聚合物材料的集成。通过这些材料的受控组装，该项目将生产纳米级的非线性光学开关和快速单光子源。将进行三个不同的研究：(1)通过在具有光学克尔效应的介质中涂覆或嵌入Au双金字塔来寻求快速纳米级的非线性光学开关。介质的强度相关折射率和折射率敏感的共振电场增强之间的反馈可以支持亚皮秒时间尺度上的光学双稳态。(2)皮秒单光子源将被设计成利用双金字塔的大而各向异性的场增强，加快其辐射速率并定义其偏振态。(3)由于银在光学频率上是一种比金更好的等离子体材料，并且目前还没有与窄等离子体共振的小型单分散银天线的合成，PI将采取合成策略来生产具有良好形状产率和单分散性的单晶银纳米棒，特别是利用低功函数金属的欠电位沉积(UPD)来控制表面能量和稳定性。非技术摘要在美国国家科学基金会化学系高分子、超分子和纳米化学计划的支持下，该项目将影响三个独立的科学领域：胶体合成、等离子体材料和教育。胶体合成是一个仍处于初级阶段的领域，该项目将专注于开发新的方法来控制颗粒的形状及其组装成更复杂的结构。电子处理深刻地改变了社会，光处理在电信中已经无处不在，并有望继续发展。作为这一进展的一部分，必须开发超快纳米级光学开关和单光子源，该项目将从化学上生产和表征这两种基本但必不可少的元素。该研究项目将培养两名博士生，使他们成为物理学和化学交叉学科研究领域的前沿技术和创造性科学家。国际学生联合会还将开发课程材料和光学演示，使贫困高中生和广大公众了解光和胶体材料的性质。