CAREER: Development of A Scalable Spin-Coating Technological Platform for Colloidal Self-Assembly and Templating Nanofabrication

职业：开发用于胶体自组装和模板纳米加工的可扩展旋涂技术平台

• 批准号: 0744879
• 负责人: Peng Jiang
• 金额: $ 40万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-03-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0744879&HistoricalAwards=false
• 关键词: CAREER; Development; Scalable; Spin; Coating

0744879JiangPhotonic crystals and plasmonics are two key techniques that will ultimately enable alloptical integrated circuits and quantum information processing. Unfortunately, the development and implementation of these techniques have been greatly impeded by expensive and painstaking topdown nanofabrication (e.g., electron-beam lithography), which limit the available sample size to less than 1 mm2. By contrast, bottom-up colloidal self-assembly and templating nanofabrication provide a much simpler, faster, and inexpensive alternative to nanolithography in creating highly ordered photonic crystals and plasmonic nanostructures. However, the traditional colloidal self-assembly and templating approach suffers from low throughput, incompatibility with standard microfabrication, and limited crystal structures which greatly hamper the mass-production and on-chip integration of practical nanooptical devices.Intellectual Merit. This proposal aims to develop understanding and control of a robust spin-coating technology that combines the simplicity and cost benefits of bottom-up self-assembly with the scalability and compatibility of top-down microfabrication. This will enable the creation of wafer-scale photonic crystals and a large variety of functional subwavelength-structured materials. The research plan has four specific objectives: (1) elucidate the basic crystallization mechanisms by which unusual nonclose-packed colloidal crystals form during spin-coating, (2) determine the photonic band gap properties of shear-aligned colloidal photonic crystals, (3) investigate the surface plasmon properties of templated periodic metallic nanostructures, including enhanced optical transmission through subwavelength nanohole arrays and surface-enhanced Raman scattering (SERS) on nanovoid gratings, and (4) develop biomimetic subwavelength-structured antireflection coatings for high-efficiency solar cells. The proposed experimental and theoretical investigation will lead to significant breakthroughs in a wide spectrum of fields ranging from all-optical integrated circuits to plasmonic sensors to sustainable energy. Improved fundamental understanding of flow-induced crystallization and melting within non-uniform shear flows, a topic that has received little or no examination, will also result. The creative and original components of the research plan rely on the integration of the above four objectives. Insights gained into basic mechanisms facilitate better control over the crucial crystalline parameters for tailoring the optical properties in the later objectives. Most importantly, the periodic plasmonic nanostructures and subwavelength-structured antireflection coatings are indeed 2-D photonic crystals, and are thus studied with similar experimental (optical spectroscopy) and modeling (rigorous coupled-wave analysis) techniques as photonic crystals. The unification of these apparently different but intrinsically interconnected fields under one umbrella ? the spin-coating platform could lead to new optical features that are interesting fundamentally and technologically.Broader Impacts. In conjunction with student mentorship and curriculum development activities, the closely integrated educational plan focuses on developing several outreach activities to educate K-12 students and teachers as well as the general public on nanooptics and self-assembly. An educational display for the Florida Museum of Natural History?s ?Butterfly Rainforest Center? will be created to disseminate the nanooptical mechanisms of the striking blue colors of morpho butterfly wings and the antireflection properties of butterfly eyes, along with how to mimic these natural photonic crystals and antireflection coatings using colloidal self-assembly. Direct participation of high school students from underrepresented groups in the research program and development of educational modules on making brilliant artificial opals through collaboration with high school teachers will be sought through several successful programs at the university. The spin-coating platform will advance many other areas that depend on the creation of large-area periodic nanostructures not covered by this proposal, ranging from high-density magnetic recording to bio-microanalysis. The integrated educational program will impact students at all education levels. Outreach efforts through a local museum will bring modern nanooptics to young students and adults through a fun learning experience and participation of high school students in the research program will benefit the students and their larger communities. Collaborative efforts with high school teachers to develop colorful demonstration modules will favorably impact hundreds of students per year at the secondary level with a low annual cost ($1,000) and help the program to spread outside the State of Florida.

0744879Jiang光子晶体和等离子体激元是最终实现全光集成电路和量子信息处理的两项关键技术。不幸的是，这些技术的开发和实施受到昂贵且艰苦的自上而下纳米加工（例如电子束光刻）的极大阻碍，这将可用的样品尺寸限制为小于 1 mm2。相比之下，自下而上的胶体自组装和模板纳米加工在创建高度有序的光子晶体和等离子体纳米结构方面提供了比纳米光刻更简单、更快速且廉价的替代方案。然而，传统的胶体自组装和模板方法存在吞吐量低、与标准微加工不兼容以及晶体结构有限等问题，极大地阻碍了实用纳米光学器件的大规模生产和片上集成。该提案旨在加深对强大旋涂技术的理解和控制，该技术将自下而上自组装的简单性和成本效益与自上而下微加工的可扩展性和兼容性结合起来。这将使晶圆级光子晶体和多种功能性亚波长结构材料的创建成为可能。 该研究计划有四个具体目标：（1）阐明旋涂过程中形成不寻常的非密堆积胶体晶体的基本结晶机制，（2）确定剪切排列胶体光子晶体的光子带隙特性，（3）研究模板化周期性金属纳米结构的表面等离子体特性，包括通过亚波长纳米孔阵列增强光传输和纳米空隙光栅上的表面增强拉曼散射（SERS），以及(4)开发用于高效太阳能电池的仿生亚波长结构减反射涂层。 所提出的实验和理论研究将在从全光集成电路到等离子体传感器到可持续能源的广泛领域带来重大突破。还将提高对非均匀剪切流中流动诱导结晶和熔化的基本理解，这一主题很少或根本没有受到研究。研究计划的创造性和原创性部分依赖于上述四个目标的整合。对基本机制的深入了解有助于更好地控制关键晶体参数，从而调整后续物镜的光学特性。最重要的是，周期性等离子体纳米结构和亚波长结构抗反射涂层确实是二维光子晶体，因此可以使用与光子晶体类似的实验（光学光谱）和建模（严格的耦合波分析）技术进行研究。将这些表面上不同但本质上相互关联的领域统一在一个保护伞下？旋涂平台可以带来从根本上和技术上都很有趣的新光学特征。更广泛的影响。结合学生辅导和课程开发活动，紧密结合的教育计划侧重于开展多项外展活动，以对 K-12 学生和教师以及公众进行纳米光学和自组装方面的教育。 佛罗里达自然历史博物馆“蝴蝶雨林中心”的教育展览将创建传播大闪蝶翅膀引人注目的蓝色和蝴蝶眼睛的抗反射特性的纳米光学机制，以及如何使用胶体自组装来模拟这些天然光子晶体和抗反射涂层。通过大学的几个成功项目，将寻求来自代表性不足群体的高中生直接参与研究计划，并通过与高中教师合作开发制作精美人造蛋白石的教育模块。 旋涂平台将推进许多其他依赖于本提案未涵盖的大面积周期性纳米结构创建的领域，从高密度磁记录到生物微分析。综合教育计划将影响各个教育层次的学生。通过当地博物馆的推广工作将通过有趣的学习体验为年轻学生和成年人带来现代纳米光学，高中生参与研究项目将使学生及其更大的社区受益。与高中教师合作开发丰富多彩的演示模块，每年将以较低的年度成本（1,000 美元）对数百名中学学生产生有利影响，并帮助该项目在佛罗里达州以外的地区推广。