Nanophotonic Tomography – Peering below plasmonic waves

纳米光子断层扫描 – 观察等离子体波

• 批准号: 2330513
• 负责人: Pieter Kik
• 金额: $ 35.25万
• 依托单位: The University of Central Florida Board of Trustees
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2330513&HistoricalAwards=false
• 关键词: Nanophotonic; Tomography; Peering; below; plasmonic

Surface plasmon polariton waves have become a key ingredient in applications that manipulate light at the nanoscale, i.e. in nanophotonic applications. When light hits a metal surface it causes electrons to oscillate, in some cases generating ripples or waves in the charge density at the metal surface. Such waves, known as surface plasmon polaritons (SPPs), allow for extreme light concentration and highly sensitive optical detection. While the existence of SPP waves is well known, it is extremely challenging to investigate their behavior below the metal surface. To address this challenge, this project will study sub-surface nanophotonic effects by measuring light emission from thin metallic layers placed at different depths below the surface. This layer-by-layer analysis of the optical response at the nanoscale is referred to as nanophotonic tomography. The systematic analysis of such thin-film light emission will be used for depth-resolved studies of SPP waves in nanophotonic systems that have practical applications, including photocatalysis and hot electron enhanced photovoltaics. In addition to bringing fundamental understanding of key nanophotonic phenomena, the research will be integrated in Nanophotonics course materials.Depth profiling of surface plasmon polaritons is a highly challenging proposition. The proposed work leverages recent insights in the generation and detection of gold photoluminescence (PL). Based on the observation of detectable Au PL from few-nm thick gold layers, it has become feasible to use embedded thin gold films as 2D probes of local field enhancement. Based on this realization, layer-by-layer gold PL analysis will be applied to geometries that are of great current importance to the fields of plasmonics and nanophotonics: (a) the “particle on mirror” geometry, where nanophotonic tomography will be used to map the depth over which hot electrons and holes contribute to Au photoluminescence, (b) the zero-mode waveguide (ZMW) with an embedded nanoparticle, in which layering of the surrounding ZMW enables depth-selective quantitative analysis of gap plasmon field amplitudes, (c) Metasurface-enhanced Raman scattering, where layered metallic metasurfaces will allow for a quantitative correlation of Raman scattering enhancement from 2D materials and Au PL, and (d) sub-surface few-nm Au films in Ag for the investigation of hot carrier redistribution by monitoring the excitation-energy dependence of modifications to the Au PL spectrum. The knowledge gained from the research is of great importance to applications in biosensing, photocatalysis, and hot-electron assisted photovoltaics. In addition, the proposed work will provide a clear and comprehensive body of work on using gold PL as a general probe of internal optical fields. The results are anticipated to be of great value to the general field of nanophotonics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

表面等离子体极化波已经成为操纵纳米级光线（即在纳米光子应用中）的应用中的关键要素。当光撞击金属表面时，它会导致电子振荡，在某些情况下，在金属表面的电荷密度中产生波纹或波浪。这样的波，称为表面等离子体极化子（SPP），可以极高的光浓度和高度敏感的光学检测。尽管SPP波的存在是众所周知的，但要研究其在金属表面以下的行为是极其挑战的。为了应对这一挑战，该项目将通过测量位于表面以下不同深度的薄金属层的光发射来研究地下纳米光子效应。纳米级光学响应的​​逐层分析称为纳米疗法。对这种薄膜光发射的系统分析将用于对具有实际应用的纳米光系统中SPP波的深度分解研究，包括光催化和热电子增强的光伏。除了对关键的纳米光子现象带来基本的了解之外，该研究还将集成到纳米光学课程材料中。表面等离子体偏振子的深入分析是一项巨大的挑战性建议。提出的工作利用了在金光致发光（PL）的产生和检测中的最新见解。基于从几米厚的金层观察到可检测到的AU PL，将嵌入式薄金膜用作局部田间增强的2D问题是可行的。 Based on this realization, layer-by-layer gold PL analysis will be applied to geometries that are of great current importance to the fields of plasmamonics and nanophotonics: (a) the “particle on mirror” geometry, where nanophotonic tomography will be used to map the depth over which hot electronics and holes contribute to Au photoluminescence, (b) the zero-mode waveguide (ZMW) with an嵌入的纳米颗粒，其中周围ZMW的分层可以对间隙等离子体电场场放大器进行深度选择性定量分析，（c）跨表面增强的拉曼散射，其中分层的金属跨度可以允许对2D材料和Au au au pl，au au au pl，au pl，d）的定量相关性，（通过监测修饰对AU PL频谱的兴奋能量依赖性来研究热载体重新分布。从研究中获得的知识非常重要，对于生物传感，光催化和热电子辅助光伏的应用非常重要。此外，拟议的工作将为使用金色PL作为内部光场的一般探测提供清晰而全面的工作。预计该结果对纳米光学的一般领域具有很大的价值。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响标准，被视为通过评估而被视为珍贵的支持。