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Design of plasmonic nanostructures for an enhanced control over their ultrafast nonlinear optical response.

设计等离子体纳米结构，以增强对其超快非线性光学响应的控制。

基本信息

批准号：
EP/J015393/1
负责人：
Anatoly Zayats
金额：
$ 47.8万
依托单位：
King's College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2013
资助国家：
英国
起止时间：
2013 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FJ015393%2F1
关键词：
Design plasmonic nanostructures enhanced control

项目摘要

After a decade of existence, and driven by a remarkable expansion in research and development, plasmonics -the technology that exploit the unique optical properties of metallic nanostructures to enable routing and actively manipulating light at the nanoscale- has entered a defining period in which researchers will seek to answer a critical question: can plasmonics provide a viable technological platform which includes both passive and active nanodevices? The design of these devices is driven by a two-fold objective: 1) to manipulate electromagnetic energy at the nanoscale, including harvesting, guiding and transferring energy, with high lateral confinement down to a few tens of nanometers, and 2) to generate ultrafast (a few femtoseconds) and strong non-linear effects with low operating powers to produce basic active functions such as transistor or lasing actions. Utilizing the resonant properties -field enhancement and spectral sensitivity- of Surface Plasmons Polaritons (SPPs) is generally thought to represent a practical avenue to achieving this objective. However, our ability to control and manipulate light at this scale dynamically -i.e. to produce active functionalities- and in real-time through low-energy external control signals is a missing link in our aim to develop a fully integrated sub-wavelength optical platform. To date, active plasmonic systems, including thermo- and electro-optic media, quantum dots, and photochromic molecules, are achieving sensitive progress in switching and modulation applications. However, high switching times (>nanosecond) or the need for relatively strong control energy (~microJ/cm^2) to observe sensible signal modulation (35% to 80%), limit the practical use of such structures as signal processing or other active opto-electronic nanodevices.In this context, this research aims to assess the potential for defects to enhance the non-linear optical properties of hybrid plasmonic crystals. The objective is to integrate defects, made of plasmonic cavities, in plasmonic crystals to create a focal point for electromagnetic energy stored in surface plasmon waves at the crystal's interfaces. The role of the defect is then to transfer this energy to a neighbouring non-linear material in order to change its optical properties at the femtosecond timescale, thus creating an active functionality. This research, largely based on ultrafast time-resolved near-field optical microscopy, is also expected to enhance our understanding of ultrafast energy transfers at the nanoscale- a critical expertise in designing nanodevices.

经过十年的存在，并在研究和开发的显着扩张的驱动下，等离子体-利用金属纳米结构的独特光学特性，使路由和主动操纵光在纳米级的技术-已经进入了一个决定性的时期，研究人员将寻求回答一个关键问题：等离子体能提供一个可行的技术平台，其中包括被动和主动纳米器件？这些器件的设计受到双重目标的驱动：1）在纳米级操纵电磁能量，包括收集，引导和转移能量，具有低至几十纳米的高横向限制，以及2）以低操作功率产生超快（几飞秒）和强非线性效应，以产生基本的有源功能，如晶体管或激光作用。利用表面等离子体激元（SPP）的共振特性-场增强和光谱灵敏度-通常被认为是实现这一目标的实用途径。然而，我们在这种规模下动态控制和操纵光的能力-即产生有源功能-以及通过低能量外部控制信号实时控制和操纵光的能力是我们开发完全集成的亚波长光学平台的目标中缺少的一环。迄今为止，包括热光和电光介质、量子点和光致变色分子在内的主动等离子体系统在开关和调制应用中取得了敏感的进展。然而，高开关时间（>纳秒）或需要相对较强的控制能量（~微J/cm ^2）来观察敏感的信号调制（35%至80%），限制了这种结构作为信号处理或其他有源光电纳米器件的实际应用。目的是将由等离子体腔体制成的缺陷集成到等离子体晶体中，以在晶体的界面处为存储在表面等离子体波中的电磁能量创建焦点。然后，缺陷的作用是将这种能量转移到相邻的非线性材料，以便在飞秒时间尺度上改变其光学特性，从而产生活性功能。这项研究主要基于超快时间分辨近场光学显微镜，也有望提高我们对纳米级超快能量转移的理解-这是设计纳米器件的关键专业知识。