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Silver nanowire hyperlenses

银纳米线超透镜

基本信息

批准号：
270871479
负责人：
Professor Dr. Carsten Reinhardt
金额：
--
依托单位：
Institut für Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/270871479?language=en
关键词：
Silver nanowire hyperlenses

项目摘要

Due to the hyperbolic dispersion relation for electromagnetic waves, hyperbolic metamaterials like silver nanowire arrays allow the transformation of evanescent waves into propagating waves. This is of special importance for subwavelength imaging and focussing of light. Although several hyperlens geometries have been theoretically studied, only one early design based on bent metal/dielectric multilayers has experimentally been realised up to now. Particularly, the use of metal nanowire arrays for hyperlenses was not experimentally demonstrated yet although theory suggests a multitude of advantages for these nanowire lenses, e.g. large operating bandwidth, low loss, easy fabrication, and plane surfaces. We therefore intend to theoretically investigate and experimentally demonstrate the subwavelength focusing and imaging ability of such nanowire hyperlenses using two different designs of hyperlenses based on silver nanowire arrays. By electrochemical deposition of silver into nanoporous alumina templates and structuring of the top surface, the silver nanowire hyperlenses will exhibit a plane bottom surface for imaging and focus creation. The lenses allow the focusing of incident plane waves and, by reversing the light path, the formation of far-field images from near-field subwavelength-sized objects. Absorption is expected to be lower than for multilayer hyperlenses, which mainly operate close to the surface plasmon resonance. Due to the broadband hyperbolic dispersion relation of the nanowire arrays, lenses for different wavelengths of choice can be realised, which are not bound to a specific limiting frequency, given by a particular material combination. Moreover, the fabrication of the nanowire hyperlenses promises to be robust and less demanding than the deposition of ultra-low-roughness metal/dielectric multilayers. Applying white light SNOM and multi-photon lithography, the subwavelength focus formation will be studied. The influence of spatial dispersion on focus size and imaging will be investigated by adjusting period and diameter of the silver nanowires. Furthermore, the impact of absorption, especially for large wave vectors, as another limiting parameter will be evaluated. Besides the direct experimental results on nanofocusing and subwavelength imaging the work will be important for the newly sparked interest in enhanced thermal radiation due to the offered large photonic density of states in the hyperbolic metamaterial. This might further open ways to apply silver nanowire metamaterials with specifically shaped top surfaces for enhanced radiative cooling.

由于电磁波的双曲色散关系，银纳米线阵列等双曲超材料可以将倏逝波转变为传播波。这对于亚波长成像和光聚焦特别重要。尽管已经从理论上研究了几种超透镜几何形状，但迄今为止仅在实验上实现了一种基于弯曲金属/电介质多层的早期设计。特别是，尽管理论表明这些纳米线透镜具有许多优点，但金属纳米线阵列在超级透镜中的使用尚未得到实验证明。工作带宽大、损耗低、易于制造、表面平坦。因此，我们打算使用两种不同的基于银纳米线阵列的超级透镜设计，从理论上研究并通过实验证明这种纳米线超级透镜的亚波长聚焦和成像能力。通过将银电化学沉积到纳米多孔氧化铝模板中并结构化顶面，银纳米线超透镜将呈现出用于成像和焦点创建的平面底面。这些透镜可以聚焦入射平面波，并通过反转光路，从近场亚波长大小的物体形成远场图像。预计吸收率低于多层超透镜，后者主要在表面等离子体共振附近工作。由于纳米线阵列的宽带双曲色散关系，可以实现用于不同波长选择的透镜，其不受特定材料组合给出的特定限制频率的限制。此外，纳米线超透镜的制造有望比超低粗糙度金属/电介质多层膜的沉积更加坚固且要求更低。应用白光SNOM和多光子光刻技术，研究亚波长焦点的形成。通过调整银纳米线的周期和直径，研究空间色散对焦点尺寸和成像的影响。此外，还将评估吸收的影响，特别是对于大波矢量，作为另一个限制参数。除了纳米聚焦和亚波长成像的直接实验结果之外，由于双曲超材料提供了大的光子态密度，这项工作对于新激发的增强热辐射的兴趣也很重要。这可能进一步开辟应用具有特定形状顶面的银纳米线超材料以增强辐射冷却的方法。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

The Interaction of Guest Molecules with Co-MOF-74: A Vis/NIR and Raman Approach.

DOI：
10.1002/anie.201801966
发表时间：
2018-06
期刊：
Angewandte Chemie
影响因子：
0
作者：
Ina Strauss;Alexander Mundstock;Dominik Hinrichs;Rasmus Himstedt;A. Knebel;C. Reinhardt;Dirk Dorfs
通讯作者：
Ina Strauss;Alexander Mundstock;Dominik Hinrichs;Rasmus Himstedt;A. Knebel;C. Reinhardt;Dirk Dorfs

Nanofabrication of High-Resolution Periodic Structures with a Gap Size Below 100 nm by Two-Photon Polymerization