Physics and applications of a novel nanometer-sized femtosecond electron souce
新型纳米级飞秒电子源的物理及应用
基本信息
- 批准号:137912904
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Priority Programmes
- 财政年份:2009
- 资助国家:德国
- 起止时间:2008-12-31 至 2015-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The project aims at understanding and controlling highly nonlinear photoemission processes at sharp metallic needles triggered by ultrashort pulses of near-, mid- and far-infrared radiation. In the first funding phase of this project, we demonstrated access to a new regime in photoemission from nanostructures, in which the electrons’ kinetic energies are no longer determined by the photon energy and the work function alone, but rather by the interaction of the electrons with the locally enhanced optical near-field at the apex of the needles. In the second funding phase, a main objective lies in the manipulation of these processes by a number of means, including (i) multiple pulses of varying wavelength, such as THz pulses, (ii) control over the carrier-envelope phase and (iii) gating of electron pulses by means of surface plasmon polariton fields. Using these approaches, we plan to reach a previously unachieved level of control over the femtosecond and attosecond electron dynamics at this nanostructure, which will manifest itself in modifications of the angular and kinetic energy distributions of electrons emitted from the excitation region. In addition to the study of fundamental properties of the emission and acceleration process, we will extend the efforts regarding the application of this pulsed electron source with high spatial coherence. Specifically, we will experiment with spatially resolving electron energy loss spectroscopy on nanowires and multilayer graphene in a point-projection geometry.
该项目旨在了解和控制由近、中和远红外辐射的超短脉冲触发的尖锐金属针的高度非线性光电发射过程。在该项目的第一个资助阶段,我们展示了从纳米结构获得光电发射的新机制,其中电子的动能不再仅由光子能量和功函数决定,而是由电子与针尖处局部增强的光学近场的相互作用决定。在第二资助阶段,主要目标在于通过多种手段操纵这些过程,包括(i)变化波长的多个脉冲,例如THz脉冲,(ii)对载波包络相位的控制,以及(iii)通过表面等离子体激元极化激元场来选通电子脉冲。使用这些方法,我们计划达到以前未实现的水平控制飞秒和阿秒电子动力学在这个纳米结构,这将体现在从激发区发射的电子的角和动能分布的修改。除了研究发射和加速过程的基本特性外,我们还将努力扩展这种具有高空间相干性的脉冲电子源的应用。具体来说,我们将实验空间分辨电子能量损失谱纳米线和多层石墨烯在一个点投影几何。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professor Dr. Christoph Lienau, Ph.D.其他文献
Professor Dr. Christoph Lienau, Ph.D.的其他文献
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{{ truncateString('Professor Dr. Christoph Lienau, Ph.D.', 18)}}的其他基金
Fluctuation-dominated materials for advanced photonics
用于先进光子学的涨落主导材料
- 批准号:
278748183 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Priority Programmes
Understanding and controlling optical excitations in individual hybrid nanostructures
了解和控制单个混合纳米结构中的光激发
- 批准号:
173363039 - 财政年份:2010
- 资助金额:
-- - 项目类别:
Research Grants
Exciton-plasmon interaction in metal-semiconductor hybrid nanostructures
金属-半导体混合纳米结构中的激子-等离子体相互作用
- 批准号:
138525804 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Priority Programmes
Optical excitation transfer via optical near-field interactions: devices and characterizations
通过光学近场相互作用的光激发传输:设备和表征
- 批准号:
94622341 - 财政年份:2008
- 资助金额:
-- - 项目类别:
Research Grants
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