RUI: Laser Photoelectron Beam Sources

RUI：激光光电子束源

• 批准号: 8618807
• 负责人: Gail Massey
• 金额: $ 26.4万
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-01 至 1990-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8618807&HistoricalAwards=false
• 关键词: RUI; Laser; Photoelectron; Beam; Sources

The goal of this research is to investigate the characteristics of intense electron beam sources based on laser-generated photoelectrons at the surface of an organic thin film on a metal substrate. Recent work has demonstrated that high current densities and large total currents can be generated by laser illumination of conventional photocathodes in ultrahigh vacuum environments, and also that organic thin films can serve as excellent photoelectron sources. The advantages of organic films include greatly reduced vacuum requirements and ease of fabrication. This project will determine the energies, energy spreads, angular divergences, and apparent source sizes of photoelectrons from organic-thin films. The temporal behavior of the emission will be investigated with various laser wavelengths and pulse lengths. Films containing active molecules in a host, and more than one type of active molecule, will be evaluated, as well as coatings of a single material. Substrate effects will also be explored. A kinetic model of the emission process will be developed to explain the temporal and spectral characteristics. The proposed research program is an investigation of new techniques and materials, particularly nonlinear organic thin films, which can be used to generate electron beams of high current density under intense illumination by a laser. Electron beams of high brightness can be used for integrated circuit lithographic exposure, for instruments such as microprobes and electron microscopes; for point- source X-ray generation, and for large scale devices such as accelerators and free electron lasers. Laser-generated results indicate that kiloampere currents can be produced easily. Synchronized emission from multiple emitters as well as optically controlled beam shapes are possible with this technique. Because high current densities and small spot sizes with extremely rapid spot deflection can be achieved, the interaction of these beams with semiconductors should make possible some very useful signal processing and switching applications.

本研究的目的是调查 基于激光产生光电子的强电子束源. 金属基板上的有机薄膜的表面。 最近的工作 已经证明，高电流密度和大的总电流 可以通过传统光电阴极的激光照射产生， 在真空环境中，有机薄膜可以 作为优良的光电子源。 有机的优势 薄膜包括大大降低的真空要求和容易的 制造。这个项目将决定能量，能量传播， 角发散，和表观源大小的光电子从 有机薄膜 发射的时间行为将是 研究了不同的激光波长和脉冲长度。 膜 在宿主中含有活性分子，并且不止一种类型的活性分子 分子，将进行评估，以及涂层的单一材料。 还将探讨底物效应。 本文提出了一个动力学模型， 发射过程将发展到解释的时间和光谱 特色 拟议的研究计划是调查 新技术和新材料，特别是非线性有机薄膜， 其可用于产生高电流密度的电子束 在激光的强烈照射下。 高电子束 亮度可用于集成电路光刻曝光， 微探针和电子显微镜等仪器;对于点- 源X射线生成，以及用于大型设备， 加速器和自由电子激光器。 激光生成的结果表明 千安培电流可以很容易地产生。 同步发射 来自多个发射器以及光学控制的光束形状， 可能通过这项技术。因为高电流密度和小 可以实现具有极快光点偏转的光点尺寸， 这些光束与半导体的相互作用， 非常有用的信号处理和开关应用。