U.S.-Japan Cooperative Research: Laser-Surface Interactionsat High Excitation Density

美日合作研究：高激发密度下的激光与表面相互作用

• 批准号: 8916097
• 负责人: Richard Haglund
• 金额: $ 1.27万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916097&HistoricalAwards=false
• 关键词: U.S.; Japan; Cooperative; Research; Laser

This award will support a two-year cooperative research project in physics between Dr. Richard F. Haglund, Jr., Department of Physics and Astronomy, Vanderbilt University, and Dr. Noriaki Itoh, Department of Physics, Nagoya University, Japan. They will study laser-induced desorption (laser sputtering) in semiconductors and insulators, and especially the effect of high electronic excitation density on such desorption. The high density results from the intensity of the laser light and the strong absorption of it that takes place in the irradiated material, leading to a comparatively large concentration of excited valence-band electrons. The scientists hope to obtain a clearer picture of the ways in which the electronic energy delivered by laser photons to dielectric and semiconductor surfaces is absorbed, transformed, and ultimately dissipated through defect generation, bond-breaking, and desorption. The program is designed to take advantage of unique facilities, experience, and interests in the two laboratories: the initial studies will be carried out with visible and ultraviolet lasers on well-characterized compound-semiconductor surfaces in Japan; at Vanderbilt, alkali halides and alkaline-earth fluorides will be studied using both time-resolved optical desorption and photoelectron spectroscopies. Use of a free-electron laser due to become operational at Vanderbilt in 1990 is also planned in these experiments. The interaction of laser light with various materials has been a subject of great interest almost from the invention of the laser, for both technological and scientific reasons. The development of substrates and coatings for lasers inevitably involved such studies, for example. At the present time the operative physical mechanisms in many technological applications of laser-surface interactions, such as laser-assisted thin-film deposition and laser microlithography, are not well characterized. It is the aim of this collaborative research project to contribute to a fundamental understanding of these interactions.

该奖项将支持一个为期两年的合作研究项目， 理查德·F.小哈格伦德，物理系 范德比尔特大学天文学系教授伊藤纪明博士 日本名古屋大学物理系。 他们将研究 半导体中的激光诱导解吸（激光溅射）， 绝缘体，特别是高电子激发的影响 在这样的脱附上密度。 高密度是由 激光的强度和强吸收， 发生在被照射的材料中，导致相对 受激价带电子的大浓度。 的 科学家们希望能更清楚地了解 由激光光子传递到电介质的电子能量， 半导体表面被吸收，转化，最终 通过缺陷产生、键断裂和解吸而消散。 该计划旨在利用独特的设施， 经验，并在两个实验室的利益：最初的 将用可见光和紫外激光进行研究， 在日本的化合物半导体表面;在 范德比尔特，碱金属卤化物和碱土金属氟化物将是 研究使用时间分辨光学解吸和光电子 光谱学 自由电子激光器的使用将成为 1990年在范德比尔特投入使用的飞机也计划在这些地区使用。 实验 激光与各种材料的相互作用一直是一个研究热点。 这是一个几乎从激光发明开始就引起人们极大兴趣的问题，因为 技术和科学的原因。 的发展 用于激光器的基底和涂层不可避免地涉及这些研究， 比如 目前， 在激光-表面相互作用的许多技术应用中， 例如激光辅助薄膜沉积和激光 显微光刻，没有很好地表征。 这就是目的 合作研究项目，以促进基本的 了解这些互动。