SCALING OF MICROCAVITY PLASMAS TOWARD 1 um: SCIENCE AND ENGINEERING OF SPATIALLY-CONFINED, LOW TEMPERATURE PLASMAS

将微腔等离子体缩小至 1 微米：空间受限低温等离子体的科学与工程

• 批准号: 0853739
• 负责人: James Eden
• 金额: $ 10万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0853739&HistoricalAwards=false
• 关键词: SCALING; MICROCAVITY; PLASMAS; TOWARD; um

0853739EdenThis research aims to produce ultra-small-sized plasmas as small as 1 micrometer in diameter and then to determine their properties using laser and other optical techniques. Microplasmas, operated at sizes of 0.5 mm and below, offer exciting new possibilities for plasma applications and scientific study. They can have very high power density yet can operate continuously at atmospheric pressure and higher. Recent studies have shown that plasmas so confined behave quite differently from macroscale plasmas such as in a fluorescent lamp or a neon sign. It is expected that as plasmas are reduced to sizes previously unattainable, they will become increasingly cold and dense and resemble a liquid.Microplasmas will be generated within cavities having a characteristic dimension below 20 µm. Electron and neutral gas temperatures, and electron and excited state number densities will be studied primarily by optical techniques such as inverse bremsstrahlung and laser-induced fluorescence. Spatially resolved studies will also be conducted with a recently constructed vacuum/optical system having an integrated microscope. By using plasma channels with cross-sectional dimensions approaching those of conventional optical waveguides (~2-10 µm), new opportunities are created for monitoring the microplasma optically by coherent and incoherent processes such as Raman scattering, and the results can be compared with simulations. Laser probing experiments will also investigate the interaction between a gas-phase plasma and an e--h+ plasma in hybrid microplasma/semiconductor devices.A key component of this program is educational outreach, critical aspects of which focus on undergraduates and a close interaction with science teachers in a semi-rural school district in east central Illinois, primarily at the junior high school level. At least one science teacher will participate in research each summer, developing plasma/optical experiments for students to be integrated into both the junior and senior high school curricula. Such outreach is meant to attracting more women and underrepresented minorities to this field, while increasing the interest of all precollege students in the physical sciences.

0853739 Eden这项研究旨在产生直径小至1微米的超小尺寸等离子体，然后使用激光和其他光学技术确定其特性。 微等离子体，在0.5毫米及以下的尺寸操作，等离子体应用和科学研究提供了令人兴奋的新的可能性。 它们可以具有非常高的功率密度，但可以在大气压和更高的压力下连续工作。 最近的研究表明，等离子体如此局限的行为完全不同于宏观尺度的等离子体，如在荧光灯或氖灯。随着等离子体被缩小到以前无法达到的尺寸，它们将变得越来越冷和密集，并类似于液体。微等离子体将在特征尺寸小于20 µm的空腔内产生。 电子和中性气体的温度，电子和激发态数密度将主要通过光学技术，如逆韧致辐射和激光诱导荧光进行研究。 空间分辨的研究也将进行与最近建造的真空/光学系统具有集成的显微镜。 通过使用截面尺寸接近传统光波导（~2-10 µm）的等离子体通道，为通过相干和非相干过程（如拉曼散射）光学监测微等离子体创造了新的机会，并且可以将结果与模拟进行比较。 激光探测实验还将研究混合微等离子体/半导体器件中气相等离子体和电子-氢+等离子体之间的相互作用。该计划的一个关键组成部分是教育推广，其关键方面集中在大学生和与伊利诺斯州中东部半农村学区的科学教师的密切互动，主要是在初中水平。 每年夏天，至少有一名科学教师将参加研究，为学生开发等离子体/光学实验，将其纳入初中和高中课程。 这种推广活动旨在吸引更多的妇女和代表性不足的少数民族进入这一领域，同时提高所有大学预科学生对物理科学的兴趣。