Investigation of Science and Technology of THz Air Plasma

太赫兹空气等离子体科技研究

• 批准号: 1229968
• 负责人: Xi-Cheng Zhang
• 金额: $ 33万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1229968&HistoricalAwards=false
• 关键词: Investigation; Science; Technology; THz; Air

Objective The development of remote, broadband THz wave sensing technology is lagging behind the compelling needs that exist in the areas of astronomy, global environmental monitoring, and homeland security. This is due to the challenge posed by high absorption by ambient moisture in the THz range. The objective of this proposal is to investigate THz air-plasma technology to meet this great challenge. Intellectual merit Ambient air, when excited with intense femtosecond laser beams, exhibits a remarkable ability to generate and detect pulsed THz waves through an optical nonlinear process. The use of air-plasma as a broadband THz wave emitter and THz wave sensor provides superior frequency bandwidth (0.1 - 40 THz), peak field strength ( 1MV/cm), sensitivity (heterodyne), and resolution ( MHz). We propose to measure the ?rectified? THz field inside of the plasma filament with two-color laser beams by using the optical Stark effect to explore the limitation. Broader impact The greatest demand for THz imaging is in the form of a nondestructive evaluation system. Suppliers within the fields of defense and homeland security are seeking ways to better sense chemical and biological weapons and explosives. Our proposed development of the THz air-plasma project will provide key technology that will enable interdisciplinary research and advance numerous THz wave sensing and imaging developments. As interdisciplinary research, this renewal project will continue to provide excellent collaborative opportunities to promote teaching, training, and learning among students with diverse ethnic backgrounds and within underrepresented groups.

目的：远距离宽带太赫兹波传感技术的发展滞后于天文学、全球环境监测和国土安全等领域的迫切需求。这是由于THz范围内环境水分的高吸收所带来的挑战。本提案的目的是研究太赫兹空气等离子体技术，以满足这一巨大的挑战。环境空气，当被强烈的飞秒激光束激发时，表现出通过光学非线性过程产生和检测脉冲太赫兹波的显着能力。使用空气等离子体作为宽带THz波发射器和THz波传感器提供了上级的频率带宽（0.1 - 40 THz）、峰值场强（1 MV/cm）、灵敏度（外差）和分辨率（MHz）。我们建议测量？纠正？利用光学斯塔克效应探讨双色激光束作用下等离子体灯丝内部THz场的极限。THz成像的最大需求是无损评估系统。国防和国土安全领域的供应商正在寻求更好地感知化学和生物武器以及爆炸物的方法。我们提出的太赫兹空气等离子体项目的发展将提供关键技术，使跨学科的研究和推进许多太赫兹波传感和成像的发展。作为跨学科研究，这个更新项目将继续提供绝佳的合作机会，以促进不同种族背景和代表性不足群体的学生的教学、培训和学习。