Broadband Terahertz Polarimetry for Photonic and Biomedical Applications

用于光子和生物医学应用的宽带太赫兹偏振测量

• 批准号: 1407683
• 负责人: Dale Winebrenner
• 金额: $ 29.99万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2019-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1407683&HistoricalAwards=false
• 关键词: Broadband; Terahertz; Polarimetry; Photonic; Biomedical

Proposal Title:Broadband Terahertz Polarimetry for Photonic and Biomedical AppllicationsInstitution: University of WashingtonThe proposed project will make significant contributions in imaging and sensing applications of various types of objects and materials and will contribute significantly to health monitoring, homeland security and medical applications. The broad scientific importance of terahertz technology is attested by the number of research programs and publications working to develop terahertz metrology techniques for a broad range of applications, including medical imaging, organic and polymer material science, and study of chiral molecules, amino acids and metamaterials. In particular, polarimetric methods will contribute to an understanding of physical interaction mechanisms and device physics in a range of applications. Our effort includes support for active dissemination of polarimetric capability to the broader research community. Moreover, this project is structured so as to enhance undergraduate and graduate research opportunities at the University of Washington, by providing training to student instrumentalists in terahertz polarimetric methods. Additionally, experimental results and research findings through this project will be disseminated in the form of guest lectures in a graduate-level course in Photonics. Finally, throughout this project, we will endeavor to identify and recruit female, disabled and under-represented minority students, at both undergraduate and graduate levels. Polarization measurement and ellipsometry are essential research techniques for investigating properties of new materials in many areas of basic sciences, which also find immediate industrial and biomedical applications. Broadband polarization measurement in the terahertz frequency regime presently suffers from several significant limitations: (1) Current terahertz polarimetry techniques offer only coarse polarization resolution and small isolation between orthogonal polarization channels, due in significant part to (2) poor ability to calibrate THz polarimeters, as a results of high frequency-dependent power loss in external polarizers; moreover (3) current terahertz polarimetry techniques require rotation of external polarizers to pre-determined fixed angles and positions, which burdens the system with lower measurement speed and inaccuracies in rotational polarizer placement.We propose development of a novel broadband terahertz polarimeter that combines two recent advancements in terahertz source and detector technology: A. Coherent control of complex polarizations of terahertz waves generated in gas plasmas, and B. Measurement of sample-induced ellipticity and cross-polarization using a novel full polarimetric broadband terahertz spectroscopy setup. Integrating these two techniques, we will demonstrate a polarization-agile terahertz polarimetry system capable of investigating cross-polarization and chirality of a wide variety of natural and manufactured targets. We will in particular demonstrate applications of the new polarimeter in two important applications, namely diagnosis of healthy and burned mammalian skin tissue and characterization of photonic devices based on graphene and nano-stuctured materials.

建议题目：宽带太赫兹偏振光子和生物医学应用机构：华盛顿大学拟议的项目将作出重大贡献，在成像和传感应用的各种类型的物体和材料，并将作出重大贡献，健康监测，国土安全和医疗应用。太赫兹技术的广泛科学重要性由致力于开发用于广泛应用的太赫兹计量技术的研究计划和出版物的数量证明，包括医学成像，有机和聚合物材料科学，以及手性分子，氨基酸和超材料的研究。特别是，极化方法将有助于理解的物理相互作用机制和设备物理在一系列的应用。我们的努力包括支持向更广泛的研究界积极传播极化能力。此外，该项目的结构是为了通过向学生仪器操作员提供太赫兹偏振测量方法的培训，增加华盛顿大学本科生和研究生的研究机会。此外，通过该项目的实验结果和研究成果将以客座讲座的形式在研究生阶段的光子学课程中传播。最后，在整个项目中，我们将奋进在本科和研究生两级确定和招募女性，残疾人和代表性不足的少数民族学生。 偏振测量和椭圆偏振测量是研究基础科学许多领域中新材料性质的基本研究技术，也可立即用于工业和生物医学应用。太赫兹频率范围内的宽带偏振测量目前受到几个显著的限制：（1）当前的太赫兹偏振测量技术仅提供粗略的偏振分辨率和正交偏振通道之间的小隔离，这在很大程度上是由于（2）作为外部偏振器中的高频率相关功率损耗的结果，校准太赫兹偏振计的能力差;（3）目前的太赫兹偏振测量技术需要将外部偏振器旋转到预定的固定角度和位置，这使得系统的测量速度较低并且旋转偏振器放置不准确。A.气体等离子体中产生的太赫兹波的复偏振的相干控制，和B。利用一种新的全极化宽带太赫兹光谱装置测量样品诱导的椭圆率和交叉极化。结合这两种技术，我们将展示一个偏振捷变太赫兹偏振测量系统能够调查交叉偏振和手性的各种各样的自然和制造的目标。我们将特别展示新旋光仪在两个重要应用中的应用，即健康和烧伤哺乳动物皮肤组织的诊断和基于石墨烯和纳米结构材料的光子器件的表征。