Sensing and Analysis of THz-Radiation using the Coherence Function (SensATion)

使用相干函数 (SensATion) 感测和分析太赫兹辐射

• 批准号: 423266368
• 负责人: Professor Dr. Ralf Bernhard Bergmann
• 金额: --
• 依托单位: BIAS - Bremer Institut für Angewandte Strahltechnik GmbH
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/423266368?language=en
• 关键词: Sensing; Analysis; THz; Radiation; using

In the spectrum of electro-magnetic waves, Terahertz (THz) radiation is located between microwaves and the infrared spectrum with frequencies ranging from 100 GHz up to multiple THz and offers a number of significant advantages compared to other spectral regimes. While being non-ionizing, it can penetrate materials which are opaque to visible light. Additionally, the frequencies are in the range of molecular vibration, rotation and transition spectra, making it well suited to detect and identify chemicals and materials such as drugs and explosives for example. In the past decades various methods for coherent imaging in the THz range have been reported. They allow to exploite the wave nature of the radiation and therefore enable advanced applications, such as quantitative phase contrast imaging, digital holography, and ultra-fast spectroscopy.However, currently all of the available coherent imaging techniques in the THz range are based either on a superposed reference wave field, or a reference pulse for electronic gating. This constitutes a considerable lack in the state of the art, because in consequence there are currently no means to characterize a priori unknown THz radiation, e.g. emitted by antennas, non-linear photonic components, potentially self-luminous or stellar objects in a far distance or non-classical radiation in quantum optics.The goal of this project is to close the gap in the state of the art and to research and develop methods in order to provide reference free wave field sensing in the THz range. The approach shall be based on sampling of the mutual coherence function (i.e. the spatial coherence) using a shear interferometer. If successful, this would for the first time allow recording and analysis of a priori unknown THz radiation even in case of partial spatial coherence. Applications would range from characterization of photonic components, antennas, self-luminous and distant objects as well as investigations in quantum optics. Furthermore, currently existing applications in coherent imaging would largely benefit from a reference free technique. Avoiding the burden of guiding and controlling a reference wave enables novel flexible and compact coherent imaging sensors that can be moved around like a camera device.

在电磁波的光谱中，Terahertz（THZ）辐射位于微波和红外光谱之间，频率从100 GHz到多个THZ不等，与其他光谱方案相比，频率从100 GHz到多个THz。在非电场化的同时，它可以穿透不透明的材料到可见光。此外，这些频率在分子振动，旋转和过渡光谱的范围内，因此非常适合检测和识别药物和炸药等化学物质和材料。在过去的几十年中，已经报道了THZ范围内相干成像的各种方法。它们允许利用辐射的波性质，因此可以实现高级应用，例如定量相对比成像，数字全息图和超快速光谱。这构成了艺术状态的相当大的缺乏，因为因此目前没有手段来表征先验未知的THZ辐射，例如由天线，非线性光子成分，量子光学的远距离或非经典辐射的潜在自露或恒星对象发射。该项目的目的是缩小艺术状态的差距，并研究和开发方法，以便在THZ范围内提供参考范围的参考场传感。该方法应基于使用剪切干涉仪的相互相干函数（即空间相干性）的采样。如果成功的话，这将首次允许记录和分析先验未知的THZ辐射，即使在部分空间相干性的情况下。应用的范围从光子组件，天线，自露和远处的物体以及量子光学元件的研究范围。此外，目前在连贯成像中现有的应用将在很大程度上受益于参考技术。避免引导和控制参考波的负担可以使新颖的灵活和紧凑的相干成像传感器像相机设备一样四处移动。