ADOPT - Adaptive Optics for THz

ADOPT - 太赫兹自适应光学

• 批准号: 424616052
• 负责人: Professor Dr.-Ing. Christoph Ament
• 金额: --
• 依托单位: Proffesur für Mikroaktorik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/424616052?language=en
• 关键词: ADOPT; Adaptive; Optics; THz

Electromagnetic beam steering, especially in the THz range, is attracting more and more attention with respect to communication (6G) or sensing and imaging. While various transmit- or reflectarrays have recently been developed for these purposes, their efficiency is still limited compared to simple metal reflectors. Combined beam steering and focusing requires a multi-actuator system that allows a rotational as well as a linear shift of mirrors with large working ranges. Multistable cooperative actuator systems fulfill these requirements. A prominent example is the main mirror of the James Webb space telescope that makes use of hexagonal mirror elements in combination with actuators for the individual alignment of each mirror. Within this project, we therefore address the combination of cooperative multistable linear and rotational actuators for Adaptive Optics for THz - ADOPT. ADOPT builds upon our research from our former project Kick and Catch where we elaborated a bi-stable out-of-plane movement of a freely movable mass and quasi-continuous tilt angles of spheres. Now, we will take the next steps: We will integrate both mechanisms from Kick and Catch in one device with a larger number of stable positions. The single integrated elements will be arranged in an array to prove the final overall function, i.e., an adaptive THz mirror. Each mirror element consists of a piston, which can reach multiple vertical resting positions by an impulse-like acceleration from its initial position and a subsequent catch in the desired levitation position. On top of the setup, a sphere cap with an attached hexagonal mirror plate can be rotated by many small subsequent impulses. Seven of these elements will then be arranged to form a module, which will lay the foundations for larger systems with more modules. This allows synchronous redirecting as well as refocusing by adjusting the curvature. Due to the large wavelength of THz radiation, there are only few requirements for imaging, while a large field of view and relative deflection of the single mirrors are important. The system provides a cooperation of a piezoelectric kick and magnetic catch within a linear system and an all-electrostatic tilt system. The set-up will be strongly miniaturized, it comprises micro actuators, multistability, internal sensing and control. Four research groups will join forces to tackle the challenges of the new cooperative actuation concepts of ADOPT. Two of the four partners, Ulrike Wallrabe and Martin Hoffmann, have a long-term focus on microactuators. Tamara Bechtold is an expert in modeling and system-level simulation of multiphysical systems. Finally, Christoph Ament provides the expertise in control theory with a focus on nanopositioning.

电磁波束转向，特别是在THz范围内，在通信（6 G）或传感和成像方面吸引了越来越多的关注。虽然最近已经开发了用于这些目的的各种发射或反射阵列，但与简单的金属反射器相比，它们的效率仍然有限。组合的光束转向和聚焦需要多致动器系统，其允许具有大工作范围的反射镜的旋转以及线性移位。多稳态协同作动器系统满足这些要求。一个突出的例子是詹姆斯·韦伯太空望远镜的主镜，它使用六边形反射镜元件与致动器相结合，用于每个反射镜的单独对准。在这个项目中，我们因此解决了合作的多稳态线性和旋转致动器的自适应光学太赫兹- ADOPT的组合。ADOPT建立在我们以前的项目Kick and Catch的研究基础上，在该项目中，我们阐述了自由移动质量的双稳态平面外运动和球体的准连续倾斜角。现在，我们将采取下一步行动：我们将把Kick和Catch的两种机制集成到一个具有更多稳定位置的设备中。单个集成元件将排列成阵列以证明最终的整体功能，即，自适应太赫兹反射镜每个反射镜元件由活塞组成，该活塞可以通过从其初始位置的脉冲式加速到达多个垂直静止位置，并且随后捕获在期望的悬浮位置。在该装置的顶部，一个带有六边形镜板的球帽可以通过许多微小的后续脉冲旋转。然后将其中七个元素排列成一个模块，这将为具有更多模块的更大系统奠定基础。这允许通过调整曲率来同步重定向以及重新聚焦。由于太赫兹辐射的波长很大，对成像的要求很少，而大的视场和单个反射镜的相对偏转是很重要的。该系统提供了一个线性系统和全静电倾斜系统内的压电反冲和磁性捕获的合作。该装置将大大小型化，它包括微致动器，多稳态，内部传感和控制。四个研究小组将联手应对ADOPT新的合作驱动概念的挑战。四个合作伙伴中的两个，Ulrike Wallrabe和Martin Hoffmann，长期专注于微执行器。Tamara Bechtold是多物理系统建模和系统级仿真方面的专家。最后，Christoph Ament提供了控制理论方面的专业知识，重点是纳米定位。