Dynamic Liquid Optics

动态液体光学

• 批准号: 530820785
• 负责人: Professor Dr. Hans Zappe
• 金额: --
• 依托单位: Professur für Mikrooptik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/530820785?language=en
• 关键词: Dynamic; Liquid; Optics

The power of tunable optics based on optofluidics stems from the ability to controllably deform liquid interfaces to a desired shape for a refractive surface. Using electrowetting as an actuation technique, tunable liquid lenses, prisms, and scanners have been demonstrated, and recently it has even been shown that surfaces with controlled optical aberrations may be generated. Key to many of these developments has been the use of a tubular fluidic structure with a high density of azimuthally-distributed and individuallyaddressable actuation electrodes. Yet the capabilities of liquid optics for realizing advanced imaging systems can be extended further, and the DynaLO project will attempt to demonstrate an entirely new means for controllably generating arbitrary liquid surface profiles, namely through time-varying surface waves in the lens. With the unique capabilities of the 32-electrode tubular lenses developed by the PI in prior work, the ability to generate precisely-controlled traveling and standing waves across the lens aperture will be analyzed theoretically and experimentally. Inspired by the wave patterns which can be generated in 25 m diameter wave tanks using mechanical actuators, the DynaLO project will translate this concept to a 5 mm liquid lens. It is expected that such dynamic surface waves can be used to generate a wide variety of surface features, also non-circularly-symmetric ones, which cannot be achieved using static actuation. This novel dynamic surface shaping will then be combined with static surface shaping as well as feedback-stabilized interface positioning to allow the generation of an even wider range of optical freeform surfaces. The liquid profile will be monitored in real time and interface variations due to, for example, orientation changes of the lens or system vibrations, will be directly compensated. The ultimate goal will be a liquid lens for which actuation can be instantaneously and continuously adjusted to assure that the desired profile is generated. If successful, the dynamic surface wave approach combined with static interface shaping will open entirely new horizons for tunable liquid optical components.

基于光流体学的可调谐光学器件的能力源于将液体界面可控地变形为折射表面的期望形状的能力。使用电润湿作为致动技术，已经展示了可调谐液体透镜、棱镜和扫描仪，并且最近甚至已经显示可以产生具有受控光学像差的表面。许多这些发展的关键是使用具有高密度的方位角分布和单独可寻址的致动电极的管状流体结构。然而，液体光学实现先进成像系统的能力可以进一步扩展，DynaLO项目将试图展示一种全新的手段，可控地产生任意的液体表面轮廓，即通过时变表面波的透镜。PI在先前工作中开发的32电极管状透镜具有独特的功能，将从理论和实验上分析在透镜孔径上产生精确控制的行波和驻波的能力。DynaLO项目的灵感来自于使用机械致动器在直径为25米的波浪水槽中产生的波浪图案，该项目将把这一概念转化为5 mm液体透镜。可以预期的是，这种动态表面波可以用于生成各种各样的表面特征，也可以是非圆形对称的表面特征，这是使用静态致动无法实现的。然后，这种新颖的动态表面成形将与静态表面成形以及反馈稳定的界面定位相结合，以允许生成更宽范围的光学自由曲面。将在真实的时间内监测液体分布，并且将直接补偿由于例如透镜的取向变化或系统振动而引起的界面变化。最终的目标将是一种液体透镜，其致动可以被瞬时地和连续地调节，以确保产生期望的轮廓。如果成功的话，结合静态界面成形的动态表面波方法将为可调谐液体光学元件开辟全新的视野。