Megahertz Light Steering Without Moving Parts
Megahertz Light Steering Without Moving Parts
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DOI：
10.1109/cvpr52729.2023.00009
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
A. Pediredla;S. Narasimhan;M. Chamanzar;Ioannis Gkioulekas
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文献类型：
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作者：
A. Pediredla;S. Narasimhan;M. Chamanzar;Ioannis Gkioulekas
我们推出了一种光转向技术，该技术以兆赫频率运行，没有移动部件，成本不到一百美元。我们的技术可以使许多严重依赖高速、可靠、低成本和与波长无关的光控制的投影仪和成像系统受益，包括激光扫描投影仪、LiDAR 传感器和荧光显微镜。我们的技术使用超声波在可压缩介质（例如水）内产生时空变化的折射率场，将介质变成动态移动透镜。通过控制产生波的超声波换能器的电输入，我们可以改变透镜，从而以声速（水中 1.5 公里/秒）控制光线。我们构建了该技术的物理原型，使用它以兆赫兹速率实现不同的扫描技术（比振镜扫描仪等商业替代品快三个数量级），并演示概念验证投影仪和激光雷达应用。为了鼓励这项新技术的进一步创新，我们推导了其基本限制的理论，并开发了用于虚拟设计的物理精确模拟器。我们的技术为在各种应用中实现高速、低成本的光转向提供了一个有前景的解决方案。
We introduce a light steering technology that operates at megahertz frequencies, has no moving parts, and costs less than a hundred dollars. Our technology can benefit many projector and imaging systems that critically rely on high-speed, reliable, low-cost, and wavelength-independent light steering, including laser scanning projectors, LiDAR sensors, and fluorescence microscopes. Our technology uses ultrasound waves to generate a spatiotemporally-varying refractive index field inside a compressible medium, such as water, turning the medium into a dynamic traveling lens. By controlling the electrical input of the ultrasound transducers that generate the waves, we can change the lens, and thus steer light, at the speed of sound (1.5 km/s in water). We build a physical prototype of this technology, use it to realize different scanning techniques at megahertz rates (three orders of magnitude faster than commercial alternatives such as galvo mirror scanners), and demonstrate proof-of-concept projector and LiDAR applications. To encourage further innovation towards this new technology, we derive theory for its fundamental limits and develop a physically-accurate simulator for virtual design. Our technology offers a promising solution for achieving high-speed and low-cost light steering in a variety of applications.