Nanoscale Lamb wave-driven motors in nonliquid environments
Nanoscale Lamb wave-driven motors in nonliquid environments
复制标题
非液体环境中的纳米级兰姆波驱动电机
DOI：
10.1126/sciadv.aau8271
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发表时间：
2019-03-01
期刊：
影响因子：
13.6
通讯作者：
Qiu, Min
中科院分区：
文献类型：
--
作者：
Lu, Jinsheng;Li, Qiang;Qiu, Min
在非液体环境中实现光驱动运动面临着巨大的挑战，因为微型物体具有很强的干附着力，并且会以很强的韧性粘附在接触表面上。在这里，我们在空气和真空中展示了厚度约为 30 nm 的微米级金属板围绕微纤维旋转的旋转运动。该电机由引导到光纤中的脉冲光驱动，这是板上光激发兰姆波和板光纤几何形状的有利配置的协调结果。该电机由设计的光脉冲驱动，以亚纳米运动分辨率逐步爬行。此外，我们可以分别通过改变重复率和脉冲功率来控制旋转速度和步长分辨率。然后基于该电机演示了分辨率为 0.001 度的光驱动微镜扫描。它为集成微光机电系统、外太空全光学精密机械和控制以及微型激光雷达系统的激光扫描提供了前所未有的应用潜力。
Achieving light-driven motions in nonliquid environments presents formidable challenges, because microsized objects experience strong dry adhesion and intend to be stuck to contact surfaces with great tenacity. Here, in air and vacuum, we show rotary locomotion of a micrometer-sized metal plate with similar to 30 nm thickness, revolving around a microfiber. This motor is powered by pulsed light guided into the fiber as a coordinated consequence of an optically excited Lamb wave on the plate and favorable configuration of plate-fiber geometry. The motor, actuated by designed light pulses, crawls stepwise with subnanometer locomotion resolution. Furthermore, we can control the rotation velocity and step resolution by varying the repetition rate and pulse power, respectively. A light-actuated micromirror scanning with 0.001 degrees resolution is then demonstrated on the basis of this motor. It offers unprecedented application potential for integrated micro-opto-electromechanical systems, outer-space all-optical precision mechanics and controls, and laser scanning for miniature lidar systems.