Electrically modulated varifocal liquid lenses, which are usually modulated by an external high voltage power source, have attracted much attention due to their bright application prospects in artificial optical systems. Here, a triboelectric nanogenerator (TENG)-based varifocal liquid lens (TVLL) has been demonstrated, in which the focal length can be directly modulated by external mechanical sliding. A dielectrophoretic force is generated by the TENG through the transfer of triboelectric charges in the asymmetric electrodes, which is used to continuously change the shape of the air–liquid interface between concave and convex without any complicated boost converter. Moreover, a triboelectric magnifying glass based on the accurate modulation effect of the TVLL on a light beam has been demonstrated. In this work, the TENG is used as a medium to modulate and accurately control the focal length of the liquid lens by an external mechanical stimulus, which may have great applications in micro-optical-electro-mechanical systems (MOEMS), human–machine interaction, artificial vision systems, etc.

通常由外部高压电源调制的电调制变焦液体透镜因其在人工光学系统中的广阔应用前景而备受关注。在这里，已经展示了基于摩擦纳米发电机（TENG）的变焦液体透镜（TVLL），其中焦距可以通过外部机械滑动直接调制。TENG通过不对称电极中摩擦电荷的转移产生介电泳力，用于连续改变凹凸之间的气液界面形状，无需任何复杂的升压转换器。此外，还展示了基于 TVLL 对光束的精确调制效应的摩擦电放大镜。在这项工作中，