针对现有柔性可调光栅响应速度慢、功耗高而无法广泛应用的现状, 提出一种基于石墨烯纳米片(graphene nanoplatelet, GNP)/聚二甲基硅氧烷(polydimethylsiloxane, PDMS)复合材料的近红外(near-infrared, NIR)光驱动可调谐柔性透射光栅结构。利用紫外线光刻技术制备出的光栅结构, 实现了柔性透射光栅与石墨烯复合材料薄膜的一体化。在光功率密度为220 mW·cm-2的近红外光驱动下, GNP/PDMS薄膜的温度变化约为120℃, 而且光栅在3 s内可实现2.7%的连续周期调谐。不同驱动频率下, 光栅栅距变化规律基本相同, 即光栅的光机械效应无显著的时间依赖性。

In flexible tunable gratings, their applications have been limited by their slow response times and high power consumption recently. In view of this situation, a near-infrared (nIR) light actuated tunable transmission optical grating based on graphene nanoplatelet (GNP)/polydimethylsiloxane (PDMS) and PDMS was proposed. By using the method of ultraviolet (UV) 1ithography, the grating structure integrating the grating with the actuating mechanism both made of soft elastomers was studied. The increase of temperature in GNP/PDMS membrane was around 120 °C under an actuation power density of 220 mW·cm-2 within a period of 3 s and the grating demonstrated continuous period tunability of 2.7%. In different nIR-driven cycles, the same grating period amplitude variation was showed, which indicated that the photomechanical response of the grating was independent of both time and history.