石墨烯光推进原理分析及光驱动特性测试研究

Optical propulsion is a propulsion method that converts light energy into kinetic energy. Graphene has unique optoelectronic properties, which is an essential prerequisite for developing optical propulsion technology. The development of graphene optical propulsion technology was introduced. Three kinds of mechanisms of graphene photo propulsion were dislussed, such as electron jet, Knudsen force, and laser ablation. Moreover, the order of the driving force generated by the electron jet and the Knudsen force was calculated. It is believed that Knudsen force is more likely to be the cause of light driving phenomenon. In this paper, the surface temperature of the graphene sponge under laser irradiation on one side and the unirradiated side was characterizd by using a small force measurement method of a suspended wire swing. The noticeable temperature difference was formed between the two surfaces, and heat was mainly concentrated on the irradiated surface. The influence of vacuum degree on the magnitude of the optical driving force was discussed. The results show that the photo-driving force of graphene is in the micro-newton order. Thermal effect plays a dominant role in optical driving force. When the laser irradiation power is constant, a low vacuum degree (1~10 Pa) is a suitable environment for generating the photo-driving force, which indirectly indicates the possibility that the photo-driving force of graphene mainly comes from the Knudsen force.