An approach for the realisation of active pulling/pushing laser beams for light-absorbing particles in the air is proposed and investigated. The approach is based on the use of a pair of cascaded diffractive optical elements generating first-order Bessel beams. The generated superimposed Bessel beams allow one to create self-imaging light fields in the form of optical bottle beam traps. In this case, the rotation of one of the cascaded elements causes the appearance of an additional phase difference between the superimposed beams, resulting in axial shifting of the generated self-imaging light patterns. During their movement, the trapped particles remain confined inside the dark regions of the generated light field. This approach allows one to easily realise so-called “optical conveyors”, which are crucial in the transportation and investigation of dangerous substances, viruses, living cells, or containers holding these substances. We believe that such optical conveyors based on photophoretic forces will find applications in future microdevices.

提出并研究了一种实现空气中吸光粒子主动拉/推激光束的方法。该方法基于使用一对产生一阶贝塞尔光束的级联衍射光学元件。产生的叠加贝塞尔光束允许以光学瓶光束陷阱的形式创建自成像光场。在这种情况下，级联元件之一的旋转导致在叠加光束之间出现附加的相位差，导致所产生的自成像光图案的轴向偏移。在它们的移动过程中，被捕获的粒子仍被限制在生成的光场的黑暗区域内。这种方法使人们可以轻松实现所谓的“光学传送带”，在运输和调查危险物质，病毒，活细胞或装有这些物质的容器中至关重要。我们相信，这种基于光电力的光学传送带将在未来的微型设备中找到应用。