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光镊技术被广泛应用在俘获和操纵微纳米尺寸颗粒,目前被研究学者普遍接受的俘获吸光性颗粒的机理为光泳力.本文实现了对空气中被俘获的吸光性颗粒的红外显微观测.当激光器功率为1.0 W时,成功观测到被俘获墨粉颗粒(直径约7μm)和甲苯胺蓝颗粒(直径约为1—20μm)的温升约为14 K,为光泳力理论提供了强有力的证据.另外,首次用可见光显微镜和红外显微镜同时观测到被俘获颗粒的周期振荡现象,并分析了振荡现象的产生机理.
Optical tweezers technology is widely used in trapping and manipulating micro-nano-sized particles, and the mechanism of capturing light-absorbing particles generally accepted by researchers is light-wave force.The infrared microscopic observation of the captured light-absorbing particles in the air is realized in this paper. When the laser power was 1.0 W, the temperature rise of captured toner particles (about 7μm in diameter) and toluidine blue particles (about 1-20μm in diameter) was successfully observed to be about 14 K, which provided a strong force for photodynamic theory In addition, the periodic oscillations of the captured particles were observed simultaneously with a visible light microscope and an infrared microscope for the first time, and the generation mechanism of the oscillation phenomenon was analyzed.