论文部分内容阅读
光镊技术被广泛应用于捕获和操纵微纳米尺寸颗粒,主要包括捕获水中透明性颗粒和空气中吸光性颗粒两种类型.本文用激光束照射毛玻璃散射片,透射光经透镜会聚后在透镜的像平面附近产生了主观散斑场.该散斑场为空间分布,包含大量的亮斑和暗斑.大量由亮斑包围的暗斑如同一个个空间能量陷阱,被用来捕获大量的吸光性墨粉颗粒,被捕获颗粒的尺寸约2—8μm,密度约1—2 g/cm3.采用红外显微镜拍摄到空间散斑场捕获颗粒的红外像,红外图像显示被捕获颗粒吸光后温度升高,证实了空间散斑场捕获吸光性颗粒的机理为光泳力原理.
Optical tweezers technology is widely used to capture and manipulate micro-nano-size particles, including the capture of transparent particles in water and air-absorbing particles in two types.In this paper, the laser beam irradiation frosted glass diffuser, the transmitted light through the lens after the convergence of the lens A subjective speckle field is created in the vicinity of the image plane. The speckle field is spatially distributed and contains a large number of bright spots and dark spots. A large number of dark spots, surrounded by bright spots, act like space energy traps and are used to capture large amounts of light The size of the captured particles is about 2-8μm and the density is about 1-2 g / cm 3. The infrared speckle field of the space speckle field is taken by an infrared microscope to capture the infrared image of the particles, the infrared image shows that the temperature of the captured particles increases after absorbing light, Confirmed the spatial speckle field capture light-absorbing particles mechanism for the principle of photophoretic force.