物理学报Issue(2)：028701-1-028701-6,6.DOI:10.7498/aps.63.028701
空间散斑场捕获大量吸光性颗粒及其红外显微观测
Trapping of multiple particles by space speckle field and infrared microscopy
摘要
Abstract
Optical tweezer technology is widely used in trapping and manipulating micro-and nano-sized particles, mainly including the trapping of transparent particles in water and the trapping of absorbing particles in air. In this paper, a frosted glass diffuser is irradiated by laser beam, and a subjective speckle field is generated in the image plane of a lens after the laser has transmitted the lens. The speckle field is spatially distributed, and contains multiple bright spots and dark spots. A large number of dark spots surrounded by bright spots are spatial energy traps, and can be used to trap a large number of absorbing particles. The sizes and densities of trapped particles are about 2-8 µm and 1-2 g/cm3. In addition, an infrared microscope is used to record the infrared images of the particles trapped by the speckle field, and the infrared images show that the temperature of trapped particles rises by absorbing the light energy, which verifies that the mechanism of trapping absorbing particles by speckle field is photophoretic force.关键词
光镊/空间散斑场/光泳力/红外显微Key words
optical tweezers/space speckle field/photophoretic force/infrared microscopy引用本文复制引用
张志刚,刘丰瑞,张青川,程腾,伍小平..空间散斑场捕获大量吸光性颗粒及其红外显微观测[J].物理学报,2014,(2):028701-1-028701-6,6.基金项目
国家重点基础研究发展计划(批准号:2011CB302105)、国家自然科学基金(批准号:11332010,11102201)、中央高校基本科研业务费专项资金(批准号：WK2090050017)和中国科学院科研装备研制项目(批准号：YZ201265)资助的课题.@@@@ Project supported by the National Basic Research Program of China (Grant No.2011CB302105), the National Natural Science Foundation of China (Grant Nos.11332010,11102201), the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. WK2090050017), and the Instrument Developing Project of Chinese Academy of Science (Grant No. YZ201265) （批准号:2011CB302105）
