Author:
Zhang Zhi-Gang ,Liu Feng-Rui ,Zhang Qing-Chuan ,Cheng Teng ,Wu Xiao-Ping ,
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.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
Reference27 articles.
1. Grier D G 2003 Nature 424 810
2. MacDonald M P, Spalding G C, Dholakla K 2003 Nature 426 421
3. Baumgartl J, Mazilu M, Dholakia K 2008 Nature Photon. 2 675
4. Brzobohatý, Karásek V, Šiler M, Chvátal L, Čižmár T, Zemánek P 2013 Nature Photon. 7 123
5. Horstmann M, Probst K, Fallnich C 2012 Lab. on a Chip. 12 295
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献