All-optical manipulation of micrometer-sized metallic particles  

作　　者：YUQUAN ZHANG XIUJIE Dou YANMENG DAI XIANYOU WANG CHANGJUN MIN AND XIAOCONG YUAN 

机构地区：[1]Nanophotonics Research Center, Shenzhen University, Shenzhen 518060, China

出　　处：《Photonics Research》2018年第2期66-71,共6页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(NSFC)(91750205,61377052,61422506,61427819,61605117);National Key Basic Research Program of China(973)(2015CB352004);National Key Research and Development Program of China(2016YFC0102401);Leading Talents of Guangdong Province Program(00201505);Natural Science Foundation of Guangdong Province(2016A030312010,2016A030310063);Excellent Young Teacher Program of Guangdong Province(YQ2014151)

摘　　要：Optical traps use focused laser beams to generate forces on targeted objects ranging in size from nanometers to micrometers. However, for their high coefficients of scattering and absorption, micrometer-sized metallic particles were deemed non-trappable in three dimensions using a single beam. This barrier is now removed. We demon- strate, both in theory and experiment, three-dimensional （3D） dynamic all-optical manipulations of micrometer- sized gold particles under high focusing conditions. The force of gravity is found to balance the positive axial optical force exerted on particles in an inverted optical tweezers system to form two trapping positions along the vertical direction. Both theoretical and experimental results confirm that stable 3D manipulations are achievable for these particles regardl for a variety of in-depth ess of beam polarization and wavelength. research requiting metallic particles. The present work opens up new opportunities .Optical traps use focused laser beams to generate forces on targeted objects ranging in size from nanometers to micrometers. However, for their high coefficients of scattering and absorption, micrometer-sized metallic particles were deemed non-trappable in three dimensions using a single beam. This barrier is now removed. We demonstrate, both in theory and experiment, three-dimensional(3D) dynamic all-optical manipulations of micrometersized gold particles under high focusing conditions. The force of gravity is found to balance the positive axial optical force exerted on particles in an inverted optical tweezers system to form two trapping positions along the vertical direction. Both theoretical and experimental results confirm that stable 3D manipulations are achievable for these particles regardless of beam polarization and wavelength. The present work opens up new opportunities for a variety of in-depth research requiring metallic particles.

关 键 词：（350.4855） Optical tweezers or optical manipulation （140.7010） Laser trapping （350 3950） Micro-optics. 

分 类 号：TN241[电子电信—物理电子学] TN92