Improvement of the axial trapping effect using azimuthally polarised trapping beam

doi:10.1088/1674-1056/19/11/119401

中国物理B ›› 2010, Vol. 19 ›› Issue (11): 119401-119401.doi: 10.1088/1674-1056/19/11/119401

Improvement of the axial trapping effect using azimuthally polarised trapping beam

李雪璁, 孙秀冬

Department of Physics, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2010-04-27 修回日期:2010-06-08 出版日期:2010-11-15 发布日期:2010-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10674037), the National Basic Research Program of China (Grant No. 2007CB307001), and the program of excellent Team in Harbin Institute of Technology of China.

Improvement of the axial trapping effect using azimuthally polarised trapping beam

Li Xue-Cong(李雪璁) and Sun Xiu-Dong(孙秀冬)^†

Department of Physics, Harbin Institute of Technology, Harbin 150001, China

Received:2010-04-27 Revised:2010-06-08 Online:2010-11-15 Published:2010-11-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10674037), the National Basic Research Program of China (Grant No. 2007CB307001), and the program of excellent Team in Harbin Institute of Technology of China.

摘要/Abstract

摘要： A dual optical tweezers system, which consists of a doughnut mode optical tweezer (DMOT) with the azimuthally polarised trapping beam and a solid mode optical tweezer (SMOT) with the Gauss trapping beam was constructed to compare the axial trapping effect of DMOT and SMOT. The long-distance axial trapping of ST68 microbubbles (MBs) achieved by DMOT was more stable than that of SMOT. Moreover the axial trapping force measured using the viscous drag method, was depended on the diameter of the particle, the laser power, and the numerical aperture (NA) of the objective lens. The measurement of the axial trapping force and the acquisition of CCD images of trapping effect confirmed that the DMOT showed excellent axial trapping ability than SMOT. A simple and effective method is developed to improve axial trapping effect using the azimuthally polarized beam as trapping beam. This is helpful for the long-distance manipulating of particles especially polarised biological objects in axial direction.

Abstract: A dual optical tweezers system, which consists of a doughnut mode optical tweezer (DMOT) with the azimuthally polarised trapping beam and a solid mode optical tweezer (SMOT) with the Gauss trapping beam was constructed to compare the axial trapping effect of DMOT and SMOT. The long-distance axial trapping of ST68 microbubbles (MBs) achieved by DMOT was more stable than that of SMOT. Moreover the axial trapping force measured using the viscous drag method, was depended on the diameter of the particle, the laser power, and the numerical aperture (NA) of the objective lens. The measurement of the axial trapping force and the acquisition of CCD images of trapping effect confirmed that the DMOT showed excellent axial trapping ability than SMOT. A simple and effective method is developed to improve axial trapping effect using the azimuthally polarized beam as trapping beam. This is helpful for the long-distance manipulating of particles especially polarised biological objects in axial direction.

Key words: optical tweezers, azimuthally polarised beam, axial trapping force, ST68 microbubbles

中图分类号: (Beam characteristics: profile, intensity, and power; spatial pattern formation)

42.60.Jf

李雪璁, 孙秀冬. Improvement of the axial trapping effect using azimuthally polarised trapping beam[J]. 中国物理B, 2010, 19(11): 119401-119401.

Li Xue-Cong(李雪璁) and Sun Xiu-Dong(孙秀冬). Improvement of the axial trapping effect using azimuthally polarised trapping beam[J]. Chin. Phys. B, 2010, 19(11): 119401-119401.

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Improvement of the axial trapping effect using azimuthally polarised trapping beam

Improvement of the axial trapping effect using azimuthally polarised trapping beam

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