中国激光, 2012, 39 (6): 0610001, 网络出版: 2012-05-22   

基于表面等离子体激发的光学操控技术

Dynamic Patterning of Microparticles via Surface Plasmon Excitation
作者单位
北京理工大学光电学院, 北京 100081
摘要
基于表面等离子体激发的光学操控技术由于其所需激光能量低、装置简单,近来引起了广泛关注。采用Kretschmann棱镜耦合法对金膜表面等离子体场进行激发,实现了对直径为10.8 μm的聚苯乙烯粒子的有效操控。通过引入一微孔阵列对入射激光光斑图样进行调制,实现了聚苯乙烯微粒在金膜表面的阵列式分布。实验中使用的光源为输出功率20 mW的氦氖激光器,所需要的能量密度仅为传统激光光镊能量密度的几十分之一。由于该装置成本低、操控灵活且较低的激光能量密度可以防止对活体细胞的破坏,因此,可在医疗领域中的活体细胞及DNA操控等方面得到应用。
Abstract
Optical manipulation based on surface plasmon excitation has recently attracted significant interest for its low energy consumption and simple installation. Surface plasmon field is excited with Kretschmann prism coupling scheme and effective trapping of 10.8 μm diameter polystyrene beads is realized. By modulating the incident laser pattern with a micro-aperture array, microparticles are massively dynamic patterned on a homogeneous gold thin film. A 20 mW He-Ne laser is used in the experiment as the light source. The applied power intensity is tens of times weaker than that of laser tweezers. Owing to its advantages such as low cost, flexible manipulation ability and low power consumption, the trapping method can be used to the manipulation of living cells and DNAs in medical treatments.
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张兵心, 陈淑芬, 付雷, 邹正峰, 孟彦彬. 基于表面等离子体激发的光学操控技术[J]. 中国激光, 2012, 39(6): 0610001. Zhang Bingxin, Chen Shufen, Fu Lei, Zou Zhengfeng, Meng Yanbin. Dynamic Patterning of Microparticles via Surface Plasmon Excitation[J]. Chinese Journal of Lasers, 2012, 39(6): 0610001.

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