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arXiv 1111.1329physics.optics
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光阱中微粒自组装成稳定的环状结构

Self assembly of microparticles in stable ring structures in an optical trap

Arijit Haldar, Sambit Bikas Pal, Basudev Roy, S. Dutta Gupta, Ayan Banerjee

摘要:

在由高阶光束或全息图投影到捕获体积中产生的光学力的影响下的微粒自组装是众所周知的。在本文中,我们报告了一个环的相同的微球(每个直径为1.1 $μ$米)在传统的单光束光镊与通常的TEM $_{00}$高斯光束耦合到一个样品室具有驻波几何形状的盖玻片和载玻片的自发形成。不同的实验参数对环形成的影响进行了广泛的研究。实验观测得到了基于前向和后向传播高斯光束的平面波分解的理论模拟的支持。环形图案被证明是由于几何像差所产生的使用高数值孔径显微镜物镜聚焦到分层介质中的高斯光束。研究发现,分层介质的厚度和驻波几何形状本身在形成稳定的环形结构中起着关键作用。这些结构可用于光学结合的研究,以及光阱中细胞之间的生物相互作用。

英文摘要:

Micro-particle self assembly under the influence of optical forces produced by higher order optical beams or by projection of a hologram into the trapping volume is well known. In this paper, we report the spontaneous formation of a ring of identical microspheres (each with diameter 1.1 $μ$m) in conventional single beam optical tweezers with a usual TEM$_{00}$ Gaussian beam coupled into a sample chamber having standing wave geometry with a cover slip and glass slide. The effects of different experimental parameters on the ring formation are studied extensively. The experimental observations are backed by theoretical simulations based on a plane wave decomposition of the forward and backward propagating Gaussian beams. The ring patterns are shown to be caused due to geomterical aberrations produced by focusing the Gaussian beam using a high numerical aperture microscope objective into stratified media. It is found that the thickness of the stratified media and the standing wave geometry itself play a critical role in formation of stable ring structures. These structures could be used in the study of optical binding, as well as biological interactions between cells in an optical trap.

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