Light Induced Self Assembled Colloidal Systems

光诱导自组装胶体系统

• 批准号: EP/F025602/1
• 负责人: Kishan Dholakia
• 金额: $ 50.36万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF025602%2F1
• 关键词: Light; Induced; Self; Assembled; Colloidal

Light can move transparent objects at the microscopic scale. This occurs as the object may act like a small lens and bend the light and change its momentum. This causes the particle to be held in the brightest part of the light field. However interesting effects can occur if we use two opposing beams to hold a more than one particle: the very action of the light bent by one object influences the light distribution and thus equilibrium position of the other sphere creating a chain of objects held at distances of many microns from one another: optically bound matter. In systems with many microscopic particles other interesting effects may occur. If we illuminate a large group of such objects they naturally form patterns e.g. organise themselves into lines. For objects larger than the illuminating light, this occurs as each object acts like a lens and refocuses the light and pulls neigbouring objects together: This effect is intricately linked to nonlinear physics and this is a relatively new medium within which to observe phenomena such as solitons: waves that act like particles and in fact may move without any spreading. We aim to fully understand these effects and unfiy the understanding of optical binding and these nonlinear effects. We will realise optical binding in 2 and 3 dimensions as well as use a dye to image the light distribution in the system. The studies may lead to new ways to bind together cells, orgnaise colloidal particles over a large area and other objects creating self assembly of trapped objects to order. Such self assembly and understanding the reasons behind it is useful fora bottom up approach to creating larger crystals

光可以在微观尺度上移动透明物体。这是因为物体可能像一个小透镜一样，使光弯曲并改变其动量。这会使粒子保持在光场最亮的部分。然而，如果我们使用两个相对的光束来容纳一个以上的粒子，就会发生有趣的效果：一个物体弯曲的光的作用会影响光的分布，从而影响另一个球体的平衡位置，从而产生一系列彼此相距许多微米的物体：光学束缚物质。在具有许多微观粒子的系统中，可能会发生其他有趣的效应。如果我们照亮一大群这样的物体，它们自然会形成图案，例如组织成线条。对于比照明光大的物体，这是因为每个物体都像一个透镜一样，重新聚焦光线，并将相邻的物体拉在一起：这种效应与非线性物理学有着错综复杂的联系，这是一种相对较新的介质，可以观察到诸如孤子之类的现象：波的行为就像粒子，实际上可以移动而不会扩散。我们的目标是充分理解这些效应，并加深对光学束缚和这些非线性效应的理解。我们将实现2维和3维的光学结合，并使用染料对系统中的光分布进行成像。这些研究可能会带来新的方法来将细胞结合在一起，在大面积上组织胶体颗粒和其他物体，使被困物体按顺序进行自我组装。这种自组装和理解其背后的原因有助于自下而上的方法来创造更大的晶体