Collaborative Research: Dynamic Control and Separation of Microparticles in Fluids using Optical Whispering Gallery Mode Resonant Forces

合作研究：利用光学回音壁模式共振力动态控制和分离流体中的微粒

• 批准号: 1661586
• 负责人: Sean Andersson
• 金额: $ 33.21万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1661586&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamic; Control; Separation; Collaborative; Research; Dynamic; Control; Separation

The objective of this project is to create a new method for selective motion control of micrometer-sized particles suspended in liquids. The method is based on an optical counterpart to "whispering gallery" resonance observed in certain structures, in which a sound made at one point may be heard clearly in certain other special spots, even though it may be inaudible everywhere else. In this project, a suspended spherical particle plays the role of the whispering gallery, with the resonance determined by its diameter and optical properties relative to the surrounding liquid. Laser light with wavelength matched to the whispering gallery resonance will apply significant optical forces to the particle, while particles of even slightly different diameters will feel no effect. This allows extremely selective particle manipulation and separation based on size and optical characteristics, enabling compact and robust micro-opto-fluidic devices for use in industry, healthcare, and environmental applications. The project will engage students from Gordon College, an undergraduate institution, in state-of-the-art collaborative research and advance the growth of an undergraduate-focused research infrastructure. Gordon College undergraduates will develop hands-on expertise in optics, microfabrication, microfluidics, and control. The project will also engage graduate students from Boston University, a major research university, who will obtain valuable teaching and research mentoring skills.This project will investigate a method of separation using evanescent optical fields around an optical waveguide to exert forces on microparticles that are being carried in a flow field. These microparticles possess whispering gallery mode resonances that are known to be strongly dependent on the shape and size of the particles, ensuring an unprecedented selectivity of particles with narrowly defined geometric characteristics. Careful control of the forces and flow velocities allows for the design of particle trajectories, directing the selected ones into reservoirs to accomplish separation. To increase throughput, a networked control system model will be leveraged and communication and control policies designed that leverage the single actuation channel to simultaneously steer particles of different specific sizes. The project's approach has several desirable aspects: it has exquisite and tunable selectivity; it is applicable to solid particles as well as suspended liquid droplets; and it can be used in a compact and robust micro-opto-fluidic device. This work will advance fundamental science and engineering in several directions. It will provide detailed parametric study of the light propelling forces due to whispering gallery mode resonances and help to develop a fundamental understanding of the phenomenon. The particle separation application allows for the development of technology useful across various fields while also providing a setting to develop the field of networked control theory. Because a single actuator is employed to control the movement of multiple particles, this work requires a novel application of networked control theory and a new domain for exploring and resolving challenges in this field. The research will also push the boundaries in experimental fluid dynamics and optical science leading to the fabrication and test of a micro-opto-fluidic device.

该项目的目的是创建一种新方法，以选择悬浮在液体中的微米大小的颗粒的选择性运动控制。该方法基于光学对应物，以在某些结构中观察到“窃窃私图库”的共鸣，在某些其他特殊景点中，在某些其他特殊景点中可能会清楚地听到声音，即使在其他任何地方都可能无法清楚地听到。在这个项目中，悬浮的球形粒子扮演了耳语画廊的作用，其共振取决于其直径和光学特性相对于周围液体的谐音。波长与耳语画廊共振相匹配的激光光将对粒子施加重要的光学作用，而直径略有不同的颗粒将没有效果。这允许基于尺寸和光学特性的极高选择性的粒子操纵和分离，从而实现紧凑而健壮的微型富富富富型设备，用于行业，医疗保健和环境应用。该项目将吸引本科机构戈登学院的学生参与最先进的协作研究，并促进以本科研究为中心的研究基础设施的增长。戈登学院的本科生将在光学，微加工，微流体和控制方面发展实践专业知识。该项目还将吸引来自波士顿大学的研究生，该大学将获得有价值的教学和研究指导技能。本项目将使用光学波导周围的evaneascent光学领域进行分离方法，以在流动领域携带的微粒上施加力。这些微粒具有窃窃库模式的共振，已知在很大程度上取决于颗粒的形状和大小，从而确保了具有狭义定义的几何特征的颗粒的前所未有的选择性。仔细控制力和流速度可以设计颗粒轨迹，将选定的轨迹引导到储层中以完成分离。为了增加吞吐量，将利用网络控制系统模型，并设计与单个驱动通道的通信和控制策略同时引导具有不同特定尺寸的粒子。该项目的方法具有几个理想的方面：它具有精致且可调的选择性；它适用于固体颗粒以及悬浮的液滴；它可以用于紧凑而健壮的微型富富型装置。这项工作将沿多个方向推进基本科学和工程。它将由于耳语画廊模式共振引起的光推动力提供详细的参数研究，并有助于发展对现象的基本理解。 粒子分离应用程序允许开发在各个领域有用的技术，同时还提供了开发网络控制理论领域的设置。由于使用单个执行器来控制多个粒子的运动，因此这项工作需要对网络控制理论的新颖应用，以及一个新的领域，用于探索和解决该领域的挑战。这项研究还将在实验流体动力学和光学科学中的边界，从而导致微观富富型装置的制造和测试。