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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

基本信息

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

项目摘要

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.

本项目的目标是创建一种新的方法，用于悬浮在液体中的微米级颗粒的选择性运动控制。该方法基于在某些结构中观察到的“回音壁”共振的光学对应物，其中在一个点发出的声音可以在某些其他特殊点清楚地听到，即使它在其他地方可能听不见。在这个项目中，一个悬浮的球形颗粒扮演着回音壁的角色，其共振由其直径和相对于周围液体的光学性质决定。波长与回音壁共振相匹配的激光将对颗粒施加显著的光学力，而即使直径略有不同的颗粒也不会受到影响。这允许基于尺寸和光学特性的极有选择性的颗粒操作和分离，从而使紧凑且坚固的微光流器件能够用于工业、医疗保健和环境应用。该项目将吸引本科院校戈登学院的学生参与最先进的合作研究，并推动以本科生为中心的研究基础设施的发展。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。该项目还将聘请来自主要研究型大学波士顿大学的研究生，他们将获得宝贵的教学和研究指导技能。该项目将研究利用光波导周围的渐逝光场对流场中携带的微粒施加力的分离方法。这些微粒具有回音壁模式共振，已知其强烈依赖于颗粒的形状和尺寸，确保了具有狭窄限定的几何特征的颗粒的前所未有的选择性。对力和流速的仔细控制允许设计颗粒轨迹，将选定的颗粒引导到储存器中以完成分离。为了提高吞吐量，将利用网络控制系统模型，并设计通信和控制策略，以利用单个驱动通道来同时引导不同特定尺寸的颗粒。该项目的方法有几个可取的方面：它具有精致和可调的选择性;它适用于固体颗粒以及悬浮液滴;它可以用于紧凑和强大的微光流体设备。这项工作将在几个方向上推进基础科学和工程。它将提供由于回音壁模式共振而产生的光推进力的详细参数研究，并有助于对该现象形成基本的理解。颗粒分离应用允许开发跨各个领域的有用技术，同时还提供了开发网络控制理论领域的设置。由于采用单个执行器来控制多个粒子的运动，因此这项工作需要网络控制理论的新应用，以及探索和解决该领域挑战的新领域。该研究还将推动实验流体动力学和光学科学的边界，从而导致微型光流体设备的制造和测试。