微通道内远场等离子体共振增强的纳米颗粒图像测速技术

Far-field plasmonic resonance enhanced nanoparticle image velocimetry within a microchannel.

作者信息

Zhang Zhili, Li Quanshui, Haque Sara S, Zhang Mingjun

机构信息

Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA.

出版信息

Rev Sci Instrum. 2011 Feb;82(2):023117. doi: 10.1063/1.3555341.

DOI:10.1063/1.3555341

PMID:21361583

Abstract

In this paper, a novel far-field plasmonic resonance enhanced nanoparticle-seeded particle image velocimetry has been demonstrated to measure the velocity profile in a microchannel. Chemically synthesized silver nanoparticles have been used to seed the flow in the microchannel. By using discrete dipole approximation, plasmonic resonance enhanced light scattering has been calculated for spherical silver nanoparticles with diameters ranging from 15 to 200 nm. Optimum scattering wavelength is specified for the nanoparticles in two media: water and air. The diffraction-limited plasmonic resonance enhanced images of silver nanoparticles at different diameters have been recorded and analyzed. By using standard particle image velocimetry techniques, the velocity profile within the microchannel has been determined from the images.

摘要

在本文中，一种新型的远场等离子体共振增强纳米粒子种子粒子图像测速技术已被证明可用于测量微通道中的速度分布。化学合成的银纳米粒子已被用于在微通道中播种流体。通过使用离散偶极近似法，已计算出直径范围为15至200nm的球形银纳米粒子的等离子体共振增强光散射。针对水和空气这两种介质中的纳米粒子，确定了最佳散射波长。已记录并分析了不同直径的银纳米粒子的衍射极限等离子体共振增强图像。通过使用标准的粒子图像测速技术，已从这些图像中确定了微通道内的速度分布。