Far-Field Plasmonic Resonance Enhanced Nano-Particle Image Velocimetry within a Micro Channel

TL;DR

This study introduces a novel nanoparticle-seeded PIV method utilizing far-field plasmonic resonance enhancement with silver nanoparticles to accurately measure velocity profiles in micro channels.

Contribution

It demonstrates the use of plasmonic resonance to enhance nanoparticle imaging for microfluidic velocity measurements, combining DDA calculations with experimental imaging.

Findings

Optimal scattering wavelengths identified for silver nanoparticles in water and air.

Plasmonic resonance enhances nanoparticle visibility in microchannel PIV.

Velocity profiles successfully measured using enhanced imaging techniques.

Abstract

In this paper, a novel far-field plasmonic resonance enhanced nanoparticle-seeded Particle Image Velocimetry (nPIV) has been demonstrated to measure the velocity profile in a micro channel. Chemically synthesized silver nanoparticles have been used to seed the flow in the micro channel. By using Discrete Dipole Approximation (DDA), plasmonic resonance enhanced light scattering has been calculated for spherical silver nanoparticles with diameters ranging from 15nm to 200nm. 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 PIV techniques, the velocity profile within the micro channel has been determined from the images.