Research Paper

Microfluidics and Nanofluidics

, Volume 11, Issue 1, pp 93-104

First online:

Interaction of guided light in rib polymer waveguides with dielectrophoretically controlled nanoparticles

  • Aminuddin A. KayaniAffiliated withSchool of Electrical and Computer Engineering, RMIT University Email author 
  • , Adam F. ChrimesAffiliated withSchool of Electrical and Computer Engineering, RMIT University
  • , Khashayar KhoshmaneshAffiliated withCentre for Intelligent Systems Research, Deakin University
  • , Vijay SivanAffiliated withSchool of Electrical and Computer Engineering, RMIT University
  • , Eike ZellerAffiliated withSchool of Electrical and Computer Engineering, RMIT University
  • , Kourosh Kalantar-zadehAffiliated withSchool of Electrical and Computer Engineering, RMIT University Email author 
  • , Arnan MitchellAffiliated withSchool of Electrical and Computer Engineering, RMIT University

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Abstract

This work demonstrates an optofluidic system, where dielectrophoretically controlled suspended nanoparticles are used to manipulate the properties of an optical waveguide. This optofluidic device is composed of a multimode polymeric rib waveguide and a microfluidic channel as its upper cladding. This channel integrates dielectrophoretic (DEP) microelectrodes and is infiltrated with suspended silica and tungsten trioxide nanoparticles. By applying electrical signals with various intensities and frequencies to the DEP microelectrodes, the nanoparticles can be concentrated close to the waveguide surface significantly altering the optical properties in this region. Depending on the particle refractive indices, concentrations, positions and dimensions, the light remains confined or is scattered into the surrounding media in the microfluidic channel.

Keywords

Dielectrophoresis Microfluidics Nanoparticles Polymeric waveguide Tuneability