Electrokinetic patterning of colloidal particles with optical landscapes

Stuart J. Williams, Purdue University - Main Campus
Aloke Kumar, Purdue University - Main Campus
Steven T. Wereley, Birck Nanotechnology Center - Purdue University

Abstract

We demonstrate an opto-electrokinetic technique for noninvasive particle manipulation on the surface of a parallelplate indium tin oxide (ITO) electrode that is biased with an alternating current (AC) signal and illuminated with nearinfrared (1064 nm) optical landscapes. This technique can generate strong microfluidic vortices at higher AC frequencies (>100 kHz) and dynamically and rapidly aggregate and pattern particle groups at low frequencies (<100>kHz).

Discipline(s)

Nanoscience and Nanotechnology