Dynamic Manipulation by Light and Electric Fields: Micrometer Particles to Microliter Droplets

Aloke Kumar, Birck Nanotechnology Center, Purdue University, West Lafayette
Han-Sheng Chuang, Indiana University - Purdue University - Fort Wayne
Steven Wereley, Purdue University - Main Campus

Date of this Version


This document has been peer-reviewed.



We demonstrate a new hybrid optoelectric technique that can manipulate objects across several length scales. The technique leverages a variety of different physical mechanisms to achieve the dynamic manipuladon old roplets and also the in situ concentration of colloidal particles suspended in the droplets. Various physical mechanisms such as optoelectrowetting, electrothermal flows, and ac electroosmosis are leveraged through different modes of operation of the device. Each operational mode, which is activated through die proper combination of an applied ac bias and the illumination used, is characterized by the ability to manipulate objects on a certain length scale. We also demonstrate that the device lends itself to the active control of microstructure pattenis that emerge from a droplet evaporation process.


Engineering | Nanoscience and Nanotechnology