Light Actuation of Liquid by Optoelectrowetting
Abstract
Optical actuation of liquid droplets has been experimentally demonstrated for the first time using a novel optoelectrowetting (OEW) principle. The optoelectrowetting surface is realized by integrating a photoconductive material underneath a two-dimensional array of electrowetting electrodes. Contact angle change as large as 30 degrees has been achieved when illuminated by a light beam with an intensity of 65 mW/sq cm. A micro-liter droplet of deionized water has been successfully transported by a 4 mW laser beam across a 1 cm x 1 cm OEW surface. The droplet speed is measured to be 7 mm/s. Light actuation enables complex microfluidic functions to be performed on a single chip without encountering the wiring bottleneck of two-dimensional array of electrowetting electrodes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2005
- Accession Number
- ADA471598
Entities
People
- Chang-jin Kim
- Hiroshi Toshiyoshi
- Hyejin Moon
- Ming C. Wu
- Pei Y. Chiou
Organizations
- University of California, Los Angeles