Electrowetting actuation of a dye-doped fluorescent droplet
We report tunable color output from a fluorescent dye-doped droplet actuated by electrowetting. The system design, based on a planar electrowetting set-up, is compact and straightforward, with minimal voltage requirements for effective actuation. Fluorescent droplets are sourced from a 1 mM solution of rhodamine 6G in distilled water. Initial contact angle for a dye-doped droplet is 72.1o.At a maximum applied voltage of 20 V, the contact angle decreases to 56.5o . Emission spectra are collected as the droplet fluoresces under UV illumination. Over an electrowetting voltage range of 0 to 20 V, the peak fluorescence wavelength shifts from 568 to 546 nm.
Guerrero, R. A., & Mero, R. D. C. (2014, November). Electrowetting actuation of a dye-doped fluorescent droplet. In Nanophotonics and Micro/Nano Optics II (Vol. 9277, p. 92771X). International Society for Optics and Photonics.