Planar microelectrode arrays
We've developed high-density microelectrode arrays for the recording of extracellular signals from retinal tissue. This system is state-of-the-art. It's being used to study retinal processing and encoding of dynamic visual images at the Salk Institute in San Diego and retinal development in the mouse at the University of California Santa Cruz.
This research has resulted in a recent Nature publication (doi:10.1038/nature09424) where the system was used to study colour processing in the retina. It required close collaboration between the neurophotonics group and teams at the University of California Santa Cruz (Litke & Sher), the Salk Institute (Chichilnisky) and AGH University, Krakow (Dabrowski & Hottowy).
Above: A 519-elctrode fabricated in Indium Tin Oxide (ITO) using electron-beam lithography and plasma etching. Each eletrode is sapced at 30 microns and measures 5 microns in diameter. The electrode array is optically transparent except for the microelectrodes themselves, which are formed from platinum black.