Read A multimodal micro-optrode – a blog post in openoptogenetics about the multimodal micro-optrodes developed by Yoann Lechasseur, Suzie Dufour and the rest of the YDK lab team and collaborators:

http://openoptogeneticsblog.org/?p=550

The post discusses two papers

• A microprobe for parallel optical and electrical recordings from single neurons in vivo Nature Methods 8, 319–325 (2011) doi:10.1038/nmeth.1572
  by Yoan LeChasseur, Suzie Dufour, Guillaume Lavertu, Cyril Bories, Martin Deschênes, Réal Vallée & Yves De Koninck
• http://www.nature.com/nmeth/journal/v8/n4/full/nmeth.1572.html
• A Multimodal Micro-Optrode Combining Field and Single Unit Recording, Multispectral Detection and Photolabeling Capabilities PLOS one
  by Suzie Dufour, Guillaume Lavertu, Sophie Dufour-Beauséjour, Alexandre Juneau-Fecteau, Nicole Calakos, Martin Deschênes, Réal Vallée, Yves De Koninck
  http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0057703