Stefanus A Wirdatmadja, Michael Taynnan Barros, Yevgeni Koucheryavy, Josep Miquel Jornet, Sasitharan Balasubramaniam Wireless Optogenetic Nanonetworks for Brain Stimulation: Device Model and Charging Protocols IEEE Transactions on Nanobioscience 16 8 2017 10.1109/TNB.2017.2781150