Takeo Nishikawa received master of science degree from the Graduate School of Engineering, Kyoto University, Japan, in 1999. He joined OMRON Corporation, Japan, in 1999 and developed micro-optical devices. Currently, he is supervisor of medical sensing development project, Core Technology Center of OMRON Corporation. From 2003 to 2005, he worked in the Graduate School of Frontier Bioscience, Osaka University, Japan, as an entrusted researcher. He is also the recepient of the NANO 50 award of 2008 for his research. At OMRON Corporation, he is currently developing a medical sensor based on the photonic detection system.