Affiliation: | (1) Department of Physics, Niigata University, 950-2181 Niigata, Japan;(2) School of Medicine, Niigata University, 951 Niigata, Japan;(3) Department of Biology, Niigata University, 950-2181 Niigata, Japan;(4) Present address: Nortel Institute Laboratory for Optoelectronics, University of Toronto, 10 King's College Road, M5S 1A4 Toronto, ON, Canada |