1 Sensors and Actuators A 189 (2013) 474-480 A Biosensor based on Periodic Arrays of Gold Nanodisks under Normal Transmission Hao Jiang, Tingjie Li, Erden Ertorer, Jun Yang, Jayshri Sabarinathan and Silvia Mittler* Hao Jiang, Department of Electrical and Computer Engineering, the University of Western Ontario, London, ON N6A 5B9, Canada Tingjie Li, Department of Mechanical and Materials Engineering, the University of Western Ontario, London, ON N6A 5B9, Canada Erden Ertorer, Department of Physics and Astronomy, the University of Western Ontario, London, ON N6A 5B9, Canada Jun Yang, Department of Mechanical and Materials Engineering, the University of Western Ontario, London, ON N6A 5B9, Canada Jayshri Sabarinathan, Department of Electrical and Computer Engineering, the University of Western Ontario, London, ON N6A 5B9, Canada Silvia Mittler, Department of Physics and Astronomy, the University of Western Ontario, London, ON N6A 5B9, Canada Corresponding author: Silvia Mittler, email: smittler@uwo.ca, tel: 519-661-2111 ext. 88592.