Abstract
Surface-plasmon-resonance (SPR) sensors are widely used in biological, chemical, medical, and environmental sensing. SPR sensors supporting two surface-plasmon modes can differentiate surface binding interactions from bulk index changes at a single sensing location. We present a new approach to dual-mode SPR sensing that offers improved differentiation between surface and bulk effects. By using an angular interrogation, both long- and short-range surface plasmons are simultaneously excited at the same location and wavelength but at different angles. Initial experiments indicate that angular interrogation offers at least a factor of 3.6 improvement in surface and bulk cross-sensitivity compared to wavelength-interrogated dual-mode SPR sensors.
© 2008 Optical Society of America
Full Article | PDF ArticleMore Like This
J. T. Hastings, J. Guo, P. D. Keathley, P. B. Kumaresh, Y. Wei, S. Law, and L. G. Bachas
Opt. Express 15(26) 17661-17672 (2007)
Mohamad Diaa Baiad, Mathieu Gagné, Wendy-Julie Madore, Etienne De Montigny, Nicolas Godbout, Caroline Boudoux, and Raman Kashyap
Opt. Lett. 38(22) 4911-4914 (2013)
A. Shalabney and I. Abdulhalim
Opt. Lett. 37(7) 1175-1177 (2012)